There is more than one form of Vitamin B12. What's the difference between each of them?

Cyanocobalamin - synthetic B12 that is poorly utilized by the body. Throw it away!

Methylcobalamin - A biochemically active form of B12 important for methylation. Many people are deficient--vegans/vegetarians, those who take antacids, or don't eat much meat.

Adenosylcobalamin - The mitochondrial form of B12 that supports energy production. These patients may have high methylmalonic acid (MMA) levels.

Hydroxocobalamin - Can be used to reduce nitric oxide levels if they are too high.