B-Complex #6 includes essential B vitamins. Its extra B6 is important for neurotransmitter synthesis, which is essential for healthy stress response and mood support.* It can also help modulate fluid retention.* Most B vitamins, with the exception of vitamin B12, are not stored in the body; consequently, they must be acquired daily from the diet in order to maintain optimal health.* Thorne's B-Complex #6 contains an optimal balance of essential B vitamins with extra vitamin B6. B-Complex #6 contains thiamine (vitamin B1), riboflavin and riboflavin 5'-phosphate (vitamin B2), niacinamide (vitamin B3), pantothenic acid (vitamin B5), pyridoxine and pyridoxal 5'-phospate (vitamin B6), methylcobalamin (vitamin B12), methyl-folate (5-MTHF), and biotin.