Electrolytes: Do You Actually Need Them?

Electrolytes are having a moment.

They are in tablets, powders, sachets, drinks, gels, gummies and, who knows what next, probably soon in moisturiser and dog shampoo too...

But behind the marketing, electrolytes are genuinely important.

They help the body manage fluid balance, nerve signals, muscle contraction and normal cell function. In other words, they are not just trendy little salty sprinkles. They do actual work.

The question is not “are electrolytes important?” because yes, absolutely.

The better question is: do you need to supplement them?

As always, this blog is for education only. It is not medical advice, or a recommendation that everyone should start taking electrolyte products. It is to help you decide for yourself whether they could be beneficial for you.

What are electrolytes?

Electrolytes are minerals that carry an electrical charge when dissolved in fluid.

The main ones we tend to talk about in relation to exercise are:

• sodium

• potassium

• chloride

• magnesium

• calcium

These minerals help regulate how fluid moves in and out of cells. They also support nerve messages, muscle contractions, heart rhythm, blood pressure regulation and overall hydration.

So yes, electrolytes are important.

But that does not automatically mean everyone needs a neon sachet in their water every day.

Why do active people lose electrolytes?

When we exercise, we sweat. Some are more 'efficient' sweaters than others... Yes, that'd be me, hello!

Sweat is mostly water, but it also contains electrolytes, especially sodium and chloride. Smaller amounts of potassium, magnesium and calcium are lost too.

How much you lose depends on lots of things, including:

• how much you sweat

• how salty your sweat is

• exercise intensity

• how long you exercise for

• temperature and humidity

• clothing

• fitness level

• body size

• hormones

• medication

• how well hydrated you were beforehand

Some people finish a class gently glowing. Others look like they have just had a fight with a hosepipe. Yes, hello, me again!

Both are normal. But if you are a heavy sweater, or you notice salty white marks on your clothing, stinging sweat in your eyes, or gritty salt on your skin after exercise, you may lose more sodium than average.

What do electrolytes do during exercise?

During exercise, electrolytes help the body maintain fluid balance and support normal muscle and nerve function.

This matters because not staying sufficiently hydrated can make exercise feel harder. It can affect energy, concentration, temperature regulation and perceived effort.

If fluid and sodium losses are high, replacing water alone may not always be enough. Sodium helps the body hold onto fluid more effectively and can support rehydration after sweating.

This is why electrolyte drinks can be useful in certain situations — because they help replace some of what has been lost.

When might electrolytes be useful?

For many everyday exercise sessions, especially those under an hour, in 'normal' conditions, water is usually enough.

Electrolytes may be more useful when:

• you are exercising in hot or humid conditions

• you sweat heavily

• you are doing longer sessions

• you are doing multiple classes in one day

• you are exercising at higher intensity

• you notice salty sweat marks on clothing

• you struggle with headaches or feeling wiped out after sweaty sessions

• you need to rehydrate quickly between sessions

• you are training while appetite is low

• you have recently been unwell with vomiting or diarrhoea

• you are drinking plenty but still do not feel properly hydrated after exercise

  
  

Electrolytes and hot weather

Hot weather changes the picture.

When it is warm, the body works harder to regulate temperature. We may sweat more, lose more fluid, and feel tired more quickly.

In these conditions, staying hydrated becomes more important, especially if you are active.

Electrolytes may help some people feel better during or after sweaty sessions because they replace sodium lost in sweat and encourage the body to retain fluid more effectively.

That said, electrolytes are not a free pass to ignore common sense.

In very hot weather, the basics still matter:

• arrive well hydrated

• wear light, breathable clothing

• work at your own pace

• take breaks when needed

• avoid pushing through dizziness or nausea

• sip fluids throughout rather than chugging huge amounts in one go

• cool down properly

• eat enough across the day to fuel yourself

Electrolytes can support hydration, but they do not make you heatproof.

What about cramps?

Electrolytes are often marketed as a cure for cramps.

The truth is a little less simple.

Muscle cramps during exercise can be influenced by several factors, including fatigue, training load, intensity, muscle conditioning, hydration status, sodium losses and individual susceptibility.

If cramps are related to heavy sweat and sodium loss, electrolytes may help. But they are not guaranteed to prevent cramps for everyone.

If you regularly experience cramps, it is worth looking at the bigger picture:

• are you doing more than your body is used to?

• are you fatiguing certain muscles repeatedly?

• are you eating enough?

• are you drinking enough?

• are you recovering well?

• are you warming up and cooling down properly?

• are you taking any medication that may affect fluid or electrolyte balance?

A supplement might help in some cases, but it should not be the only thing you look at.

Do you need sports drinks?

Not always.

Sports drinks usually contain fluid, electrolytes and carbohydrate. This can be useful for longer or more intense exercise, especially when energy replacement is also needed.

But for many everyday sessions, especially shorter classes, you may not need the extra sugar or calories.

Electrolyte tablets or powders often contain sodium and other minerals with little or no carbohydrate. These may be useful if the main goal is replacing salts and supporting hydration rather than fuelling long-duration exercise.

There is no single perfect option. It depends on the person, the session, the weather, the intensity, and what else you have eaten and drunk.

Food contains electrolytes too

Electrolytes do not only come from supplements.

You can get them from everyday foods and drinks, including:

• milk

• yoghurt

• bananas

• potatoes

• beans and lentils

• leafy greens

• nuts and seeds

• soups

• salted meals

• fruit and vegetables

In fact, for many people, normal meals provide enough electrolytes most of the time.

A post-class meal or snack containing fluid, carbohydrate, protein and some salt can be a perfectly good recovery option.

For example, soup and bread, yoghurt and fruit, a sandwich, beans on toast, eggs on toast, or a smoothie with milk or yoghurt may all contribute to rehydration and recovery.

Electrolytes and midlife women

Midlife can bring changes that make hydration feel a little more noticeable.

Some women experience changes in temperature regulation, sweating, sleep, energy, headaches or general heat tolerance during perimenopause and menopause.

Electrolytes are not a treatment for menopause symptoms, and they should not be marketed that way. However, for active midlife women who sweat heavily, train regularly, feel wiped out after hot classes, or struggle to rehydrate well, electrolytes may be a useful tool.

They may also be helpful if you are doing strength training, HIIT, circuits or multiple sessions across the week and want to support recovery and consistency.

When should you be cautious?

Electrolyte products are not automatically suitable for everyone.

Some contain high levels of sodium. Others contain potassium, magnesium, caffeine, sweeteners, sugar alcohols or herbal extras.

You should seek advice from a GP, pharmacist, dietitian or appropriate healthcare professional before using electrolyte supplements if you:

• have high blood pressure

• have kidney disease or reduced kidney function

• have heart disease

• have liver disease

• take diuretics or blood pressure medication

• take medication that affects sodium, potassium or fluid balance

• have diabetes and are considering sugary sports drinks

• are pregnant or breastfeeding

• have been advised to follow a low-salt diet

• are unsure whether a product is appropriate for you for any reason

If you are losing fluid through illness, such as vomiting or diarrhoea, oral rehydration salts from a pharmacy may be more appropriate than a sports drink or fitness electrolyte product.

What should you look for in an electrolyte product, or should you just DIY it?

If you choose to use an electrolyte supplement, look for something simple and clearly labelled.

Check:

• sodium content

• serving size

• sugar content

• sweeteners

• caffeine

• potassium content

• magnesium content

• unnecessary “energy” blends

• whether it is suitable for your health needs

• whether it actually tastes nice enough to drink

The most useful electrolyte during sweaty exercise is usually sodium, because that is the main electrolyte lost in sweat.

And while some people do choose to mix their own DIY sodium drink, be aware “a pinch of salt” can vary wildly, and the taste may be.... character-building! With a carefully selected supplement, there's less chance of overdoing the salt and more chance of actually enjoying it.

Potassium, magnesium, chloride and calcium also support normal fluid balance, nerve signalling, muscle contraction and heart rhythm, so a balanced electrolyte product can sometimes be more useful than a simple DIY salt drink, offering broader support when sweat losses are higher, such as during hot weather, intense classes or repeated sessions.

Be careful with anything that makes dramatic claims other than helping with hydration, such as “detoxing”, “cortisol balancing” or “cellular cleansing.” That is usually your cue to raise one eyebrow and back away slowly.

Practical ways to use electrolytes

For most active people, electrolytes are best used strategically rather than automatically.

You might consider them:

• before a very hot class if you know you sweat heavily

• during a longer or higher-intensity session

• after a very sweaty class

• between two classes on the same day

• during a heatwave

• when you have a headachey, washed-out feeling after sweating

• when plain water does not seem to help you rehydrate well

In summary

Electrolytes are important minerals that help with fluid balance, nerve signals and muscle function.

For most shorter or gentler classes, water and normal meals will usually do the job.

But if you are exercising in the heat, sweating heavily, doing longer or more intense sessions, or trying to recover between classes, electrolytes may be a useful and practical support.

They are not magic. They do not replace food, rest, sensible pacing or listening to your body.

But used appropriately, they can help some active people stay better hydrated, recover more comfortably and keep moving well.

So yes, electrolytes can be useful.

No, you do not need to panic-buy six flavours.

Hydrate sensibly, fuel properly, work at your own pace, and choose what actually supports your body.

A note on the electrolyte product I use

I’m occasionally asked which electrolyte product I personally use, so I’m including the details here for anyone who would like to take a look.

I personally currently use products from Awesome Supplements, and have regularly used their Hydrate supplement while teaching fitness classes, for the past 4 years. I genuinely find their Hydrate electrolyte powder tastes good and mixes easily into water. My favourite is the watermelon flavour. As a company, their products are positioned around evidence-informed ingredients, sensible dosing and transparent labelling, without dramatic “quick fix” or questionable claims, which is why I feel comfortable sharing their 10% discount offer with you. Just use my code ENJOY10 at the checkout for 10% off your first order at awesomesupplements.co.uk

Affiliate disclosure: this is an affiliate link, which means I may receive a small commission if you choose to buy through it. You also get 10% off using the link/code. There is no pressure at all to purchase, and you absolutely do not need this specific product to stay hydrated or enjoy your classes.

As with any supplement, electrolytes are not automatically necessary for everyone. They may be useful in certain situations, such as hot weather, heavy sweating, longer or higher-intensity sessions, or when you struggle to rehydrate well after exercise. But whether they are right for you depends on your own health, diet, activity levels, medication, sweat rate and personal preferences.

Please check the ingredients, serving guidance and suitability for yourself before using. If you have high blood pressure, kidney disease, heart disease, diabetes, are pregnant or breastfeeding, take medication, have been advised to follow a low-salt diet, or are unsure whether electrolyte supplements are appropriate for you, please speak to a GP, pharmacist or registered dietitian first.

This is simply a product I personally use and like — not a must-have, not medical advice, and definitely not a magic pouch of fitness wizardry!