💊 What it does
A B-complex supplement provides all eight B vitamins in a single formulation: B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxine), B7 (biotin), B9 (folate), and B12 (cobalamin). B vitamins work as a team — many are cofactors for the same biochemical pathways, particularly energy metabolism and one-carbon metabolism. Taking them together in balanced amounts avoids the imbalances that can arise from high-dose individual B vitamin supplementation. A B-complex is particularly useful as an insurance policy for plant-based eaters who may be low in B12, riboflavin, and potentially B6.
👤 Who needs it
Vegans and plant-based eaters wanting broad B-vitamin coverage. People under high stress (B vitamins are depleted by cortisol). Heavy alcohol drinkers (alcohol depletes multiple B vitamins). Older adults with declining absorption. People taking metformin (depletes B12 and folate). Those with MTHFR variants (look for methylated B-complex with methylcobalamin + methylfolate).
🥦 Food sources first
B vitamins are found throughout plant foods but in varying amounts. Best sources: nutritional yeast (comprehensive B-vitamin profile including B12 when fortified), wholegrains, legumes, leafy greens, nuts, seeds, and fortified foods. However, B12 from food is unreliable for strict vegans.
🗓 When to supplement
As a convenient all-in-one B-vitamin supplement. For vegans wanting broader B-vitamin coverage beyond standalone B12. During periods of high stress or illness.
🏷 Best form to look for
Look for methylated B-complex containing methylcobalamin (B12) and methylfolate (5-MTHF) rather than cyanocobalamin and folic acid — superior for people with MTHFR variants and generally better retained. Avoid mega-dose B6 formulations (above 10 mg B6/day long-term).
⏰ When to take it
Morning with food. B vitamins are water-soluble — taking with breakfast is conventional. Note: riboflavin (B2) will turn urine bright yellow — harmless and expected.