i am sure there are a lot of ppl who will vouch for the quality/purity of NP bulk powders, $21 for 500 grams of BA is the least expensive i have come across, at dosages of 6 grams for the first month followed by 3 grams a 500gram pack runs for about 4 months.......a lot of new formulations have BA in them so u cant compare them with BA alone