What It Actually Is
B12 is an essential vitamin the body needs for red blood cell formation and nerve function, and it plays a direct role in how cells produce energy from food.
What Research Generally Shows
B12 deficiency is well-documented to cause fatigue, which is the reasoning behind including it in an energy-support formula — though supplementing beyond what your body needs generally doesn't provide extra energy if you're not deficient.
Why It's Dosed At 1000mcg
1000mcg is a high but common supplemental dose — B12 is water-soluble, so excess is generally excreted rather than stored.
