how long do b12 injections take to kick in This Is It Takes For A Vitamin Injection Start Working Feeling worse after B12 Injection:

Sequence analysis of somatomedin-C: confirmation of identity with insulin-like growth factor I

L-Carnitine also supports faster recovery after exercise and may promote lean muscle development

Having injections too often without a real need isnt necessarily helpful, since your body can only use so much B12 at once, and the extra is simply passed out in your urine

Keeping it off is another entirely

B12 supplements are typically present in the cyanocobalamin form, which must be converted in the body to active-B12, methylcobalamin and 5-deoxyadenosylcobalamin

Int J Pharm Pharm Sci 3 Singh M, Chitranshi N, Singh AP et al (2012) An overview on fast disintegrating sublingual tablets