Vitamin B12: What It Is, Forms, Cautions, and Clean Brands

Vitamin B12 is cobalamin, an essential B vitamin. It supports energy and nervous system health.*

Forms and what to look for on the label

Methylcobalamin and cyanocobalamin both work. Sublingual (under-the-tongue) forms are common.

Before you take it

It’s often needed by people who eat plant-based, older adults, and people on metformin or acid-reducing medication.