Vitamin B complex is recommended when stress is at a level which may risk heart disease depression insomnia or anxiety. Timed release to deliver the vitamins over a prolonged period Improved Formula Mega Complex 100 There are 8 B Vitamins in Vitamin B Complex as well as several related substances. The eight vitamins are thiamine B1 riboflavin B2 niacin B3 pyridoxine B6 cobalamine B12 folic acid pantothenic acid & biotin. The other related substances include choline inositol a