Quote Originally Posted by quarry206 View Post
actually B-12 is a great supplement and you can't get really anything from pill form 1%-8%.. it really helps with not burning out your CNS, and it helps with growing muscle.

if you are training hard, B-12 is a great supplement.. its not ungodly, but injectable B-12 is a very good thing to try


 There is no scientific evidence supporting the notion that injections are more effective than sublingual supplementation of B12. You only need about 2 micrograms or 2 millionth of a gram/day. The Cyanocobalamin supplementation of B12 needs to be converted to Methylcobalamin before the body can utilize it. Total body store is 2-5mg in adults. Around 80% of this is stored in the liver.. Absorption of B12 is hard for your body. It usually only utilizes 1-2% of what you ingest passively.

If you think you're deficient, which you shouldn't be, seeing as BBers and athletes consume large amounts of protein -- B12's most provided source (eggs especially) -- then consume about 1000mcg a day for about a month. Deficiency is usually prominent in vegetarians, where malabsorption is usually represented by lack of intrinsic factor.

Festen, H.P., Intrinsic factor secretion and cobalamin absorption. Physiology and pathophysiology in the gastrointestinal tract. Scand J Gastroenterol Suppl, 1991. 188: p. 1-7.