Mega b 100 is a timed release supplement that provides an excellent source of b vitamins b vitamins support normal energy yielding metabolism vitamin b1 b2 b3 pantothenic acid b6 and b12 and the reduction of tiredness and fatigue vitamins b2 b3 pantothenic acid b6 b12 the formula releases nutrients over an extended period of time for longer lasting action thiamin b1 riboflavin b2 niacin b3 vitamin b6 and vitamin b12 also contribute to the normal functioning of the nervous