Vitamin B Complex
also known as B Complex, B vitamins
A family of eight water-soluble vitamins that work together — B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxine), B7 (biotin), B9 (folate), and B12 (cobalamin). Each has its own role, but they're often deficient together, particularly in stress, alcohol use, restricted diets, and aging. B-complex supplements provide all eight as a unit.
- Provides all eight B vitamins together, recognizing that they work as a coordinated system
- Supports energy production at the cellular level — most B vitamins are cofactors in turning food into ATP
- Supports nervous system function, including nerve signal transmission and neurotransmitter production
- Supports the production of red blood cells and the building blocks of DNA
- Often used during periods of high stress, recovery from illness, or restricted eating
- Methylation support — folate, B12, and B6 are central to the body's methylation cycle, which affects detoxification, DNA repair, and neurotransmitter balance
- Most B vitamins are not stored in the body and need regular intake — water-soluble and excreted when in excess
Causes bright yellow urine — harmless, just excess riboflavin (B2) being excreted
High-dose niacin (B3) causes flushing, itching, and at higher doses can stress the liver
B6 toxicity from very high long-term doses can cause nerve damage — usually from supplementation, not food
Folic acid (synthetic B9) at high doses can mask vitamin B12 deficiency
Use caution with levodopa (Parkinson's medication) — B6 affects how it works
Use caution with anti-seizure medications — some interact with B vitamins
Look for methylated forms (methylfolate, methylcobalamin, P5P) for people with MTHFR variants who don't convert standard forms efficiently
Whole-food sources of B vitamins are usually preferable to high-dose supplements except for specific deficiency states
You might also explore