B vitamins are a group of eight essential water-soluble vitamins that play a central role in energy production, brain function, and nervous system health. Unlike fat-soluble vitamins, your body doesn't store B vitamins well — making consistent daily intake through diet or supplementation essential.
The 8 B Vitamins and What They Do
- B1 (Thiamine): Converts carbohydrates into energy; essential for nerve function
- B2 (Riboflavin): Energy metabolism; antioxidant protection
- B3 (Niacin): DNA repair, energy production, supports cholesterol levels
- B5 (Pantothenic Acid): Hormone production, energy metabolism
- B6 (Pyridoxine): Neurotransmitter synthesis (serotonin, dopamine, GABA); immune function
- B7 (Biotin): Metabolism of fats, carbs, and proteins; hair and nail health
- B9 (Folate): DNA synthesis, cell division; critical during pregnancy
- B12 (Cobalamin): Nerve health, red blood cell formation, energy, brain function
B Vitamins and Energy
B vitamins don't directly give you energy — but they are essential cofactors in the metabolic pathways that convert food into ATP (your body's energy currency). Without adequate B vitamins, these pathways slow down, leading to fatigue, brain fog, and poor physical performance.
B Vitamins and Mental Health
B6, B9, and B12 are particularly important for mental health. They are required for the synthesis of serotonin, dopamine, and GABA — the neurotransmitters that regulate mood, motivation, and anxiety. Deficiencies in these vitamins are strongly associated with depression, anxiety, and cognitive decline.
Who Is Most at Risk of B Vitamin Deficiency?
- Vegans and vegetarians — B12 is found almost exclusively in animal products
- Older adults — absorption of B12 declines with age
- People taking metformin — this diabetes medication depletes B12
- Heavy alcohol drinkers — alcohol impairs B vitamin absorption
- People under chronic stress — stress rapidly depletes B vitamins
B12 Deficiency: A Silent Epidemic
Vitamin B12 deficiency is particularly common and particularly damaging. Symptoms include fatigue, brain fog, depression, nerve tingling, and in severe cases, irreversible neurological damage. If you're vegan, over 50, or on metformin, B12 supplementation is non-negotiable.
Methylated vs. Standard B Vitamins
Look for supplements containing methylcobalamin (B12) and methylfolate (B9) rather than cyanocobalamin and folic acid. The methylated forms are more bioavailable and are essential for people with the MTHFR gene variant — which affects up to 40% of the population.
Explore Supplarium's B-complex and B12 supplements — methylated, bioavailable, and third-party tested.