Is 2 electrolyte drinks a day too much?

Reviewed and updated: 9 September 2026

Is 2 Electrolyte Drinks a Day Too Much? The Honest Answer

For most healthy adults, 2 electrolyte drinks a day is not too much on a hot day or a heavy training day, but it can easily be too much as a daily habit, and the deciding factor is almost always the sodium number on the sachet rather than the number of sachets. Two servings of a low-sodium drink at 200 mg each add about 1 g of salt to your day and barely register. Two servings of a high-sodium drink at 1,000 mg each add 5 g of salt, which is most of the entire UK daily target before you have eaten a single meal. Same "two a day", completely different answer.

That is the part almost nobody tells you, so this guide walks through the actual arithmetic, what your kidneys are doing with all of it, the situations where a second drink genuinely earns its place, and the situation the big American health sites never cover at all: what to do when the reason you are reaching for electrolytes is that you are eating much less food than you used to.

The Quick Answer at a Glance

• What we are really asking: not "how many sachets" but "how many milligrams of sodium, potassium and magnesium are you adding to what your food already gives you".
• Who two a day suits: people sweating heavily for long stretches, working in heat, unwell with vomiting or diarrhoea, or eating so little that their food is no longer supplying the minerals it used to.
• Who it does not suit: a desk-based adult on a normal British diet, where two high-sodium servings can push total salt well past the 6 g daily maximum.
• The number to find on the label: sodium in mg per serving. Multiply by 2.5 to get grams of salt. Multiply that by however many servings you take.
• One honest caution: if you have kidney disease, heart failure, high blood pressure, or you take blood pressure medicines, diuretics or potassium-sparing tablets, speak to your GP or pharmacist before adding any electrolyte product, at any dose.

What Is Actually in an Electrolyte Drink

Electrolytes are simply minerals that carry an electrical charge once they dissolve in your body's fluid. That charge is what lets nerves fire, muscles contract and water move in and out of your cells. The main ones in a commercial sachet are sodium, potassium and magnesium, sometimes with chloride and calcium alongside them.

Sodium

Sodium is the one that does most of the work, and the one that causes most of the trouble. It is the dominant mineral in the fluid outside your cells, and it is the mineral you lose most of in sweat. It is also the one that varies most wildly between products. Some hydration sachets carry 200 mg of sodium per serving. Some of the popular high-performance brands carry 1,000 mg or more. Since 1 g of sodium is equivalent to 2.5 g of salt, that top-end sachet is delivering 2.5 g of salt in a single drink.

The NHS advice for adults in the UK is no more than 6 g of salt a day in total, which works out at roughly 2.4 g of sodium. National survey data has repeatedly put the average British adult somewhere above that target already, largely from bread, processed meat, cheese, sauces and eating out rather than from the salt cellar. So the honest way to think about a sachet is not as a health product sitting outside your diet but as another salt-containing item inside it.

Potassium

Potassium is sodium's counterweight. It is the dominant mineral inside your cells, and it is the one most British diets are short of rather than swimming in, because it comes mainly from vegetables, fruit, beans, potatoes and dairy. The UK reference nutrient intake for adults is 3,500 mg a day. A typical electrolyte sachet contributes somewhere between 100 mg and 400 mg, so two servings usually make a modest contribution rather than a risky one.

Potassium carries several authorised GB nutrient function claims: potassium contributes to normal functioning of the nervous system, potassium contributes to normal muscle function, and potassium contributes to the maintenance of normal blood pressure. Those apply to the nutrient at appropriate intakes, which is worth knowing when you are comparing a sachet that contains a meaningful amount against one that has a token dusting.

Magnesium

Magnesium is the third name on most labels and usually the smallest number. It is involved in hundreds of enzyme reactions, and it holds a long list of authorised GB claims: magnesium contributes to electrolyte balance, magnesium contributes to normal muscle function, magnesium contributes to normal energy-yielding metabolism, magnesium contributes to the normal functioning of the nervous system, and magnesium contributes to the reduction of tiredness and fatigue. Notice that "contributes to electrolyte balance" is a claim magnesium actually holds, which is more than can be said for a lot of the language printed on hydration packaging.

The catch is quantity. Most electrolyte sachets carry 50 mg to 100 mg of magnesium. The UK reference nutrient intake is 300 mg a day for men and 270 mg for women, and the nutrient reference value used on labels is 375 mg. Two sachets at 60 mg each will not get you close. If magnesium is the mineral you are actually after, a dedicated triple-form magnesium glycinate complex gives you the full daily amount without also handing you a gram of sodium and a spoonful of sugar. Our own formula delivers 384 mg of elemental magnesium per serving, which is 102% of the nutrient reference value, and it is worth comparing that against what your sachet is really providing.

The Rest of the Sachet

Beyond the minerals, most drinks contain some form of sugar or sweetener, flavourings, an acidity regulator and occasionally added vitamins. The sugar is not always a bad thing. A small amount of glucose speeds sodium and water absorption across the gut wall, which is exactly why oral rehydration solutions are formulated the way they are. But if you are having two a day, the sugar adds up as reliably as the salt does.

How Your Kidneys Handle All of This

Here is the reassuring part, and the reason a healthy adult has a lot of room for error. Your kidneys are extraordinarily good at holding your blood sodium concentration within a narrow band regardless of what you drink. Take in more sodium than you need and they excrete the surplus in urine. Take in less and they claw it back through a hormonal system involving aldosterone and antidiuretic hormone. This happens continuously, without you noticing, and it is why one extra sachet does not produce a dramatic event in a person with normal kidney function.

What that regulation is not, however, is free. Handling a persistently high sodium load is associated with higher blood pressure over time, and the relationship is not a cliff edge you fall off at some threshold. A systematic review and meta-analysis of 133 randomised trials involving over 12,000 participants found a dose-response relationship, with each 50 mmol reduction in 24 hour sodium excretion associated with a 1.10 mm Hg fall in systolic blood pressure, and the effect present in people with and without high blood pressure alike (Huang and colleagues, 2020, DOI: 10.1136/bmj.m315). A separate dose-response meta-analysis of 85 experimental studies published in Circulation reached a similar conclusion, describing an approximately linear relationship across the whole range of sodium intake studied, with no flattening at either end (Filippini and colleagues, 2021, DOI: 10.1161/CIRCULATIONAHA.120.050371).

That is science about sodium, not a claim about any supplement. But it is the reason my answer to "is two a day too much" is a question rather than a yes or no. Two servings of something carrying 1,000 mg of sodium each, every day, for months, is a meaningful ongoing addition to a diet that is very likely already salty. Two servings of something carrying 200 mg is background noise.

When a Second Electrolyte Drink Genuinely Earns Its Place

There are real situations where two a day is sensible and I would not blink at it.

• Prolonged heavy sweating. Long training sessions, endurance events, or several hours of physical work in heat. This is the classic case and the one every article covers.
• Working in a hot environment. Kitchens, foundries, roofing, warehouses in a July heatwave. Sweat losses here can rival athletic training and go on for a full shift.
• Vomiting or diarrhoea. Fluid and electrolytes are being lost directly and quickly. This is what oral rehydration solutions exist for, and a pharmacy rehydration sachet is a better tool than a sports drink here. If symptoms are severe or last more than a couple of days, that is a call to your GP or 111 rather than a shopping decision.
• Very low food intake. The case almost nobody writes about, and the one I want to spend proper time on below.

Outside those, most people asking this question are asking because they enjoy the drink and want permission. The honest answer is that the drink is fine, and the sodium number is the thing to keep an eye on.

When Two a Day Is Probably One Too Many

If you are largely sedentary, eat a typical British diet with bread, cheese, sauces and the occasional takeaway, and you are drinking two high-sodium sachets a day out of habit rather than need, you are adding several grams of salt to a diet that was already above target. Nothing dramatic will happen tomorrow. But you are working against yourself if blood pressure is something you or your GP are keeping an eye on.

The same applies if you are using electrolyte drinks as a substitute for drinking water. Interestingly, when researchers compared 13 common beverages for how much fluid was still retained two hours after drinking, sports drinks were no better than plain still water. What did outperform water was an oral rehydration solution and, unexpectedly, milk, both full-fat and skimmed (Maughan and colleagues, 2016, DOI: 10.3945/ajcn.115.114769). The reason is composition rather than branding. Solutions with a higher electrolyte and energy content empty from the stomach more slowly and are retained longer. A flavoured sachet with 200 mg of sodium is, hydration-wise, close to water with a nicer taste.

What Happens If You Take on Too Much

Overdoing electrolytes in a healthy adult with normal kidneys is genuinely uncommon, but it is worth knowing what each mineral looks like when it is overdone.

Too Much Sodium

In the short term, a big sodium load makes you thirsty, can leave you feeling puffy or bloated as your body holds on to water to dilute it, and may show up as a jump on the scales that has nothing to do with fat. Over the longer term the concern is blood pressure, as the two meta-analyses above set out. If you notice persistent puffiness in your hands, feet or face after starting a high-sodium hydration habit, that is a reason to look at the label rather than to add a third sachet.

Too Much Potassium

Very high blood potassium is a serious problem, but it is almost always a consequence of kidney disease or certain medicines rather than of drinking. Healthy kidneys clear potassium efficiently. The Expert Group on Vitamins and Minerals set a guidance level of 3,700 mg a day for supplemental potassium in the UK, and typical electrolyte sachets sit far below that. The people who need to be careful here are specific and identifiable: chronic kidney disease, and anyone taking potassium-sparing diuretics, ACE inhibitors or angiotensin receptor blockers. If that is you, do not add potassium-containing products without asking your GP or pharmacist first.

Too Much Magnesium

Magnesium's warning sign is unmistakable and arrives long before anything dangerous does: loose stools. Magnesium salts draw water into the bowel, which is why some forms are used as laxatives. The Expert Group on Vitamins and Minerals guidance level for supplemental magnesium is 400 mg a day for readily absorbed forms, and that figure is set on the basis of digestive tolerance rather than toxicity. Two electrolyte sachets are nowhere near it. Do note that this limit applies to magnesium from supplements, not to the magnesium in your food, which behaves differently.

The Case Nobody Writes About: When You Are Eating Much Less

Every article you will find on this question is written for athletes or for general hydration. None of them address the situation I get asked about most often, which is this: someone's appetite has dropped a long way, they are eating a fraction of the food volume they used to, and they have started using electrolyte drinks because they feel light-headed, tired or off-balance.

The logic is sound, because the mechanism is real. Most of your daily sodium, potassium and magnesium comes from food, not from a sachet. When food volume falls sharply, mineral intake falls with it, and it falls fastest for the minerals that were being supplied by the foods you have stopped eating. Potassium is the obvious casualty because it lives in vegetables, potatoes, beans, fruit and dairy. Magnesium follows, because it comes largely from wholegrains, nuts, seeds and green vegetables. Sodium is usually the last to become a problem, because even a small amount of bread, cheese or a ready meal carries a surprising amount of it.

So the sensible order of operations when you are eating much less is not the same as the athlete's order.

• Food density comes first. If total volume is limited, every mouthful has to carry more. A small portion of oily fish, some spinach, a handful of nuts and a yoghurt outperform a litre of flavoured water on every mineral involved.
• Potassium and magnesium are the likelier gaps, not sodium. Most electrolyte sachets are built for sweat losses, which means they are sodium-heavy and light on everything else. That is the wrong shape for this problem.
• A dedicated mineral is often the tidier answer. If magnesium is what has dropped, taking magnesium directly gets you the full nutrient reference value without 2 g of added sodium and a sugar load you may not want.
• Two sachets is not automatically the fix. Doubling a sodium-heavy product to correct a potassium and magnesium shortfall mostly gives you more sodium.

If your appetite has fallen away for reasons you cannot explain, or you are feeling faint, unusually weak or persistently dizzy, that is a conversation with your GP rather than a supplement decision. I have written more about the wider nutrient picture in our guide to supplements when you are eating less, and specifically about the nutrients that fall short first in what vitamin to take if you do not eat enough. If the appetite itself is the question, which vitamins are involved in appetite covers the nutrients that come into it. And if you want the four minerals themselves ranked for a smaller plate rather than for a sweaty one, the best electrolytes to take when you're eating much less takes each in turn.

How to Read a UK Electrolyte Label

This is the practical skill that answers the question for your particular product rather than in the abstract. Four things to find.

• Sodium in mg per serving, not per 100 ml. Products are sometimes declared per 100 ml, which flatters a large serving. Work out the number for the whole sachet or bottle.
• Convert to salt. Multiply sodium in grams by 2.5. So 800 mg of sodium is 0.8 g, which is 2 g of salt. Two of those is 4 g, against a 6 g daily maximum.
• Potassium and magnesium in mg, with the NRV percentage. If the label does not give you a percentage, compare it yourself against 2,000 mg for potassium and 375 mg for magnesium, which are the nutrient reference values used on UK labels.
• Sugar per serving. Useful for absorption during heavy sweating, less useful twice a day at a desk.

If label reading is not something you have done before, our step-by-step guide to reading supplement labels walks through the whole panel, the full Pure Vitamins supplement guides hub collects everything else we have written in one place, and if you are choosing between products rather than checking one you already own, what makes for the healthiest electrolyte drink applies the same four checks across the whole category.

How Much Sodium Do You Actually Lose in Sweat

Less predictably than the marketing implies. Sweat sodium concentration varies enormously between individuals and within the same individual depending on intensity, heat acclimatisation, diet and hydration status, and the measurement methods themselves differ enough to produce inconsistent results (Baker, 2017, DOI: 10.1007/s40279-017-0691-5). That variability is precisely why a single blanket recommendation for everyone is unsatisfying.

More usefully, when a researcher modelled sodium requirements across realistic exercise scenarios, targeted sodium replacement turned out to be unnecessary in every realistic scenario modelled for a football match or an elite marathon. It only became necessary in a 160 km ultramarathon, and only when sweat rate was high, sweat sodium was high and more than 80% of fluid losses were being replaced (McCubbin, 2022, DOI: 10.1080/17461391.2022.2083526). The author's blunt phrasing was that athletes could choose sodium intake according to taste preference rather than physiological need. If a competitive footballer does not strictly need targeted sodium replacement, the case for two high-sodium sachets during an office day is thin.

On the other side of the ledger, drinking large volumes of plain water faster than you lose it can dilute blood sodium, which is the mechanism behind exercise-associated hyponatraemia. The 3rd International Exercise-Associated Hyponatremia Consensus Development Conference concluded that drinking to thirst, rather than to a schedule, is the sensible general strategy for most people (Hew-Butler and colleagues, 2015, DOI: 10.1136/bjsports-2015-095004). Thirst is a better instrument than arithmetic for most of us, most of the time.

Electrolyte Drinks Versus Plain Water Versus Food

A quick way to hold the three in your head.

• Plain water is the default and is enough for the large majority of days for the large majority of people. It costs nothing and carries no sodium load.
• Food is where almost all of your minerals should come from, and it delivers them in the right proportions without you having to calculate anything. A banana, a jacket potato, a handful of almonds and a yoghurt will out-mineral any sachet.
• Electrolyte drinks are a tool for specific circumstances: heavy sustained sweating, heat, illness with fluid loss, or a period where food intake has genuinely collapsed. Used for those, they are excellent. Used as a daily flavoured habit, they are mostly salt and sugar with good branding.

A Few Cautions Worth Knowing

Speak to your GP or pharmacist before using electrolyte products regularly if any of these apply to you.

• Kidney disease of any stage. Impaired kidneys cannot clear potassium and sodium the way healthy ones do, and this is the single most important reason to check first.
• High blood pressure or heart failure. Added sodium works against what you and your clinician are trying to achieve.
• Blood pressure medicines. ACE inhibitors, angiotensin receptor blockers and potassium-sparing diuretics all raise blood potassium in their own right.
• Pregnancy and breastfeeding. Fluid and mineral needs shift, and it is worth getting individual advice rather than following general hydration content.
• Diabetes. The sugar in some sports drinks is not trivial, especially at two servings a day.
• Ongoing vomiting or diarrhoea. A pharmacy oral rehydration sachet is the right product, and persistent symptoms need medical attention rather than a hydration purchase.

Food supplements should not replace a varied, balanced diet or medical advice, and they are not a substitute for talking to a clinician about symptoms that are bothering you.

What to Realistically Expect

If you are genuinely short on fluid and sodium after heavy sweating, an electrolyte drink will make you feel better fairly quickly, and that experience is real. If you are adequately hydrated and eating normally, a second sachet will do very little that a glass of water and a decent meal would not have done, and it will quietly add salt and sugar to your day. That is not a criticism of the product category. It is just the honest boundary of what it does.

My own rule, for what it is worth, is that if I cannot name the reason I am reaching for the second one, I do not need the second one.

Shop Magnesium Glycinate 3-in-1

Frequently Asked Questions

Is it OK to drink electrolytes every day?

For most healthy adults, yes, provided the sodium content is modest and you account for it within your overall salt intake. A daily low-sodium serving is unremarkable. A daily habit of two high-sodium servings on top of a typical British diet is worth reconsidering, particularly if blood pressure is something you monitor.

How much sodium is in a typical electrolyte sachet?

Anywhere from about 200 mg to over 1,000 mg per serving, which is a fivefold range across products sitting on the same shelf. Since 1 g of sodium equals 2.5 g of salt, a 1,000 mg sachet contributes 2.5 g of salt against a UK daily maximum of 6 g. Check your specific product rather than assuming.

Can you have too many electrolytes in one day?

In a healthy adult with normal kidney function it is difficult to reach a dangerous level from drinks alone, because the kidneys excrete the surplus. The realistic issues are a high ongoing sodium load affecting blood pressure over time, loose stools from magnesium, and bloating or water retention from a large sodium hit. People with kidney disease or on certain blood pressure medicines are in a different position and should seek individual advice.

Are electrolyte drinks better than water for hydration?

Not usually. When 13 beverages were compared for fluid retention two hours after drinking, sports drinks performed no better than plain still water, while oral rehydration solution and milk did better (Maughan and colleagues, 2016). Electrolyte drinks come into their own during heavy sustained sweating or fluid loss through illness, not during an ordinary day.

Should I take electrolytes if I am eating much less than usual?

It can help, but the shape of the product matters. Most sachets are sodium-heavy because they are designed for sweat losses, whereas the minerals that fall away fastest when food volume drops are usually potassium and magnesium. Making each mouthful of food count for more, and taking a dedicated mineral where there is a specific gap, is generally more useful than doubling a sodium-led drink.

How much magnesium is in an electrolyte drink?

Typically 50 mg to 100 mg per serving, against a UK nutrient reference value of 375 mg used on labels. Two servings will not meet your daily magnesium requirement. If magnesium is what you are actually after, a dedicated magnesium supplement is the more direct route.

What are the signs I am overdoing electrolytes?

Persistent puffiness in the hands, feet or face, unexplained thirst, a scale reading that jumps overnight, or loose stools shortly after taking a magnesium-containing product. None of these are emergencies in a healthy adult, but all of them are a reason to read the label and cut back rather than push on.

The Bottom Line

Two electrolyte drinks a day is too much or perfectly reasonable depending entirely on what is in them and why you are drinking them. Find the sodium figure, convert it to salt, and set it against the 6 g daily maximum alongside everything else you eat. If you are sweating hard, working in heat, unwell, or eating very little, two servings can be exactly right. If you are at a desk on a normal diet, one modest serving, or plain water and a decent meal, will serve you better.

You can browse everything we have published on minerals, dosing and label reading at the supplement guides hub, or start from the Pure Vitamins home page. If magnesium is the mineral in question, our guide to choosing a magnesium supplement in the UK covers the forms and the label maths, and what magnesium is good for muscle function looks at the muscle side specifically. And if your question is when to drink them rather than how many, are electrolytes better morning or night works through the timing, while should I take electrolytes during weight loss answers the prior question of whether you need them at all while eating less.

Every Pure Vitamins formula is formulated in the UK and tested for purity and heavy metals at our GMP-certified facility, so the number on the label is the number in the capsule.

Dr. Miron, Founder of Pure Vitamins UK

Sources

• Huang L and colleagues (2020). Effect of dose and duration of reduction in dietary sodium on blood pressure levels: systematic review and meta-analysis of randomised trials. BMJ. DOI: 10.1136/bmj.m315
• Filippini T and colleagues (2021). Blood Pressure Effects of Sodium Reduction: Dose-Response Meta-Analysis of Experimental Studies. Circulation. DOI: 10.1161/CIRCULATIONAHA.120.050371
• Maughan RJ and colleagues (2016). 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. DOI: 10.3945/ajcn.115.114769
• Baker LB (2017). Sweating Rate and Sweat Sodium Concentration in Athletes: A Review of Methodology and Intra/Interindividual Variability. Sports Medicine. DOI: 10.1007/s40279-017-0691-5
• McCubbin AJ (2022). Modelling sodium requirements of athletes across a variety of exercise scenarios. European Journal of Sport Science. DOI: 10.1080/17461391.2022.2083526
• Hew-Butler T and colleagues (2015). Statement of the 3rd International Exercise-Associated Hyponatremia Consensus Development Conference. British Journal of Sports Medicine. DOI: 10.1136/bjsports-2015-095004
• NHS, Salt: the facts. UK adult guidance of no more than 6 g of salt a day.
• Expert Group on Vitamins and Minerals (2003), Safe Upper Levels for Vitamins and Minerals, Food Standards Agency. Guidance levels for supplemental magnesium and potassium.
• GB Nutrition and Health Claims Register, authorised function claims for magnesium and potassium.

This product is a food supplement and should not be used as a substitute for a varied, balanced diet or a healthy lifestyle. It is not medical advice. If you have a health condition, are pregnant or breastfeeding, or take prescribed medicines, speak to your GP or pharmacist before starting any supplement.