Start taking creatine and someone tells you to double your water intake.
Increase your protein and suddenly you're warned that you need to drink constantly.
Take pre-workout and you'll hear that caffeine is dehydrating you before you've even reached the gym.
It creates the impression that every new supplement needs to be matched with another bottle of water.
Usually, it doesn't.
Your body doesn't calculate its hydration requirements by counting the tubs and capsules in your kitchen cupboard.
Fluid needs are influenced by a much bigger picture:
- your body size
- how physically active you are
- how much you sweat
- temperature and humidity
- what you eat and drink
- illness and other individual circumstances
Some supplements can affect fluid balance or make hydration particularly relevant, but that isn't the same as saying taking supplements automatically means you need to drink significantly more water.
Creatine is perhaps the best example. It has a relationship with water inside muscle, yet that has produced a persistent myth that creatine inherently dehydrates you.
Protein gets similar treatment.
And caffeine is frequently described as though every coffee or pre-workout immediately leaves you with a fluid deficit.
The reality is more useful—and considerably less dramatic.
Here's what actually happens.
1. Do You Need to Drink More Water When Taking Supplements?
Not simply because you're taking supplements.
If you begin taking a daily multivitamin tomorrow, there's no universal rule stating that you suddenly need another litre of water every day.
The same principle applies to many common sports supplements.
Instead, separate two questions:
How much fluid do you need overall?
and:
Does this particular supplement meaningfully change that requirement?
They're not the same thing.
Someone training for 90 minutes in a hot gym and sweating heavily may require substantially more fluid than they do on a sedentary rest day.
That's true whether they take five supplements or none.
Likewise, someone exercising outdoors during a UK heatwave may need to pay considerably more attention to hydration than they did during a cool winter session.
Food contributes water too.
So do drinks other than plain water.
Your total hydration therefore isn't determined exclusively by how many glasses of water you drink.
Supplements should fit within that wider picture.
Products that are mixed with water obviously contribute fluid themselves. Applied Nutrition Hydration Powder – 240g, for example, is prepared as a drink according to its directions rather than somehow creating a completely separate water requirement on top of the fluid used to consume it.
The goal is appropriate hydration, not maximum water consumption.
2. Can Supplements Affect How Much Water Your Body Needs?
Some can influence aspects of fluid balance, but the effect depends entirely on what you're taking.
That's why the phrase:
"Supplements make you need more water"
isn't particularly helpful.
Consider how different these products are:
Creatine can increase creatine stored within muscle and is associated with changes in intracellular water.
A caffeinated energy product can contribute caffeine while also potentially providing fluid itself.
An electrolyte drink provides fluid alongside minerals such as sodium.
Protein powder contributes protein and, when mixed as a shake, fluid.
A vitamin capsule may have no meaningful effect on your daily fluid requirement at all.
They're all called supplements, but physiologically they're completely different.
Your circumstances can matter more than the supplement itself.
Suppose you start using a sports supplement at exactly the same time as beginning a demanding summer training programme.
You're now training five days per week, sessions are longer and you're sweating considerably more.
You might genuinely need more fluid.
But it would be misleading to conclude:
"The supplement made me need all this extra water."
Your training changed too.
Whenever your hydration needs seem different, look at the entire situation rather than automatically blaming—or crediting—the newest tub in your cupboard.
3. Do You Need to Drink More Water When Taking Creatine?
You should stay appropriately hydrated while taking creatine.
That doesn't mean creatine users need to force down enormous quantities of additional water.
This myth partly comes from what creatine actually does.
Supplementation can increase creatine stored within skeletal muscle, and increases in muscle creatine are associated with increased water within muscle.
That's very different from the popular claim that creatine:
"Pulls water out of the rest of your body and into your muscles."
That description makes it sound as though your muscles are stealing water from your organs.
It isn't a useful representation of what happens.
Research in healthy people hasn't supported the idea that appropriate creatine supplementation inherently causes dehydration during exercise.
So if you're using Applied Nutrition Creatine 3000 – 120 Caps, you don't need to invent an extreme water target purely because creatine is now part of your routine.
Instead:
Drink appropriately throughout the day.
Increase fluid intake when activity, sweating and environmental conditions demand it.
Follow the product directions.
And respond to your individual circumstances.
The other mistake is interpreting changes in body weight after starting creatine as evidence that something has gone wrong with hydration.
An increase in water associated with muscle can contribute to early changes in scale weight.
That's not the same thing as unhealthy fluid retention or dehydration.
4. Does a High Protein Intake Increase Your Water Needs?
This question needs an important distinction.
Protein powder isn't inherently dehydrating.
If you add a protein shake to your diet, you don't automatically need to compensate with a prescribed amount of additional water.
Your body does, however, need water for normal metabolic and excretory processes, and overall hydration remains important when consuming a higher-protein diet.
Protein metabolism produces nitrogenous waste that ultimately needs to be excreted, predominantly as urea through the kidneys.
That sometimes gets transformed online into:
"High protein destroys your kidneys unless you drink loads of water."
That's a much bigger claim.
For healthy people, consuming an appropriately structured higher-protein diet doesn't mean you need to spend the entire day forcing down water.
Something like USN Muscle Fuel Anabolic 4kg Variety Pack can contribute protein and other nutrients to someone's diet, but the presence of protein doesn't create a fixed water requirement attached to every serving.
There's also an obvious point that gets missed:
A shake is normally made with liquid.
That liquid contributes to your overall fluid intake.
Your total diet matters too.
Someone eating plenty of fruit, vegetables, yoghurt, soups and other water-containing foods is obtaining fluid differently from someone eating predominantly dry foods.
So don't calculate hydration as:
One protein shake = X extra glasses of water.
Look at your overall fluid intake, activity and environment instead.
5. Do Pre-Workout and Caffeine Make You Need More Water?
Caffeine has a reputation for being intensely dehydrating.
The reality is more nuanced.
Caffeine can have a diuretic effect, particularly in certain circumstances and at higher intakes.
But that doesn't mean every caffeinated drink causes a net loss of more fluid than you've just consumed.
Coffee still contains water.
So does tea.
And caffeinated drinks can still contribute towards total fluid intake.
For someone who regularly consumes caffeine, its effect on fluid balance also isn't necessarily the same as it would be in someone unaccustomed to it.
This becomes particularly relevant around training.
Suppose you use Applied Nutrition Body Fuel Energy Shots before a demanding workout.
You train hard for an hour.
You're hot.
You sweat heavily.
You finish considerably thirstier than when you started.
It's easy to conclude:
"The caffeine dehydrated me."
But you've also just exercised and sweated.
Those fluid losses matter.
The more useful approach is to consider:
How much caffeine are you consuming?
How much are you sweating?
How long are you training?
How hot is the environment?
Are you replacing fluid during and after exercise?
Caffeine doesn't remove the need to hydrate properly.
But neither does consuming caffeine mean you automatically need to add litres of extra water to your day.
Intermission
Taking supplements doesn't create one universal extra-water rule.
Creatine doesn't inherently mean you need to walk around carrying a four-litre bottle.
Protein powder isn't automatically dehydrating.
And caffeine-containing products don't instantly cancel out the fluid you've consumed.
Your actual hydration requirements are driven much more strongly by your body, training, sweat losses, environment and overall diet.
That's also why simply drinking more and more plain water isn't always the answer.
During prolonged exercise, heavy sweating or hot conditions, you're losing more than water.
In Part 2, we'll look at whether vitamins need lots of water, when electrolytes become more useful than simply drinking additional water, whether dehydration can make supplement-related discomfort worse, why drinking too much water can become dangerous and how to judge whether you're actually drinking enough.
Part 2
6. Do Vitamins and Minerals Need to Be Taken With Plenty of Water?
You normally need enough water to comfortably swallow the supplement.
You don't generally need to follow every vitamin or mineral capsule with several enormous glasses of water.
This is another area where two pieces of advice get mixed together:
"Take this supplement with water."
and:
"This supplement means you need more water throughout the day."
They aren't the same thing.
Taking tablets and capsules with an adequate amount of water can make them easier to swallow and help them pass down the oesophagus properly.
But once the supplement reaches your digestive system, absorption depends on considerably more than how much water you drank with it.
Some vitamins, for example, are fat-soluble.
Vitamins A, D, E and K are absorbed alongside dietary fat, which is why taking them around an appropriate meal may matter more than drinking an unusually large amount of water with them.
Water-soluble vitamins such as vitamin C and the B vitamins behave differently, but the phrase "water-soluble" doesn't mean:
"The more water you drink, the more vitamins you'll absorb."
Likewise, Applied Nutrition Multi-Vitamin Complex – 90 Capsules doesn't require you to dramatically increase your daily fluid intake simply because you're taking a multivitamin.
Use the product according to its directions and maintain normal, appropriate hydration.
More water isn't automatically more absorption.
7. When Do You Need Electrolytes Instead of Just More Water?
This is where hydration becomes more interesting.
When you sweat, you don't lose pure water.
You also lose electrolytes—particularly sodium, along with smaller amounts of other minerals.
For an ordinary day involving relatively little sweating, you generally don't need to turn every drink into an electrolyte drink.
Normal food and fluids contribute to maintaining fluid and electrolyte balance.
The situation can change when sweat losses become substantial.
Think:
Long training sessions.
Very sweaty workouts.
Training in hot conditions.
Long-duration endurance exercise.
Repeated demanding sessions where substantial sweating occurs.
In these situations, repeatedly replacing fluid with plain water while ignoring significant electrolyte losses may not always be the most appropriate strategy.
This is where something such as BetterYou Magnesium Water – Hydrate can form part of a wider hydration routine according to its directions.
But electrolytes aren't a magic upgrade to water.
Someone sitting at a desk all morning doesn't automatically need an electrolyte drink because plain water is supposedly inadequate.
Individual sweat losses also vary enormously.
Two people can complete exactly the same workout and finish with very different fluid and sodium losses.
If you're someone who finishes training with clothes completely soaked in sweat or regularly notices heavy salt residue on clothing, your hydration strategy may need to look different from someone who sweats relatively little.
The question isn't:
"Are electrolytes better than water?"
It's:
"What am I actually trying to replace?"
8. Can Drinking Too Little Water Make Supplement Side Effects Worse?
Potentially, depending on the supplement and the situation.
Dehydration itself can make you feel pretty unpleasant.
Possible symptoms can include thirst, headache, fatigue, dizziness and reduced exercise performance.
Now add a demanding workout, hot environment and several supplements into the picture.
It can become easy to blame whichever supplement you took most recently.
For example, someone takes a caffeinated energy product, trains hard in a hot gym, sweats heavily and barely drinks.
They develop a headache afterwards.
Was it definitely the supplement?
Not necessarily.
Their hydration, caffeine intake, training intensity, food intake and environmental conditions could all be relevant.
Some powdered supplements can also be uncomfortable when people ignore their mixing instructions and use far too little fluid.
And swallowing several tablets or capsules with almost no water isn't particularly sensible either.
This doesn't mean every supplement-related symptom can be fixed by drinking water.
If a product repeatedly causes unwanted effects when you're using it correctly, don't keep increasing your water intake in an attempt to make the problem disappear.
Review the supplement itself.
Check the dose and directions.
Look for overlapping ingredients between products.
And stop using it and seek appropriate professional advice if necessary.
Water isn't an antidote to inappropriate supplementation.
9. Can You Drink Too Much Water When Taking Supplements?
Yes.
This is an important counterpoint because advice about supplements and hydration often focuses exclusively on drinking more.
More isn't always better.
Your body carefully regulates the concentration of water and electrolytes within your fluids.
Consuming excessive amounts of water—particularly very large quantities over a short period—can overwhelm the body's ability to maintain that balance.
In severe cases, blood sodium can become dangerously diluted, producing a condition called hyponatraemia.
This can be medically serious.
It's one reason extreme hydration challenges and rigid instructions to consume enormous amounts of water aren't sensible.
The risk can become particularly relevant during prolonged exercise when someone is simultaneously:
sweating, losing sodium and consuming excessive amounts of plain water.
That doesn't mean you should be frightened of drinking water.
It means hydration has a useful middle ground.
Too little can be a problem.
Too much can also be a problem.
The goal is to replace fluid appropriately rather than consuming as much as physically possible.
And taking creatine, protein or vitamins doesn't override that principle.
If someone tells you that starting creatine means you now must consume five or six litres of water every day, don't blindly follow the number.
Your hydration requirements need context.
10. How Much Water Should You Drink When Taking Supplements?
There isn't one supplement-specific number that works for everyone.
In the UK, the NHS Eatwell Guide gives a useful general starting point of around 6–8 cups or glasses of fluid per day, while also recognising that people may need more when they're physically active, in hot environments, pregnant or breastfeeding, or unwell.
And importantly, that refers to fluid, not exclusively plain water.
Water is an excellent choice, but other drinks can contribute too.
Food also supplies some water.
For someone who trains regularly, your requirements may change substantially from one day to another.
A cool rest day isn't the same as:
60 minutes of hard resistance training in August.
And neither resembles:
two hours of endurance exercise with substantial sweating.
Rather than attaching an arbitrary extra litre to every supplement you take, pay attention to practical hydration cues.
Thirst
Thirst is an obvious signal that shouldn't routinely be ignored.
Urine Colour
Urine colour can provide a rough everyday indication of hydration.
Consistently very dark urine can suggest you need more fluid, although urine colour can also be affected by other factors—including certain supplements.
B vitamins are a particularly obvious example because they can make urine appear strikingly bright yellow.
So don't diagnose your hydration status from colour alone.
Training Conditions
Longer sessions, higher temperatures and heavier sweating generally increase fluid requirements.
Your Individual Sweat Rate
If hydration during exercise is particularly important to you, comparing body weight before and after training can help estimate how much fluid you've lost during a particular session.
You don't need to do this after every gym visit.
But it can be useful for athletes trying to understand their individual sweat losses.
The overall principle is much simpler:
Drink enough to maintain appropriate hydration without deliberately forcing excessive quantities of fluid.
Your supplements are only one small part of that equation.
Conclusion
So, do you need to drink more water when taking supplements?
Not automatically.
Starting a supplement doesn't suddenly create a universal requirement to add litres of water to your day.
Creatine can increase water associated with muscle, but that doesn't mean appropriate creatine supplementation inherently dehydrates you or requires extreme water consumption.
A higher protein intake doesn't come with a fixed number of additional glasses either.
Caffeine can influence fluid balance, but caffeinated drinks still contribute fluid—and the heavy sweating that accompanies training may be much more relevant to your hydration requirements.
Electrolytes have their place too.
When you're losing substantial fluid and electrolytes through sweat, replacing more than water can become useful. But that doesn't mean every glass of water needs an electrolyte sachet.
And crucially:
Don't confuse good hydration with maximum hydration.
Excessive water consumption can itself become dangerous.
Instead of calculating your fluid intake from the number of supplements you use, consider your activity, sweat losses, environment, diet, thirst and individual needs.
Drink appropriately.
Follow the mixing and usage directions for your supplements.
And leave the enormous four-litre water jug at home unless you genuinely need it.
FAQ
1. Do you need to drink more water when taking supplements?
Not necessarily. Most supplements don't automatically increase your daily water requirement. Your activity, sweat losses, environment, diet and individual circumstances are generally more important.
2. How much water should you drink when taking creatine?
There's no special universal amount everyone taking creatine needs to drink. Maintain appropriate everyday hydration and increase fluid intake when exercise, heat and sweat losses require it.
3. Does creatine dehydrate you?
Evidence in healthy people doesn't support the common claim that appropriate creatine supplementation inherently causes dehydration. Creatine can increase water associated with muscle, which isn't the same thing.
4. Does protein powder make you need more water?
Protein powder doesn't create a fixed additional water requirement. Maintain appropriate hydration as part of your overall diet, particularly when training regularly.
5. Does pre-workout dehydrate you?
Not automatically. Caffeine can have a diuretic effect, but caffeinated drinks can still contribute fluid. Exercise and sweat losses may be considerably more important during a workout.
6. Should you take vitamins with lots of water?
Usually, you simply need sufficient water to swallow them comfortably unless the product gives different directions. Drinking excessive water doesn't automatically improve vitamin absorption.
7. When should you drink electrolytes instead of water?
Electrolytes become more relevant when you're replacing meaningful electrolyte losses alongside fluid, such as during prolonged exercise, heavy sweating or training in hot conditions.
8. Can you take supplements if you're dehydrated?
Being dehydrated isn't something to ignore simply because you're taking supplements. Address your hydration needs appropriately, particularly before and during demanding exercise.
9. Can drinking too much water be bad for you?
Yes. Excessive water intake, particularly large quantities consumed rapidly, can dangerously dilute blood sodium and cause hyponatraemia.
10. How do you know if you're drinking enough water?
Thirst, urine colour, activity, environmental conditions and individual sweat losses can all provide useful information. There isn't one exact daily water target suitable for everyone.
