Quest Mega B 100 contains vitamin B5, required for the initial stages of the synthesis of steroid hormones that govern the stress response. It also contains Vitamin B6, required for the synthesis of brain chemicals that regulate mood. The B-vitamins as a group are integral to energy metabolism and nervous system function. It may help the body to manage the effects of elevated stress levels and fatigue. High carbohydrate diets and physical activity increase the requirement for B Vitamins. This formula contains 8 B Vitamins, plus Choline, Inositol and PABA. It is a patented, timed release tablet - designed to release nutrients over 6 hours and minimises wastage of water-soluble vitamins. It is Yeast free, and suitable for vegetarians and vegans.