What is the healthiest electrolyte drink?

Reviewed and updated: 16 September 2026

The healthiest electrolyte drink is the one whose label matches what your body is actually short of, and for most people in the UK on an ordinary day that is plain water alongside meals, not a sachet. There is no single winning brand. Once you can read four numbers on the back of a pack, sodium, sugar, potassium and magnesium, you can judge any electrolyte drink in about twenty seconds, and you will find that some of the most expensive ones are the weakest and that a glass of milk quietly outperforms most of them.

I get asked this question a lot, usually by people who have seen the same three or four brands advertised at them all week and cannot work out what actually separates them. So rather than hand you another ranked shopping list, I want to teach you the label. That way the answer keeps working when the brands change.

What is the healthiest electrolyte drink? The honest answer

The healthiest electrolyte drink is the one that supplies the minerals you are genuinely low on, in amounts that suit your day, without dragging a large amount of extra salt or sugar along with it. That sounds like a dodge until you realise what it rules out. It rules out the idea that there is a best product to buy. It rules out judging a drink by how many minerals appear on the front of the pack. And it rules out the common assumption that more sodium equals better hydration, which for most people eating a normal UK diet is the opposite of true.

Here is the uncomfortable bit for a category built on scarcity marketing. In a randomised trial from Loughborough, Bangor and Stirling universities that compared thirteen everyday drinks for how much fluid people actually retained, a commercial sports drink was no better than still water. What did beat water were an oral rehydration solution and, of all things, milk, both full-fat and skimmed, which retained roughly half as much fluid again as water over the two hours after drinking. That study is worth knowing about before you spend anything, and I will come back to it properly below.

The quick answer, at a glance

• What an electrolyte drink is: water carrying dissolved minerals, usually sodium and chloride, often potassium and magnesium, sometimes calcium, and frequently some form of sugar.
• Who it is genuinely for: people losing a lot of fluid, through heavy sweating, hot weather, a long or intense training session, or illness with vomiting or diarrhoea, and people whose food intake has dropped sharply so their minerals are arriving in smaller amounts.
• Who does not need one: most people, most days. Food carries the great majority of your minerals and a decent share of your water, so eating normally and drinking to thirst does the job.
• The four numbers to check: sodium or salt per serving, sugar per serving, potassium per serving, magnesium per serving. Everything else on the pack is decoration.
• The honest caution: a UK adult already eats more salt than the recommended ceiling, so adding a high-sodium drink on a normal day is not neutral. If you have high blood pressure or kidney problems, speak to your GP or pharmacist before starting one.

What "healthiest" actually means on an electrolyte label

Healthiest is a word the category has quietly redefined to mean cleanest ingredient list. That is not useless, but it is the wrong target. A drink can be organic, naturally flavoured, free from artificial colours and still carry a gram of salt per serving that you did not need. Healthiest, used properly, means best matched to your requirement, and requirement is the variable nobody wants to talk about because it differs person to person and day to day.

So think of it as a fit question rather than a quality question. A marathon runner in July and an office worker in February have almost nothing in common in terms of mineral losses, yet the shelf sells them the same sachet. The four checks below are how you tell whether a product is built for your day.

1. Sodium per serving

Sodium is the electrolyte lost in the largest quantity in sweat, and it is the one doing the real work in a rehydration drink because it helps the body hold on to the water you have just swallowed rather than sending it straight to the bladder. That is a genuine physiological effect and it is why oral rehydration solutions work.

It is also the one most likely to be excessive for ordinary use. Some popular hydration sachets carry between 500mg and 1,000mg of sodium per stick, which is 1.25g to 2.5g of salt. On a day when you have not sweated heavily, that is a meaningful slice of your allowance for nothing in return.

2. Sugar per serving

Sugar in an electrolyte drink is not automatically a villain and it is not automatically a benefit either. It depends entirely on why you are drinking it. More on this below, because it is the point most articles get lazily wrong in both directions.

3. Potassium per serving

Potassium is the one most often present in a token amount. Plenty of drinks list it proudly and then supply 50mg or 100mg, against a UK nutrient reference value of 2,000mg. That is two to five per cent of a day's reference intake, which is not nothing but is nowhere near enough to matter. A medium banana gives you roughly 400mg. A baked potato with the skin on gives more.

4. Magnesium per serving and its form

Magnesium is the fourth number, and the one where the form on the label genuinely changes the experience. Magnesium contributes to electrolyte balance, to normal muscle function and to normal energy-yielding metabolism, which is why it belongs in this conversation at all. But a drink using a cheap, poorly tolerated magnesium salt can send you to the loo rather than rehydrate you, and I have seen people blame the electrolytes when the culprit was the form.

How to read a UK electrolyte label, including the salt-to-sodium trap

This is the single most useful skill in this whole article, and it is the thing none of the big pages ranking for this question teach you. UK back-of-pack nutrition labels declare salt in grams. Many electrolyte brands, particularly those designed for a United States audience, headline sodium in milligrams. These are not the same number and the difference is a factor of two and a half.

Converting between the two

• To turn sodium into salt: multiply the sodium figure by 2.5. So 400mg sodium is 1g of salt.
• To turn salt into sodium: divide the salt figure by 2.5. So 1.5g salt is 600mg of sodium.

Run that on a few real products and the picture changes fast. A sachet advertising 1,000mg of sodium is carrying 2.5g of salt. The NHS advises adults to eat no more than 6g of salt a day in total, so that one sachet is around 40 per cent of the whole day's ceiling before you have eaten anything. If you are having two a day, which the marketing often encourages, you are at roughly 80 per cent from drinks alone.

Per serving versus per 100ml

The second trap is the column you are reading. UK labels must give values per 100g or per 100ml, and may also give them per serving. A ready-to-drink bottle showing a modest-looking salt figure per 100ml may hold 500ml, so you multiply by five. A powder showing values per 100g of powder is nearly meaningless to you, because you are consuming one scoop of maybe 6g, so you need the per-serving column or you need to do the arithmetic yourself.

My habit is to ignore the front of the pack entirely, find the per-serving column, and write down four figures. If a product will not give me a per-serving column, that alone tells me something about how much it wants me to understand what I am buying. If label reading in general is new to you, the wider guide on how to read supplement labels covers the same logic across every category we sell.

How much sodium your ordinary UK day already gives you

This is the context that changes the whole decision, and it is missing from almost every article on the topic because most of them are written for a US readership or by a brand with sachets to shift.

The NHS ceiling for adults is 6g of salt a day, equivalent to 2.4g of sodium. National dietary surveys have consistently put average UK adult intake above that, somewhere around 8g of salt a day, and the great majority of it does not come from the salt cellar. It arrives already dissolved in bread, cereals, cheese, bacon and ham, ready meals, sauces, soups and takeaways. You are not adding sodium to an empty account. For most people, most days, the account is already overdrawn.

Which gives you a clean rule of thumb. If your day has involved no unusual sweating, no illness and no heat, a high-sodium drink is not a health product for you, it is a salty drink. The picture is different if you have been sweating heavily for an hour or more, if you have been unwell, or if you are eating a great deal less than you used to and so are taking in far less sodium from food than the national average suggests. That last case is genuinely underserved and I have written about it separately in the guide on whether you need electrolytes during weight loss.

Sugar-free or sugar-containing, and when the sugar is doing a job

Sugar-free has become shorthand for healthier, and in the general case that is reasonable. The NHS advises adults to keep free sugars to no more than 30g a day, and drinks are an easy place to overshoot it without noticing.

But there is a real mechanism that makes sugar useful in one specific situation, and it is worth understanding rather than dismissing. Sodium and glucose are absorbed together across the gut wall by a shared transporter, and water follows them. This coupling is the reason oral rehydration solutions contain glucose at all. It is not there for energy. It is there to pull sodium and water across faster, which is why an ORS is the tool of choice when someone is genuinely dehydrated from vomiting or diarrhoea.

So the honest position is this. If you are rehydrating after real fluid loss, a modest amount of sugar alongside sodium helps. If you are sipping something at a desk because the tin looked appealing, the sugar is doing nothing except adding to your daily total. Sweeteners in place of sugar are fine for that second case and carry no meaningful hydration penalty. They just do not carry the absorption benefit either, because there is nothing to co-transport.

A practical note for anyone eating much less than they used to: calories are scarce, so a drink spending 80 or 120 of them on flavour is a genuinely poor trade unless you actually need the carbohydrate. In that situation I would nearly always choose the sugar-free version and get the carbohydrate from food.

The potassium and magnesium question

These two are where the most marketing happens and the least substance usually sits.

Potassium

Potassium contributes to normal muscle function, to normal functioning of the nervous system and to the maintenance of normal blood pressure. Most people in the UK fall short of the 2,000mg reference value, and a systematic review and meta-analysis published in the BMJ by Aburto and colleagues, pooling 22 randomised trials and 11 cohort studies, found that increasing potassium intake lowered systolic blood pressure by around 3.5 mmHg in adults, with the effect concentrated in people who already had high blood pressure, and was associated with a materially lower risk of stroke. That is a real finding about dietary potassium, not a promise about any drink.

The catch is that food is where the useful amounts live. Potatoes, beans and lentils, bananas, dried apricots, spinach, tomatoes, milk and fish all carry substantial potassium. An electrolyte sachet giving you 100mg is contributing about five per cent of a reference intake. If potassium is your reason for buying, the drink is close to the least efficient route available to you.

Magnesium, and why the form matters more than the number

Magnesium contributes to electrolyte balance, to normal muscle function, to the normal functioning of the nervous system and to normal energy-yielding metabolism. Its nutrient reference value is 375mg. For a claim like that to be permitted on a pack at all, the product has to supply at least 15 per cent of that value, which is about 56mg, and a surprising number of hydration drinks sit below the line while still implying the benefit in their copy.

Form is the other half of the story. Magnesium oxide is cheap and delivers a big headline number of magnesium compound, but a much smaller amount is absorbed and the rest draws water into the bowel, which is precisely the opposite of what you want from a hydration product. Magnesium citrate absorbs better but is noticeably laxative for some people at higher amounts. Magnesium glycinate is the gentlest of the common forms and is the one I would look for if magnesium is what you are actually after. I have set the three side by side in the comparison of magnesium glycinate versus citrate, and the wider guide to choosing a magnesium supplement in the UK goes through elemental amounts properly.

This is also the honest reason I would sometimes point someone at a magnesium capsule rather than a hydration sachet. If the thing you want is a meaningful, well-absorbed daily magnesium amount, a drink that also carries 1.5g of salt is an odd way to get it. Our own triple-form magnesium glycinate complex supplies 384mg of elemental magnesium, which is 102 per cent of the reference value, with no sodium and no sugar attached, and it is formulated in the UK and tested for purity and heavy metals at our GMP-certified facility. It is not an electrolyte drink and I am not going to pretend it is one. It simply solves the magnesium half of the problem cleanly.

Whole-food and homemade routes, and how they compare

This is where the category gets embarrassed, so most articles skip it.

In the Loughborough beverage hydration trial I mentioned earlier, 72 participants each drank a litre of one of thirteen drinks and had their urine collected for four hours afterwards. Compared with still water, the drinks that produced significantly less urine output, meaning more fluid retained, were an oral rehydration solution and milk. Full-fat milk and skimmed milk performed essentially the same. Cola, diet cola, hot tea, iced tea, coffee, lager, orange juice, sparkling water and a commercial sports drink were all statistically indistinguishable from plain water.

Milk works because it brings sodium, potassium and some calcium alongside protein and a little lactose, and it empties from the stomach more slowly, so the fluid arrives in a steadier trickle rather than a flood that triggers a diuresis. It is also, per serving, one of the cheapest sources of all three minerals you are trying to buy.

Other everyday routes worth knowing:

• Coconut water is genuinely high in potassium, typically around 250mg per 100ml, but low in sodium, usually around 25mg per 100ml. That makes it a decent potassium top-up and a poor choice if sodium replacement is the point.
• Diluted fruit juice with a pinch of salt gets you close to a homemade sports drink for pennies. Roughly half juice and half water, with about a quarter of a teaspoon of table salt per litre, lands in a sensible range for both carbohydrate and sodium.
• Squash with a pinch of salt does the same job with fewer calories if you want the fluid and the sodium without the sugar load.
• A bowl of soup is, unromantically, an excellent rehydration vehicle. Water, sodium, potassium and usually some protein in one go.
• Salted food plus plain water is the option nobody sells. Toast with a poached egg and a glass of water will do more for a depleted person than most sachets.

I am not telling you to avoid buying anything. Convenience is a legitimate reason to buy a product, and a sachet in a gym bag is easier than a carton of milk. I am telling you to price the convenience honestly instead of believing you are buying something food cannot give you.

Powders, tablets and ready-to-drink: the trade-offs

The format changes cost, control and how likely you are to actually use it.

• Powders and sachets give the largest mineral amounts and the widest formulation range, which cuts both ways: the strongest options and the saltiest options both live here. They are usually the best value per serving. The downside is a fixed dose, so if a sachet is too salty for your day, your only lever is to use half of it.
• Effervescent tablets are the most portable and usually the mildest, with lower sodium than the sachet category. They frequently carry very little magnesium. Check whether the tablet includes sorbitol or mannitol, which can be windy at a few tablets a day.
• Ready-to-drink bottles are the most expensive per serving by some distance and the most likely to hide their real numbers behind a per-100ml column. Their advantage is that you will actually drink them, which matters more than people admit.
• Concentrated liquid drops let you dose to taste, which is genuinely useful, but they are often heavy on trace minerals and light on the sodium and potassium that do the work.

Oral rehydration salts, sports drinks and everyday hydration drinks are three different products

Treating these as interchangeable is the most common mistake I see, and it is the reason some people find electrolyte drinks unpleasant or ineffective.

Oral rehydration salts, the pharmacy sachets, are a medical rehydration formula with a carefully balanced sodium and glucose ratio designed to treat dehydration from vomiting and diarrhoea. They are not intended as a daily drink, they usually taste of it, and they carry dosing instructions for a reason. This is the format to reach for when someone has been genuinely unwell, and a pharmacist can advise on it in minutes.

Sports drinks are built around exercise, so they carry carbohydrate for fuel as well as sodium for fluid retention. They make sense during or after prolonged or intense exercise and make very little sense at a desk.

Everyday hydration drinks are the newest category and the loosest. Some are close to a sports drink without the sugar, some are essentially flavoured water with a mineral rounding error. This is the category where reading the label pays for itself.

Who actually needs an electrolyte drink

Being straight with you, since we have nothing to sell you in this category: most people, on most days, do not need one. The case for buying is real in these situations.

• Heavy or prolonged sweating. An hour or more of hard exercise, manual work in heat, or a hot holiday. Sweat carries sodium in quantity and this is the clearest case of all.
• Illness with vomiting or diarrhoea. Here you want oral rehydration salts specifically, not a lifestyle hydration drink, and a pharmacist is the right first call.
• Genuinely low food intake. If your portions have dropped sharply, through illness, a small appetite, ageing or a deliberate reduction, your minerals have dropped with them, because food carries most of them. This is a legitimate case and it is the one I write about most, since it is the situation our readers are most often in.
• Certain medical situations, including some medicines that increase fluid or mineral losses. This is a GP or pharmacist conversation, not a supermarket one.

Outside those, water with meals is doing more for you than any sachet, and the food on the plate is supplying between a fifth and a quarter of your total water intake as well as nearly all your minerals. European scientific advice puts adequate total water intake at about 2 litres a day for women and 2.5 litres for men, from all sources, food included. The rest is thirst, which is a better-calibrated instrument than most people give it credit for.

Upper limits and who should take particular care

These are the numbers worth having in your head before you buy anything.

• Salt: no more than 6g a day for adults, equivalent to 2.4g of sodium, from everything combined.
• Free sugars: no more than about 30g a day for adults.
• Magnesium from supplements: European scientific advice sets 250mg a day for supplemental magnesium in readily dissociable salts, while the UK Expert Group on Vitamins and Minerals set a guidance level of 400mg a day. The commonest effect of overshooting is loose stools rather than anything serious, and it is form-dependent.
• Potassium from supplements: the UK Expert Group concluded that supplemental potassium up to roughly 3,700mg a day would not be expected to cause problems in most healthy adults, while specifically flagging older adults and people on certain medicines as more vulnerable. Most UK products sit far below this.
• Calcium: a tolerable upper intake of 2,500mg a day from all sources.

Take particular care, and speak to a professional first, if any of the following apply to you:

• Kidney disease, of any stage. Damaged kidneys clear potassium poorly, and a high-potassium product can be genuinely dangerous. This is the most important single caution on this page.
• High blood pressure, or any blood-pressure medicine. ACE inhibitors, angiotensin receptor blockers and potassium-sparing diuretics all raise potassium, so added potassium needs a professional eye. High-sodium products also pull against what the medication is trying to do.
• Heart failure or a fluid restriction. Both the volume and the sodium matter here.
• Diabetes, where a sugar-containing drink needs to be counted rather than treated as a free extra.
• Pregnancy or breastfeeding, where fluid needs genuinely rise, but the sensible route is food, water and a word with your midwife rather than a high-sodium product.
• Older adults, who are more likely to be on multiple medicines and less likely to feel thirst reliably.

What to ignore in the marketing

Some of this category's favourite selling points carry no information at all.

• "Contains 72 trace minerals." Almost always from a salt or seawater source, present in microgram amounts, and nutritionally irrelevant. It is a count, not a dose.
• "Doctor formulated" or "developed by scientists". Neither phrase carries a defined meaning or any oversight.
• "Hydrates you three times faster than water." Faster is not the goal and the comparison is rarely anchored to anything you can check.
• "No artificial anything." Fine as a preference, but it tells you nothing about whether the sodium and potassium amounts suit you.
• Athlete endorsements. A professional athlete's sweat losses have no bearing on your Tuesday.
• Front-of-pack mineral lists with no amounts. If the number is not on the front, there is usually a reason.

What I would personally look for

If I were buying one, here is the shortlist I would apply, in order.

1. Decide the job first. Sweat replacement, illness recovery, or topping up minerals because you are eating less. These three want different products.
2. Match the sodium to the job. For heavy sweating, several hundred milligrams per serving is appropriate. For a normal day, I want it low, under about 200mg, or I want a different product entirely.
3. Check potassium is a real number. Below 100mg per serving it is decorative. I would rather eat a banana.
4. Check magnesium clears 56mg and check the form. Glycinate over citrate over oxide, for tolerance.
5. Check the sugar against the purpose. Useful when rehydrating after real losses, otherwise dead weight.
6. Work out the cost per serving, then compare it honestly against milk, a soup or a pinch of salt in squash.

Six checks, about twenty seconds once you are used to it, and it works on any product in any shop. That is the answer I would want if I were standing in the aisle, and it is a good deal more durable than a list of this year's brands.

If you want the neighbouring questions, I have covered how many electrolyte drinks a day is too many and whether electrolytes are better in the morning or at night separately, there is a companion guide on the best electrolytes to take when you are eating much less, and the broader picture sits in the guide to what to take when you are eating less.

A few cautions worth knowing

Electrolyte drinks are food, not medicine, and they behave like food. Too much sodium in a day is the most likely problem, and it is easy to reach if you are having more than one serving on top of an ordinary diet. Loose stools are the second most likely, and the usual culprit is the magnesium form rather than the concept. Very large volumes of plain water drunk quickly, with no sodium at all, can dilute blood sodium, which is rare but genuinely serious, and it is one of the few arguments in favour of an electrolyte drink during very long endurance events.

If you take any regular medication, particularly for blood pressure, the heart or the kidneys, check with your pharmacist before adding a potassium-containing product. They will do it in a minute and it is free.

When to speak to a GP or pharmacist

Book an appointment rather than buying a drink if you have persistent thirst that water does not settle, if you are passing much more urine than usual, if cramps or fatigue are ongoing rather than occasional, if you have been unwell with vomiting or diarrhoea for more than a couple of days, or if you are losing weight without meaning to. Those are all signals that deserve a proper look rather than a sachet, and an electrolyte drink can mask them for a while without doing anything about the cause.

Frequently asked questions

Is coconut water the healthiest electrolyte drink?

It is a good source of potassium, typically around 250mg per 100ml, but it is low in sodium at roughly 25mg per 100ml. So it suits a potassium top-up and does not suit replacing sweat losses, where sodium is the main thing you have lost. It also carries natural sugars, which count towards your daily total.

Is milk really better than a sports drink for hydration?

In the Loughborough beverage hydration trial, both full-fat and skimmed milk retained significantly more fluid than still water over four hours, while a commercial sports drink did not differ from water. Milk brings sodium, potassium and calcium alongside protein and empties from the stomach more slowly. That does not make milk right for every situation, but it does make it a serious and very cheap option.

Can I just add salt to water?

You can, and roughly a quarter of a teaspoon of table salt in a litre lands in a sensible sodium range. Adding some diluted juice or squash makes it more palatable and, if you are rehydrating after real fluid loss, the carbohydrate helps sodium and water cross the gut wall. It is the cheapest option on this page by a wide margin.

Should an electrolyte drink be sugar-free?

For everyday use, yes, I would choose sugar-free. For rehydrating after heavy sweating or illness, a modest amount of sugar genuinely helps, because sodium and glucose are absorbed together and water follows them.

How much sodium should an electrolyte drink have?

It depends on the job. For an hour or more of heavy sweating, several hundred milligrams per serving is reasonable. For ordinary daily use in the UK, where average salt intake already exceeds the 6g ceiling, I would want it under about 200mg per serving, or I would not use one at all.

Are electrolyte drinks worth it if I am eating much less than usual?

This is the strongest everyday case for them, because food normally carries most of your minerals and a fifth to a quarter of your water. When portions shrink sharply, both drop together. Even then, the sensible order is food first, then a well-matched low-sugar drink, and a word with your GP if the reduced intake is not deliberate.

Is Dioralyte the same as an everyday electrolyte drink?

No. Oral rehydration salts are a medical rehydration formula with a specific sodium and glucose balance, intended for dehydration from vomiting or diarrhoea and used according to their instructions. Everyday hydration drinks are not built for that job and should not be substituted for it. Ask a pharmacist if someone is unwell.

Sources

• Maughan RJ and colleagues. A randomized trial to assess the potential of different beverages to affect hydration status: development of a beverage hydration index. American Journal of Clinical Nutrition 2016;103(3):717-23. doi 10.3945/ajcn.115.114769. Record on PubMed.
• Aburto NJ and colleagues. Effect of increased potassium intake on cardiovascular risk factors and disease: systematic review and meta-analyses. BMJ 2013;346:f1378. doi 10.1136/bmj.f1378. Full text on PMC.
• Murphy C, Hahn S, Volmink J. Reduced osmolarity oral rehydration solution for treating cholera. Cochrane Database of Systematic Reviews 2004;(4):CD003754. doi 10.1002/14651858.CD003754.pub2. Record on PubMed.
• NHS. Salt: the facts. nhs.uk.
• European Food Safety Authority. Scientific opinion on dietary reference values for water. efsa.europa.eu.

The neighbouring guides are gathered together in our supplement guides hub, and everything we make sits on the Pure Vitamins UK home page.

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Dr. Miron, Founder of Pure Vitamins UK

Food supplements are not a substitute for a varied and balanced diet and a healthy lifestyle. This article is for general information and is not medical advice. If you are pregnant, breastfeeding, taking medication or living with a health condition, speak to your GP or pharmacist before starting a supplement.