Creatine and heatwaves: should you adjust your intake in the summer?

When temperatures rise, training habits change. We sweat more, drink more, and hydration becomes a central concern.

For athletes who take creatine, a question often arises:

Should I continue taking creatine when it's very hot?

The question is all the more common as creatine is sometimes accused of causing dehydration or promoting cramps. In this context, the association between creatine, heat, and sweating can seem worrying.

However, available scientific data do not show that creatine increases the risk of dehydration in people who exercise.

On the contrary, some research conducted in hot or strenuous conditions has even studied its potential benefit for maintaining hydration and thermoregulation.

So, should you change your creatine intake during the summer? And most importantly, what precautions should you take when training in high heat?

Does creatine dehydrate you when it's hot?

No, scientific data does not show that creatine increases the risk of dehydration.

This misconception mainly comes from the fact that creatine increases the amount of creatine stored in muscles and can lead to an increase in intracellular water retention.

In other words, more water is stored inside muscle cells.

But intracellular water retention and dehydration are not synonymous.

Dehydration corresponds to a significant loss of body water sufficient to disrupt the body's fluid balance. The fact that creatine increases the water content in muscle cells does not mean that it "removes" water from the rest of the body.

Studies conducted on athletes have not confirmed the hypothesis that creatine supplementation promotes dehydration, cramps, or heat-related problems.

This distinction is essential in summer.

Creatine can increase the water stored in muscles without dehydrating the body.

 

Why does this misconception exist?

To understand the confusion, we need to go back to the early years of creatine's popularization.

Since supplementation can lead to an increase in body weight, particularly due to an increase in intracellular water, the hypothesis of a disturbance in fluid balance has long been put forward.

Another confusion comes from the association between creatine and water retention.

In common parlance, "water retention" often evokes swelling, edema, or excess fluid.

The situation is different with creatine.

Part of the additional water associated with supplementation is stored in the muscle, in connection with the increase in muscle creatine stores.

This change is particularly visible at the beginning of supplementation, when muscle stores increase rapidly.

It should therefore not be interpreted as a sign of dehydration.

 

What really happens when you take creatine?

Creatine is naturally present in the body and in certain foods, particularly animal products.

It is mainly stored in muscles in the form of free creatine and phosphocreatine.

Phosphocreatine participates in the rapid regeneration of ATP, the primary source of energy directly usable by muscle cells during intense and short-duration efforts.

Regular supplementation helps to increase muscle creatine stores.

This increase can help improve the ability to repeat intense efforts and, combined with appropriate training, promote gains in strength and muscle mass.

But creatine also plays a role in the fluid balance of the muscle cell.

When muscle creatine stores increase, intracellular water can also increase.

This is one of the reasons why a weight gain of a few hundred grams to a few kilograms may be observed in some people at the beginning of supplementation.

This initial gain is therefore not necessarily related to an increase in fat mass.

 

Should you stop creatine in summer?

In most cases, no.

There is no general recommendation for athletes to stop creatine during the hotter months.

Daily supplementation with creatine monohydrate can therefore be continued when temperatures rise.

It is also not necessary to automatically reduce the dose simply because it is hot.

The strategy generally used in adults is a regular intake of about 3 to 5 g of creatine per day, with no need to change this amount based on outdoor temperature.

What must, however, be adapted to summer conditions is hydration management.

Because while creatine is not responsible for dehydration, heat does increase fluid losses.

 

Creatine and sweating: what to watch out for

When it's hot, the body increases sweat production to dissipate heat.

This adaptation is essential to maintain a body temperature compatible with continued effort.

But sweating leads to losses of water and electrolytes, especially sodium.

These losses can become particularly significant when several factors combine:

• high temperature;
• high humidity;
• prolonged training;
• high intensity;
• low heat acclimatization;
• naturally abundant sweating.

In this context, the main challenge is not to modify creatine intake, but to correctly compensate for losses related to sweating.

For a short weightlifting session, drinking according to thirst and maintaining a normal diet can generally be sufficient.

For a long or very intense workout performed in high heat, the needs may be different. Water, but also electrolytes, particularly sodium, then become more important.

 

How to take creatine when it's hot?

The strategy remains very simple: do not unnecessarily change your supplementation, but adapt your hydration to the conditions of practice.

1. Continue your daily intake

Creatine works through the progressive saturation of muscle stores.

It is therefore not necessary to change your intake based on the weather.

A regular intake of 3 to 5 g per day is the most common strategy.

2. Hydrate more if you sweat more

There is no universal amount of water to drink during the summer.

Needs depend particularly on weight, activity, duration of effort, temperature, and individual sweating rate.

Urine color, thirst sensation, and weight changes before and after a session can help better understand hydration needs.

3. Consider electrolytes during prolonged efforts

For a long session or one performed in particularly hot conditions, replacing only water may not be enough to compensate for sodium losses due to sweating.

A drink providing electrolytes can then be relevant, especially for athletes who sweat a lot.

However, the strategy must remain individualized: sweat losses can vary considerably from person to person.

 

Does heat change creatine needs?

To date, there is no evidence to suggest that high heat requires a systematic increase or decrease in the daily dose of creatine.

Outdoor temperature does not alter the functioning principle of creatine: its benefit relies on increasing and then maintaining muscle creatine and phosphocreatine stores.

However, heat can indirectly modify the context in which creatine is used.

Training performed at 30°C with significant sweating does not necessarily require more creatine, but it may require particular attention to:

• hydration;
• sodium and other electrolyte intake;
• duration and intensity of effort;
• recovery after the session;
• progressive heat acclimatization.

Therefore, it is more about the training environment that needs to be considered than creatine itself.

 

Creatine and high heat: what about cramps?

The fear of cramps is often associated with creatine, especially when used during hot periods.

However, available data do not show that creatine supplementation systematically increases the risk of muscle cramps.

On the contrary, several studies conducted on athletes, particularly in demanding conditions, have not observed more cramps or heat-related problems in people taking creatine.

However, two things must be distinguished.

Creatine supplementation does not replace a strategy adapted to the effort. It cannot alone compensate for insufficient hydration, significant sodium losses, or excessive heat exposure.

If cramps appear during a summer session, creatine should not be automatically blamed.

Effort duration, muscle fatigue, intensity, hydration, environmental conditions, and training habits can also play a role.

 

Should you drink more water with creatine in summer?

It would be tempting to give a precise amount of water to drink simply because one is taking creatine.

However, this would be too simplistic.

There is no scientific reason to impose an excessive water intake on people taking creatine.

Hydration needs should rather be adapted to the situation: temperature, effort duration, intensity, sweating, and eating habits.

In practice, a 45-minute weightlifting session in a properly ventilated gym does not present the same constraints as a two-hour endurance training session in direct sunlight.

In the latter case, losses can be considerable and require a more structured rehydration strategy.

Drinking more because it's hot, yes. Drinking excessively solely because you're taking creatine, no.

 

What if you train in direct sunlight?

When temperatures are high, the first reflex should not be to modify your supplementation, but to modify training conditions if necessary.

Several strategies can limit heat stress:

• train during the coolest hours;
• choose a shaded or air-conditioned environment;
• temporarily reduce intensity if conditions become difficult;
• plan for sufficient drinks;
• adapt breaks and recovery times;
• gradually acclimatize as heat exposure increases.

This last strategy is particularly interesting for athletes who need to compete in a hot environment.

The body can gradually improve its ability to dissipate heat and maintain its fluid balance through repeated and progressive exposure.

 

Creatine in summer: the main mistakes to avoid

Systematically stopping creatine

There is no general reason to interrupt creatine supplementation simply because temperatures rise.

Automatically reducing the dose

Heat alone does not justify reducing the usual daily dose.

Drinking excessively "to eliminate creatine"

Creatine is not a substance that needs to be "eliminated" by excessive drinking.

Disproportionate water consumption can itself become problematic, especially during prolonged endurance efforts.

Forgetting sodium

When sweating a lot, water is not the only element lost.

Sodium is the main electrolyte lost in sweat. During long or very hot efforts, its consideration can therefore be important for maintaining fluid balance.

 

Creatine and summer: should you change your habits?

In most cases, the answer is simple: no for creatine, yes for hydration if conditions require it.

Regular supplementation of 3 to 5 g of creatine per day can be continued during the summer without the need to automatically modify the dose.

Creatine is not considered a cause of dehydration, and available data do not show that it increases the risk of cramps or heat-related complications in healthy athletes.

However, high heat increases fluid and electrolyte losses due to sweating.

It is therefore necessary to adapt your strategy to your activity and your sweating level, particularly during prolonged efforts.

Creatine does not become less interesting because it is hot. In summer, the main challenge is to correctly manage hydration and electrolyte losses.

 

In summary

• Creatine does not cause dehydration in healthy athletes.
• The increase in muscle intracellular water associated with creatine does not mean that the body is dehydrated.
• It is not necessary to systematically stop or reduce creatine intake in summer.
• A daily intake of 3 to 5 g is generally sufficient.
• Heat, however, increases water and sodium losses through sweating.
• During long efforts or those performed in high heat, hydration and electrolytes require special attention.
• Needs should be adapted to the duration of the effort, the environment, and individual sweating.