Advanced Absorption Mega-B RED Advanced Absorption Mega-B RED is a 2-1 formula that is not only packed with all the essential B vitamins to help you meet and exceed your daily requirements – it also delivers a potent Nitric Oxide Boost to help optimize performance.* Whole-Body Nutrition: B vitamins are essential to life* and play critical roles in numerous biochemical reactions throughout the body. They are essential to metabolism, energy production, and in the maintenance of a healthy nervous system.* Nitric Oxide Boost: L-Citrulline is an amino acid that readily converts to L-Arginine in the body.* L-Arginine can then be converted into Nitric Oxide.* Nitric Oxide occurs naturally in the body and plays a key role in cardiovascular health.* It helps blood vessels relax and dilate, allowing more blood to flow throughout the body.