Some patients feel improvements immediately, while others may see benefits within a few days to a week, depending on the injection type and individual factors
(20) Intestinal problems: Because B12 is absorbed in the intestines, any disease that impairs intestinal function can interfere with B12 absorption
Because of this, using a pill form of the supplement creates an additional step for transferring the B12 into the bloodstream and can cause your body to absorb less of the vitamin
The provider matters more than the molecule: sterility, verified concentration, correct dosing, and supervision are what separate a clinical result from a gamble
However, if lower bioavailability means weaker results, the cost per result (weight lost per dollar spent) may actually favor injectable delivery