Now Foods B-12 250 LOZ 1000 mcg

海外からですがとてもリーズナブルな値段で求めやすくていいです。

To wrap/preserve the B12, Cyanocobalamin (costs less, longer shelf time) uses a Cyanide precursor which is not body soluble (accumulates in the body), Methylcobalamin is an alcohol body soluble (disposed by the body). One debate is whether the precursor to Cyanide is consumed in such small quantities (at a particular time) that this would not be an issue. Unfortunately, the effect over a lifetime is not being considered. Look up the information and make a decision for yourself. See which organisations support which side of the issue. Search Methylcobalamin vs Cyanocobalamin.