Its important to note that for individuals who already have normal B12 levels, scientific evidence does not support the idea that B12 injections will further increase energy or provide a significant energy boost. Your body will simply eliminate any excess B12 it doesnt need
Furthermore, it found low plasma PLP levels among supplement users and non-users alike, more so in women than in men, non-Hispanic blacks than whites, current smokers than never smokers, and those classified as underweight relative to normal weight.2 Teenagers had the lowest concentrations followed by 2144 year olds with elderly people having levels that were not particularly low even without supplement intake
MARCHETTI, M., TESTONI, S
Studies show about 25 percent of seniors have B12 deficiency they lose the ability to absorb B12 as they can for other nutrients
Or when you feel the effects of the B12 wearing off