how are vitamin b12 injections administered Treating Severe Deficiency Vitamin B12 Injection Dose: 7

Most people feel improvement within a few days, although redness or swelling can sit longer when the muscle absorbs more fluid at the injection site

Custom packaging requirements are also accepted

I found the reference to stiffness and muscle pain in undertreated B12 deficiency....it's in the pinned posts to the right on the home screen (sorry, foggy so can't remember precisely which one - but it's there if you want to have a search)

NAD + homeostasis The NAD + molecule is composed of a pyridine, derived from NAD + precursors such as tryptophan (Trp) or nicotinamide (NAM) 20 , a purine, and a 5-phospho-d-ribosyl-1,-disphosphate (PRPP) component 21