The effects of B BOOST shots are usually immediate, resulting in higher energy levels and improved mood, and mental function. B BOOST plays an integral role in the metabolism of fats, particularly fatty acids that are unsaturated. It helps with the regulation and production of the thyroid, and ensures the proper functioning of the metabolism system. It is critical in proper functioning of the nervous system. It is also used to build red blood cells. It is not found in plant-based foods, so vegans and vegetarians are a higher risk for developing a deficiency.