most reputable bpc 157 BPC-157 and the Difference Between an Evidence Gap and a Cover-Up: What the entire human evidence base actually looks like, and the questions to ask next. — WellFounded Where to Buy BPC-157: A
Description
Cyano-B12 is the most commonly used, and cheapest, form of B12 with no substantial evidence that other forms are more effective in improving B12 status

doi: 10.1007/978-1-62703-065-6_15

No rash or swelling, though, and no other side effects at all
This creates a clear record that protects you in the event of any unexpected question, while remaining entirely routine and non-disqualifying

WADA does not state why it has banned BPC-157, but presumably there are concerns about the lack of research into its safety and the (also unresearched) possibility that it does indeed enhance athletic performance

Accurate dosing depends on the right mix
