Mason Naturals Vitamin B-12 500 MCG tablets. Solgar Vitamin B12 is part of a group of essential nutrients. 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 homo cysteine. B12 is required for the normal development and reproduction of red blood cells, which help to deliver oxygen throughout the body. In addition, B12 helps with DNA synthesis and renewal.