Which supplements really help with weight loss and which are just marketing. Scientific evidence, safety and recommendations for athletes.

There is no magic pill for weight loss. No supplement will replace a calorie deficit, but some supplements can MAKE the process EASIER: increase metabolism by 3-5%, reduce appetite, improve fat oxidation. For athletes, it is important to lose weight without losing muscle mass and strength — this requires a specific approach.
| Supplement | Mechanism of Action | Real Effect | Safety | Worth It? |
|---|---|---|---|---|
| Protein (WPC/WPI) | Satiety, muscle protection during a deficit | 2-4 kg per 12 weeks (with a calorie deficit) | Safe | ★★★★★ |
| Caffeine | Thermogenesis, appetite suppression | +3-5% to metabolism, short-term | Safe | ★★★★ |
| Green tea extract | EGCG + caffeine synergy, fat oxidation | Additional 50-100 kcal/d. | Caution (for the liver) | ★★★★ |
| Glucomannan | Fiber that expands in the stomach — satiety | 1-2 kg per 8 weeks | Safe | ★★★ |
| L-Carnitine | Fatty acid transport into mitochondria | Minimal or none (study data conflicting) | Safe | ★★ |
| Fat burners ("fat burners") | Stimulant blend | Often too low doses, ineffective | Risky | ★ (avoid) |
Protein 2.0-2.4 g/kg + Creatine 5 g/d. During a calorie deficit, protein requirements INCREASE. Creatine helps maintain strength. These are the two most important things for an athlete losing weight.
Caffeine 200 mg before morning cardio (on an empty stomach) + Green tea extract 500 mg. This combination can increase fat oxidation during exercise.
Glucomannan 1 g before a meal + Protein (as snacks). Glucomannan expands in the stomach (drink with plenty of water!). Protein provides the longest-lasting satiety of all macronutrients.
B vitamins + Magnesium + Iron (if deficient). A calorie deficit can cause fatigue. B vitamins and magnesium help maintain energy levels.