On social media and in countless advertisements, dietary supplements are everywhere. Protein powders, creatine, vitamins, energy boosters… These products promise quick results, improved performance during your Kinomap sessions, better recovery, or faster muscle gain.
But between proven effectiveness and mere marketing hype, how can you tell the difference? And most importantly, what are the potential risks you should be aware of before taking them?
Why do athletes take dietary supplements?
An athlete’s nutritional needs are higher than those of a sedentary person. Regular physical activity increases energy expenditure, works the muscles, accelerates cellular turnover, and generates more oxidative stress (an imbalance between free radicals and antioxidants). To meet these demands, many turn to dietary supplements, which are intended to support performance and optimize recovery.
1) The main reasons for taking dietary supplements are:
a) To compensate for losses and prevent deficiencies
Training can lead to increased loss of minerals (such as magnesium, sodium, or potassium) and higher requirements for protein, iron, or B vitamins. Supplements can help maintain nutritional balance and prevent muscle issues such as cramps and fatigue.
b) To improve muscle recovery
After exercise, the body needs to rebuild muscle fibers and replenish glycogen stores. Protein powders or amino acids (BCAAs) are used to speed up muscle regeneration and reduce soreness. Proper recovery promotes faster progress!
c) To optimize performance
Some dietary supplements have been the subject of scientific studies confirming improvements in physical performance. This is the case for creatine (increasing muscle strength and power), caffeine (enhancing alertness and endurance), and beta-alanine (reducing muscle fatigue during intense efforts).
d) To support personal goals
Every athlete has their own goals: muscle gain, weight loss, competition preparation, or maintaining fitness. Some supplements are tailored to these specific contexts, such as protein for muscle building.
e) To make things more convenient
It is not always easy to prepare balanced meals or to consume enough protein and micronutrients (vitamins, iron, magnesium…). Dietary supplements then offer a practical and quick solution, especially in the form of powders or capsules.
Risks not to be overlooked
While dietary supplements can support performance or recovery, their use is not without risks. Improper, excessive, or unsuitable consumption can have health consequences.
2) Key points to watch out for:
a) The risk of overdose
An excess of nutrients—especially protein, fat-soluble vitamins (A, D, E, K), or minerals (iron, zinc, magnesium)—can overload the kidneys and liver, cause digestive issues, or lead to metabolic imbalances.
- Excess protein = dehydration and kidney strain
- Excess vitamin A = headaches, nausea, and even liver damage
b) Interactions between supplements and medications
Some supplements can interact with medications or amplify their effects.
- Caffeine can raise blood pressure
- Omega-3s can increase bleeding, especially in people taking anticoagulants
⚠️It is very important to inform your doctor or pharmacist before taking any supplements.
c) Poor product quality
The dietary supplement market is not always well-regulated, especially online. Some products contain prohibited or undeclared substances (steroids, hormones, stimulants), exposing athletes to health risks or a positive doping test.
To minimize these risks, it is recommended to choose reputable brands certified by quality labels, such as Informed Sport.
d) The risk of dietary imbalance
Excessive use of supplements can create a false sense of nutritional security. This approach may reduce the overall quality of the diet, whereas whole foods provide much more than isolated nutrients (fiber, antioxidants). Dietary supplements should support—not replace—a balanced diet.
Key takeaways
Dietary supplements can never replace a healthy lifestyle, adequate sleep, or a balanced diet. They may be useful in specific cases:
- In confirmed deficiencies (e.g., iron or vitamin D)
- For specific athletic goals approved by a healthcare professional or sports nutritionist
Before taking supplements, it is therefore essential to:
- Conduct a nutritional assessment
- Choose certified products
- Seek advice from a professional
Chloé Masson
Nutrition Project Manager
chloemasson.nutrition@gmail.com
See previous nutrition articles :
IS THE KETOGENIC DIET A GOOD OR BAD IDEA FOR ATHLETES ?
VEGETARIAN DIET FOR ATHLETES : IS IT POSSIBLE ?
THE IMPACT OF ULTRA-PROCESSED FOOD ON YOUR BODY