Solgar - Megasorb Vitamin B12 Sublingual 2500 mcg. - 60 Nugget(s) Solgar Megasorb Vitamin B12 Sublingual 2500 mcg. Vitamin B12 is part of a group of essential nutrients known as the B Complex. It supports energy metabolism and promotes a healthy nervous system. Along with Folic Acid and Vitamin B6, it supports heart health by promoting healthy levels of homocysteine. B12 is required for the normal development and regeneration of red blood cells, which help to deliver oxygen throughout the