Quest Mega B 50 contains Vitamin B5, which is 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. They can help the body to manage the effects of everyday stress. This formula contains 8 B Vitamins, plus Choline, Inositol and PABA. It is a quick release tablet, designed to release nutrients within 30 minutes. It is Yeast free and is also suitable for vegetarians and vegans.