What’s the difference between cyanocobalamin and methylcobalamin? Which is the better form of vitamin B12?

Vitamin B12 comes in two commercially available forms: cyanocobalamin and methylcobalamin.

Cyanocobalamin, a synthetic form of B12 (attached to a cyanide molecule), is a common form of B12 used in dietary supplements because it's cost-effective.

Methylcobalamin, the vitamin B12 form we use in our vitamin products, is the active, naturally-occurring form of B12 that is attached to a methyl group and can be found in supplements as well as foods like meat, fish, milk, and eggs.

Learn more about Vitamin B12 in our Nutrient Guide.