B₁

B₆

B₁₂

Only bacteria and similar microorganisms are capable of synthesizing vitamin B₁₂. However this vitamin can be found in animal derived products. Eggs and milk contain vitamin B₁₂. Supplementation or food enrichment are alternate ways of obtaining vitamin B₁₂

C

Vitamin C is an antioxidant that does most of its work outside of cell walls. Vitamin C and Vitamin E enhance each other's antioxidant effects.