Oral Rehydration Salts: The Complete Supplement Guide

Quick Reference Card

Overview

The Basics

Oral rehydration salts are one of the simplest medical formulas ever developed and one of the most effective. They are not just "electrolytes." They are a specific balance of sodium, glucose, potassium, chloride, and base precursor designed to help your small intestine pull water back into your body when you are losing it through diarrhea, vomiting, fever, heat, or certain gastrointestinal conditions [1][2].

What makes ORS notable is that it solves a very specific problem. When people are dehydrated from diarrhea or vomiting, plain water can be inadequate. It replaces fluid but not the right electrolyte balance, and in some cases it can even worsen dilutional problems if losses are ongoing. ORS works better because the glucose and sodium are there on purpose, in a ratio that improves absorption rather than just flavor [1][3].

The strongest evidence for ORS is not in casual wellness culture. It is in acute gastroenteritis, diarrheal disease, and other high-loss settings. This is why clinicians, travel medicine resources, and GI-care teams still rely on it. Community discussion lines up with that. People who use ORS because they have a real fluid-and-electrolyte problem often describe it as highly effective. People using it as a trendy daily hydration ritual are much more skeptical [2][3][4].

The Science

ORS emerged from the discovery that sodium-glucose co-transport in the small intestine remains functional even during many secretory diarrheal illnesses. That matters because it means a properly formulated glucose-electrolyte solution can still drive sodium and water absorption despite active fluid loss. This mechanism transformed diarrhea care globally and helped move dehydration treatment away from a hospital-only intravenous model for many mild-to-moderate cases [1][2].

The modern WHO low-osmolarity formula is built around 75 mmol/L sodium and 75 mmol/L glucose, with potassium, chloride, and citrate completing the electrolyte profile for a total osmolarity of 245 mOsm/L [1][5]. This lower-osmolarity design improved on the older WHO standard by reducing the need for rescue intravenous therapy and lowering vomiting and stool volume in non-cholera pediatric diarrhea trials and meta-analyses [5][6].

ORS should be thought of as a formula class rather than a single retail product. Some commercial products are close to the WHO style, some are diluted or sweetened consumer variants, and some specialized formulas are deliberately different for specific conditions. That is why "oral rehydration salts" can mean very different things on a pharmacy shelf, even when the package language sounds similar [1][9][10].

Chemical & Nutritional Identity

The standard WHO-style reduced-osmolarity ORS formula is a multi-solute product rather than a single compound. A typical one-liter formulation is built from the component substances below [1][5][13]:

The standard reduced-osmolarity WHO-style formula provides approximately:

• sodium 75 mmol/L
• glucose 75 mmol/L
• potassium 20 mmol/L
• chloride 65 mmol/L
• citrate 10 mmol/L
• total osmolarity 245 mOsm/L [1][5]

Mechanism of Action

The Basics

The key idea is simple: sodium helps your body hold onto water, but sodium works much better in the gut when glucose is beside it. ORS uses this on purpose. When you drink a properly mixed ORS, your intestine takes up glucose and sodium together, and water follows that movement. That is why ORS works better than plain water when you are losing fluid quickly from diarrhea or vomiting [1][2].

This also explains why sugar-free "electrolyte water" is not automatically the same thing as ORS. In illness-related dehydration, the glucose is not there just for taste or calories. It is part of the transport logic. Too much sugar can create its own absorption problem, but the right amount improves uptake [1][4].

Potassium, chloride, and citrate round out the formula. They help replace electrolytes commonly lost in stool and vomit and help stabilize acid-base balance. The formula is meant to restore usable fluid volume, not just replace one mineral in isolation [1][5].

The Science

CDC's gastroenteritis guidance emphasizes that sodium-coupled glucose co-transport remains intact in many secretory diarrheal illnesses. The luminal transporter SGLT1 brings sodium and glucose into the enterocyte together, while the basolateral Na+/K+ ATPase maintains the electrochemical gradient that makes this possible. Water then follows the osmotic gradient created by active solute transport [2].

This mechanism is why ORS stays effective even when chloride secretion is high and stool losses are large. The discovery that secretory diarrhea did not destroy this absorptive pathway is what made modern oral rehydration therapy possible. In practical terms, ORS is a physiologic transport solution, not just a flavored salt drink [1][2].

The lower-osmolarity formula matters because absorption is not only about ingredients but also about concentration. A solution that is too concentrated, especially in sugar, can slow gastric emptying or worsen osmotic losses. Reduced-osmolarity ORS was developed to improve this balance, which is one reason it outperformed the older WHO formula in non-cholera pediatric diarrhea studies [5][6].

Absorption & Bioavailability

The Basics

ORS is intentionally designed for absorption, which makes this section more important than it looks. A correctly mixed packet is not just a convenience. The sodium, glucose, and overall osmolality are tuned so the intestine can absorb water efficiently during dehydration. If you over-concentrate it by using too little water, you can make the drink harder to tolerate and less useful. If you dilute it too much, you lower the very sodium and glucose concentration that gives ORS its edge [1][2][5].

Ready-to-drink oral electrolyte solutions remove the mixing variable, while sachets make it easier to travel with exact ingredients. Community feedback suggests that lightly flavored or plain versions tend to be better tolerated by people already nauseated, but the core benefit still comes from the formula itself, not the flavoring [3][4].

The absorption window is fast. ORS is not like a supplement that needs weeks to build up. Once tolerated in the gut, its effect begins during the same illness episode or hydration window in which you drink it.

The Science

The WHO-style reduced-osmolarity formula clusters around 245 mOsm/L, which is lower than the older WHO standard and better aligned with efficient intestinal absorption in non-cholera diarrheal illness [1][5][6]. The 2025 pediatric review reiterates that low-osmolality ORS provides an effective electrolyte-glucose balance for water absorption across gastroenteritis causes and can even be used via nasogastric tube in selected patients who cannot take enough by mouth [4].

Commercial variability is a real concern. Products sold under the broad "electrolyte" umbrella may not match WHO-style ORS concentration or intent. For illness-related dehydration, it is better to look for products explicitly marketed as oral rehydration solutions or oral electrolyte solutions with clear reconstitution instructions than to assume any hydration packet is equivalent [3][10].

Knowing why a formula works is useful, but being able to see how your own intake patterns line up with symptoms is what makes that knowledge usable. Doserly lets you log when you used an ORS packet, how much water you mixed it with, and whether it was during diarrhea, heat exposure, travel, or another high-loss situation, so your notes are anchored to the context that actually matters.

The app also makes it easier to compare forms. If one ready-to-drink product sits well while another flavored packet worsens nausea, or if one dilution works better than another for your stomach, that history stays attached to the event instead of living in memory. Over time, the pattern becomes obvious.

Research & Clinical Evidence

Acute Gastroenteritis and Non-Cholera Diarrhea

The Basics

This is where ORS earns its reputation. In mild-to-moderate dehydration from diarrhea, it is one of the most evidence-based interventions available. It works well enough that many patients can avoid intravenous fluids entirely if they start early and can keep the solution down [2][4][6].

The strongest message from the literature is not that ORS instantly stops diarrhea. It is that it helps people stay hydrated, reduces the need to escalate to IV therapy, and often reduces vomiting and stool volume compared with the older higher-osmolarity formula [5][6].

The Science

In the multicenter randomized trial of 675 children with acute watery diarrhea and dehydration, reduced-osmolarity ORS lowered unscheduled IV therapy use from 15% to 10% versus the older WHO formula, while maintaining similar overall illness duration [5]. The systematic review pooling 15 randomized trials found reduced-osmolarity ORS was associated with fewer unscheduled IV infusions, lower stool output, and less vomiting, without a statistically significant overall increase in hyponatremia [6].

These data are the main reason the lower-osmolarity formulation replaced the older WHO standard in routine non-cholera diarrheal care [1][6].

Cholera and Very High-Volume Secretory Diarrhea

The Basics

ORS is still important in cholera, but this is the setting where the confidence around the low-osmolarity formula becomes less straightforward. Cholera can produce extreme sodium and fluid losses, which means the balance between effective rehydration and biochemical hyponatremia deserves more caution [7].

In plain language, ORS remains part of treatment, but clinicians need to watch the situation more closely, and severe cases often need intravenous therapy first.

The Science

The cholera-focused systematic review found that ORS formulas at or below 270 mOsm/L were associated with more biochemical hyponatremia than higher-osmolarity ORS in pooled cholera trials, even though major clinical outcomes such as unscheduled IV infusion did not clearly worsen and no symptomatic hyponatremia or deaths were reported in the included studies [7].

This does not overturn the value of reduced-osmolarity ORS in ordinary diarrheal illness. It does mean the cholera setting should not be treated as identical to non-cholera gastroenteritis.

Heat, Exercise, and Non-Illness Dehydration

The Basics

ORS can be useful outside infectious diarrhea, but the evidence is not equally strong in every setting. For people who are sweating heavily, working in heat, or repeatedly getting dehydrated during travel, an ORS-style product can make sense. For ordinary short workouts or routine desk-job hydration, it is often more formula than you need [3][4].

That split also appears in community discussion. People using ORS because they are actually volume depleted speak positively about it. People using it as premium flavored water are much more likely to call it unnecessary.

The Science

The 2025 review notes that ORS principles are relevant beyond gastroenteritis, including hot environments and exercise-related fluid loss, but the research base remains thinner and more heterogeneous than the pediatric diarrhea literature [4]. That means claims about universal athletic superiority should stay modest. ORS is best supported as a rehydration tool, not a universal performance enhancer.

High-Output Stoma and Intestinal Failure Contexts

The Basics

This is a specialized but important use case. People with high-output stoma, short bowel syndrome, or similar intestinal-failure problems often lose fluid in a way that makes plain water unexpectedly unhelpful. In that setting, specially designed oral rehydration solutions can be part of day-to-day fluid management [9].

The Science

Imperial College Healthcare NHS describes St Mark's solution as a low-cost home glucose-electrolyte mix for short bowel and high stoma output, with a potassium-free higher-sodium design and advice to limit ordinary hypotonic fluids that can worsen output [9]. This is a different evidence and practice lane from OTC ORS packets, but it matters because many readers searching for ORS are actually dealing with chronic GI fluid-loss problems, not just a stomach bug.

Evidence & Effectiveness Matrix

Benefits & Potential Effects

The Basics

The main benefit of oral rehydration salts is not mysterious. They help replace fluid and electrolytes more effectively than plain water when dehydration is being driven by diarrhea, vomiting, high stool output, or similar fluid-loss problems. That is the benefit with the strongest real-world and evidence support [1][2][3].

For people with mild-to-moderate dehydration, ORS can reduce the chance that the situation escalates to intravenous treatment. It can also reduce vomiting and stool losses compared with older higher-osmolarity formulas. That does not mean it cures the infection or underlying cause. It means it helps keep the body stable while the illness resolves or further care is arranged [5][6].

There is also a practical benefit that community users highlight clearly: ORS can improve how quickly someone feels able to function again. Less dizziness, less headache, less "I can't get off the couch" dehydration feeling. That benefit is real, but it is conditional on actually being dehydrated in the first place.

The Science

WHO, CDC, and PubMed sources all support ORS as a front-line intervention for mild-to-moderate dehydration related to acute gastroenteritis [1][2][4]. The reduced-osmolarity trial and systematic review show the most concrete measurable wins in non-cholera pediatric diarrhea: lower IV rescue use, less vomiting, and lower stool output [5][6].

Potential benefits outside acute GI illness are more selective. In heat, travel, dysautonomia, or chronic GI-loss settings, ORS may support plasma volume and symptom control, but the evidence is less standardized and more use-case specific [4][9]. That is why ORS should be framed as targeted support, not as a universal daily-performance upgrade.

Side Effects & Safety

The Basics

ORS is usually safe when used the way it is intended, but safe does not mean thoughtless. The biggest risks come from the wrong formula, the wrong concentration, or the wrong situation.

If you mix too little water into a powder, the drink may become too concentrated and harder to tolerate. If you use plain water alone when losses are heavy, you may not replace sodium appropriately. If you keep trying ORS while someone cannot keep fluids down, becomes confused, looks severely dehydrated, or stops urinating, that is not a supplement problem anymore. That is a medical-care problem [2][4][8].

People with significant kidney disease, some heart conditions, major fluid restrictions, or medications that alter potassium or sodium handling should be more careful. The sugar content of standard ORS also matters for people with diabetes or anyone monitoring glucose closely [4][10].

The Science

The strongest formal safety tension in the literature is the one between non-cholera and cholera settings. In non-cholera pediatric diarrhea, reduced-osmolarity ORS improved several clinically important outcomes without showing a significant pooled increase in hyponatremia [5][6]. In cholera, however, the systematic review found more biochemical hyponatremia with lower-osmolarity formulas, even though severe clinical consequences were not clearly increased in the small trials reviewed [7].

Other practical safety issues are simpler. Ready-to-drink products can have substantial sugar. DIY formulas can be mismeasured. Specialty formulas like St Mark's are for a different clinical context and should not be copied casually just because they appear online [9].

Dosing & Usage Protocols

The Basics

ORS works best when it is mixed exactly as directed and taken in small repeated amounts rather than in one huge bolus. That sounds basic, but it is where many mistakes happen.

For mild-to-moderate dehydration, common clinical protocols use roughly 50-100 mL/kg over 3-4 hours, then continue replacing ongoing losses as needed [2][4]. For people who are vomiting, smaller and slower is usually better. Sipping every minute or two is often more successful than trying to gulp a full glass at once.

In adults using ORS for travel illness, fever, or heat-related fluid loss, the right dose is usually less about a magic daily number and more about matching ongoing losses while watching tolerance, urine output, thirst, and symptom improvement. Commercial packets should be mixed into the exact labeled water volume. Ready-to-drink bottles should be used according to label directions.

The Science

CDC and review-based guidance support rapid oral rehydration in mild-to-moderate dehydration with continued monitoring for improvement and escalation when oral therapy fails [2][4]. Reduced-osmolarity ORS is the best-supported formula for routine non-cholera diarrheal dehydration [1][5][6].

Specialized protocols differ. St Mark's solution uses 20 g glucose, 3.5 g sodium chloride, and 2.5 g sodium bicarbonate or sodium citrate in 1 liter of water, with no potassium, for high-output stoma and intestinal-failure settings [9]. This is not a substitute for standard WHO-style ORS in ordinary gastroenteritis.

Getting the dose right matters because ORS is one of the few products where small concentration errors can change how it behaves. Doserly gives you a clean record of which product you used, how you mixed it, how often you drank it, and whether the symptoms you were targeting actually improved.

That is especially useful when your hydration needs change by context. A travel packet used during foodborne illness, a ready-to-drink bottle used after heat exposure, and a clinician-directed rehydration routine during GI flare all look similar in memory a week later. Logged properly, they stop blurring together and start becoming usable personal evidence.

What to Expect (Timeline)

Oral rehydration salts work on an acute timeline, not a cumulative supplement timeline.

First 15-30 minutes: If the solution is tolerated, absorption begins quickly. Thirst may ease, and the urge to keep chasing plain water often settles down.

First 1-4 hours: In mild-to-moderate dehydration, this is the window where ORS should start improving dizziness, headache, weakness, and urine concentration if the fluid-loss source is slowing and the person is absorbing what they drink [2][4].

Same day: Many people notice that ORS helps them feel more stable and functional during the same illness episode or heat-exposure window. Community reports of benefit usually land here, not weeks later.

24 hours: If diarrhea or vomiting is ongoing, ORS often remains useful, but this is also where clinical reassessment matters. Persistent vomiting, worsening lethargy, poor urine output, severe weakness, or inability to keep fluids down are signs that home oral therapy may be failing [4][8].

Chronic GI-loss settings: In high-output stoma or short-bowel contexts, oral rehydration can become an everyday management tool rather than a short rescue measure. Here the timeline is less "rapid fix" and more "maintaining fluid balance throughout the day" [9].

Interactions & Compatibility

Synergistic

• Sodium/Electrolyte Formulas: Useful adjacent guide for readers comparing ORS with broader sodium-focused hydration products.
• Electrolyte Powders/Tablets: Helpful comparison guide for sport-style formulas that may not be appropriate substitutes during diarrheal illness.
• Potassium: Relevant because potassium replacement is part of standard ORS design and because kidney-risk contexts can change safe use.
• Magnesium: Not required in standard WHO ORS, but often discussed alongside broader hydration formulas and cramp-prevention protocols.
• Zinc: Often paired with pediatric diarrhea care in public-health settings, though zinc is a separate intervention from ORS itself.

Caution / Avoid

• ACE inhibitors, ARBs, and potassium-sparing diuretics: These can increase potassium retention. Standard ORS usually contains less potassium than therapeutic K supplements, but repeated use still deserves caution in high-risk patients.
• Advanced kidney disease: Sodium, potassium, and fluid handling may be impaired, so ORS should not be treated casually.
• Lithium: Major changes in sodium intake can alter lithium handling.
• Strict fluid restrictions or heart-failure management plans: Any oral rehydration protocol should fit the underlying clinical plan.
• Very high-sugar sports drinks used as "ORS substitutes": These may not match the absorption intent of true ORS and can be a poor fit in illness-related dehydration [3].

How to Take / Administration Guide

Use the exact amount of water stated on the label. Do not guess. ORS is one of the rare supplement-adjacent products where "eyeballing it" can defeat the purpose.

For nausea or vomiting: Start with very small sips. If larger gulps trigger vomiting, use teaspoon-sized amounts every minute or two and build up gradually as tolerated [4].

For powder sachets: Empty the full packet into the intended water volume. Mixing half-packets or random concentrations is where a lot of DIY errors start.

For ready-to-drink products: Use them as packaged and pay attention to label storage instructions after opening.

For homemade specialty formulas: Only use recipes like St Mark's solution when you actually fit the clinical use case or have been told to do so by a clinician or dietitian [9].

For children: Use age-appropriate products or dosing instructions and escalate sooner if the child becomes sleepy, stops urinating, cries without tears, or cannot keep fluid down [4][8].

The details above only help if they become something you can follow under stress. Doserly turns that into a usable routine, whether that means a travel checklist with ORS packets, a GI-flare protocol with reminder intervals for small sips, or a simple record of which formula and dilution you tolerated best.

It is also useful when hydration is part of a bigger stack or care routine. If you are spacing ORS away from medications, tracking illness episodes, or trying to remember what actually worked during your last flare or travel bug, the app keeps the protocol visible instead of forcing you to reconstruct it afterward.

Choosing a Quality Product

Look for products that clearly state:

• exact sodium, potassium, glucose, and osmolality or total carbohydrate content
• the full reconstitution volume
• whether the product is intended as an oral rehydration solution or just a general electrolyte drink
• storage instructions after mixing or opening

Green flags:

• formula logic that stays close to WHO-style reduced-osmolarity ORS for illness-oriented use
• plain or lightly flavored options if nausea is an issue
• clear labeling for children versus adults
• lot-based quality transparency if the product is aimed at athletes or medical-adjacent use

Red flags:

• "electrolyte" branding without enough sodium or without a meaningful glucose component for illness rehydration
• unclear or tiny serving sizes that make real rehydration impractical
• heavy use of trendy sweeteners and extras while hiding the actual core electrolyte numbers
• products marketed as ORS but positioned mainly around fitness lifestyle claims rather than rehydration specifics

For athletes, third-party certification still matters even though standard ORS ingredients are not prohibited. Quality programs such as NSF Certified for Sport or Informed Sport lower contamination risk but do not eliminate it entirely [11][12].

Storage & Handling

• Keep powders sealed, dry, and away from humidity.
• Store ready-to-drink bottles according to label instructions.
• Refrigerate opened products if the package directs it.
• Discard reconstituted or homemade solutions after 24 hours unless the label states otherwise [9].
• Do not keep an old mixed bottle in a bag for multiple days "just in case."
• If a powder has clumped badly, smells off, or has unclear labeling, replace it rather than guessing.

Lifestyle & Supporting Factors

ORS works best when it is part of a bigger hydration strategy rather than a substitute for judgment.

If diarrhea, vomiting, fever, heat exposure, or travel is the issue:

• keep total fluid intake steady rather than binge-drinking after you already feel awful
• watch urine output and mental status, not just thirst
• restart ordinary food as tolerated if illness guidance says you can [2][4]
• use plain water, broths, or food alongside ORS as the situation allows, not instead of it

If you have a chronic GI-loss condition:

• remember that specialty advice may differ from standard diarrhea care
• ordinary hypotonic drinks may sometimes worsen output in intestinal-failure settings [9]
• clinician guidance matters more than generic hydration marketing

If you are healthy and using ORS casually:

• question whether you need a therapeutic rehydration formula at all
• consider whether plain water, diet, and ordinary electrolyte intake are already adequate
• treat ORS as a tool for specific situations, not a default wellness badge

Regulatory Status & Standards

In the public-health and clinical literature, ORS is treated as a standardized oral rehydration therapy formula rather than a vague lifestyle beverage. WHO and UNICEF maintain the best-known international benchmark through the reduced-osmolarity ORS formulation [1].

United States: CDC explicitly recommends oral rehydration solutions for severe diarrhea-related fluid loss and distinguishes them from sports drinks, which it says do not replace diarrheal losses correctly [3]. Consumer products in the United States appear under more than one regulatory and marketing framework depending on formulation and claims, so labels and intended use should be read closely.

Canada: Health Canada's natural-health-product database shows marketed oral electrolyte products with NPN licensing, explicit dosing instructions, and warning language for dehydration-related use cases [10].

European Union: This research pass did not confirm a single finished-product pathway that captures all ORS-type consumer products across EU markets. Country-level pharmacy, food, and medical-use positioning may vary.

Australia: This research pass did not confirm a single current TGA endpoint covering all ORS consumer products. As in other jurisdictions, product classification depends on formulation and claims.

Athlete and sports status: WADA states that the 2026 Prohibited List is in force as of January 1, 2026, and standard ORS ingredients are not named as prohibited substances [11]. USADA still advises athletes to verify medication status with GlobalDRO and to remain cautious with supplements because contamination, not sodium or glucose itself, is the main practical anti-doping risk [12].

Regulatory status and product classification can change. Athletes and medically complex users should verify the current status of any product they plan to use.

Frequently Asked Questions

Is ORS the same thing as a sports drink?No. Sports drinks and ORS overlap, but they are not the same category. CDC explicitly states that sports drinks do not replace diarrheal losses correctly and should not be used as the treatment standard for diarrheal illness [3].

Does the sugar in ORS actually matter?Yes. In true ORS, glucose is part of the absorption mechanism, not just flavor. That does not mean more sugar is better. The point is the right amount in the right formula [1][2][4].

Can I use ORS every day?You can, but that does not mean you should. ORS makes the most sense when you have a real fluid-and-electrolyte problem to solve. Routine daily use in healthy, normally hydrated adults has much weaker evidence [4].

Can I make ORS at home?Only if you follow a trustworthy recipe exactly. DIY is popular, but inaccurate mixing is one of the easiest ways to undermine the formula. Specialized recipes such as St Mark's solution are for different clinical contexts and are not interchangeable with standard WHO-style ORS [9].

How long does mixed ORS last?Homemade and freshly mixed solutions should generally be discarded after 24 hours unless the product label says otherwise [9].

Is ORS safe if I have diabetes?Not automatically unsafe, but the glucose content matters and should be considered in context. People with diabetes or strict glucose targets should use products thoughtfully and ask their clinician if repeated ORS use is needed [4][10].

When should I stop trying ORS and seek medical care?If someone cannot keep fluids down, becomes confused, urinates very little, looks severely dehydrated, or continues worsening despite oral therapy, that moves beyond self-care [2][4][8].

Can ORS help with exercise and heat?Sometimes, yes. It can be useful when losses are large, but it is usually more formula than needed for an ordinary short workout. The evidence is strongest for GI-loss dehydration, not casual gym use [3][4].

Are all ORS packets close to the WHO formula?No. Some are close. Others are consumer-friendly hydration products with a very different sugar, sodium, or flavor profile. Read the label rather than trusting the front-of-pack language.

Myth vs. Fact

Myth: ORS is just fancy salty water.Fact: Proper ORS depends on sodium, glucose, and overall osmolality working together. That is why it outperforms plain water in many dehydration settings [1][2].

Myth: Sugar-free electrolyte mixes do the exact same job as ORS.Fact: Sugar-free mixes may help in some hydration contexts, but standard ORS uses glucose as part of the intestinal transport mechanism. They are not automatically interchangeable [1][4].

Myth: If ORS is good for diarrhea, more concentrated ORS must be even better.Fact: Over-concentrating a formula can make it less tolerable and less physiologically appropriate. Exact mixing matters [1][5].

Myth: ORS stops the infection that caused diarrhea.Fact: ORS treats dehydration and helps stabilize the body. It does not directly cure the infection itself [2][4].

Myth: ORS is the best hydration drink for everyone every day.Fact: ORS is best understood as a targeted rehydration tool. Many healthy people on ordinary days do not need it [3][4].

Myth: Every product labeled "oral electrolyte" is basically the WHO formula.Fact: Retail products vary widely in sodium, glucose, osmolality, flavoring, and intended use. Some are close to WHO-style ORS and some are not [3][10].

Sources & References

Government & Institutional Sources

1. World Health Organization, UNICEF. Oral Rehydration Salts: Production of the New ORS. WHO/FCH/CAH/06.1. 2006.
2. King CK, Glass R, Bresee JS, Duggan C. Managing Acute Gastroenteritis Among Children: Oral Rehydration, Maintenance, and Nutritional Therapy. MMWR Recomm Rep. 2003;52(RR-16):1-16.
3. Centers for Disease Control and Prevention. Information for Healthcare Professionals: Food Safety. Updated April 24, 2024. https://www.cdc.gov/food-safety/hcp/information/
4. Oral Rehydration Salt Solutions for Children: A Review. PubMed PMID: 40588279.
5. Multicenter, randomized, double-blind clinical trial to evaluate the efficacy and safety of a reduced osmolarity oral rehydration salts solution in children with acute watery diarrhea. PubMed PMID: 11335732.
6. Hahn S, Kim Y, Garner P. Reduced osmolarity oral rehydration solution for treating dehydration due to diarrhoea in children: systematic review. BMJ. 2001;323(7304):81-85. PubMed PMID: 11451782.
7. Musekiwa A, Volmink J. Oral rehydration salt solution for treating cholera: ≤270 mOsm/L solutions vs ≥310 mOsm/L solutions. Cochrane Database Syst Rev. 2011. PubMed PMID: 22161381.
8. MedlinePlus. Dehydration. U.S. National Library of Medicine. https://medlineplus.gov/dehydration.html
9. Imperial College Healthcare NHS Trust. St Mark's Solution. Published June 2024. https://www.imperial.nhs.uk/~/media/website/patient-information-leaflets/gastroenterology/st-marks-solution.pdf
10. Health Canada Natural and Non-Prescription Health Products Directorate. Product information record for Hydralyte Effervescent Electrolyte Granules, NPN 80094967. https://health-products.canada.ca/lnhpd-bdpsnh/info?licence=80094967
11. World Anti-Doping Agency. Prohibited List. In force January 1, 2026. https://www.wada-ama.org/en/resources/world-anti-doping-code-and-international-standards/prohibited-list
12. USADA. World Anti-Doping Agency (WADA) Prohibited List. Accessed March 26, 2026. https://www.usada.org/athletes/substances/prohibited-list
13. PubChem compound records for sodium chloride (CID 5234), potassium chloride (CID 4873), D-glucose (CID 5793), and trisodium citrate dihydrate (CID 71474). National Library of Medicine. https://pubchem.ncbi.nlm.nih.gov/

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