It is important to take supplements or at least check levels regularly so that supplementation is not delayed. It is better to take just B12 instead of B complex since all the other B vitamins should be available in a healthy diet.
There are two kinds of vitamin B12 โ methylcobalamin and cyanocobalamin. Methylcobalamin is the kind which is used by our body. Our bodies cannot efficiently use cyanocobalamin. It can be supplemented through tablets as well as injections.