What Are B-Group Vitamins?
B-group vitamins are 8 water-soluble vitamins (B1, B2, B3, B5, B6, B7, B9, B12) that act as coenzymes in energy metabolism. Each performs a unique function, but together they form a complex system necessary for converting macronutrients into energy. For athletes, B vitamins are especially important because their requirement increases in proportion to calorie intake.
📊 All B-Group Vitamins
| Vitamin | Name | Function in sport | RDA | Sources |
|---|---|---|---|---|
| B1 | Thiamine | Carbohydrate metabolism, nervous function | 1.1-1.2 mg | Pork, sunflower seeds, whole grains |
| B2 | Riboflavin | Electron transport chain (ATP production) | 1.1-1.3 mg | Eggs, milk, almonds |
| B3 | Niacin | NAD+/NADH production, fat metabolism | 14-16 mg | Chicken, tuna, peanuts |
| B5 | Pantothenic acid | Coenzyme A production, fatty acid oxidation | 5 mg | Avocados, mushrooms, sweet potatoes |
| B6 | Pyridoxine | Amino acid metabolism, glycogen breakdown | 1.3-1.7 mg | Bananas, chicken, potatoes |
| B7 | Biotin | Gluconeogenesis, fatty acid synthesis | 30 μg | Eggs, salmon, nuts |
| B9 | Folic acid | DNA synthesis, red blood cells | 400 μg | Leafy vegetables, lentils, liver |
| B12 | Cobalamin | Red blood cell production, nerve myelination | 2.4 μg | Meat, fish, milk, eggs |
🏋️ B Vitamins and Sports Performance
⚡ Energy Production
B1, B2, B3 and B5 are essential for converting carbohydrates, fats and proteins into ATP energy. Without them, even a sufficient amount of food cannot be used efficiently for energy.
🩸 Oxygen Transport
B9 (folic acid) and B12 are essential for red blood cell production. Their deficiency causes megaloblastic anemia — endurance and VO2max decrease.
💪 Muscle Function
B6 participates in glycogen phosphorylase activity (glycogen breakdown) and amino acid metabolism. During intense training, the need for B6 increases.
🧠 Nervous System Support
B1, B6 and B12 are critically important for nerve conduction and neurotransmitter synthesis. Their deficiency can cause peripheral neuropathy and impair coordination.
📋 Intake Recommendations
- For athletes: Recommended to take a B complex, not individual B vitamins (except for specific deficiencies)
- Timing: Best in the morning or before training with food. B vitamins can increase energy — avoid before sleep
- For vegans: B12 supplements are essential — plant products do not contain active B12
- High protein: If you consume >2.0 g/kg protein, consider a higher B6 dose (up to 5-10 mg)
- During competition: B12 injections are not a miracle — if you do not have a deficiency, additional B12 will not improve results
🛒 Recommended Products
❓ FAQ
Can B Vitamins Increase Energy Before Training?
Yes, but only if you have a deficiency. If your B-vitamin levels are normal, an additional dose will not cause a direct energy boost. They act as catalysts — needed for the process, but an excess does not speed up the process.
Are B12 injections better than tablets?
Injections are only needed in case of absorption disorders (pernicious anemia, stomach surgeries). For healthy people, oral B12 (especially methylcobalamin form) is sufficiently effective.
Can B6 improve sleep?
Paradoxically, yes. B6 is essential for the synthesis of melatonin and serotonin. 10-25 mg of B6 before sleep (part of ZMA composition) can improve sleep quality and increase dream intensity.