Katy Perry even once tweeted about getting a B12 shot in her butt. So what's the deal with B12, and is it deserving of the celebrity hype? Here's what to know about the purpose of the vitamin, how to tell whether you might be deficient in it, and what http://r-n-foto-raf-ekimi-i-ilan94948.blogdigy.com/bir-nceleme-b12-vitamini-fiyat-16852932