best time to take tb500 and bpc 157 tb 500 injection BPC157 peptides— this is exactly TB 500 vs BPC 157:

This compound contains a small percentage of benzyl alcohol, which acts as a bacteriostatic agent, preventing the growth of bacteria and ensuring the integrity and safety of the solution over time

BPC-157 is manufactured in a cGMP compliant, ISO9001 certified laboratory to a guaranteed purity of 98% or above

Am J Respir Crit Care Med 178(7):682687 Peters-Golden M, Swern A, Bird SS, Hustad CM, Grant E, Edelman JM (2006) Influence of body mass index on the response to asthma controller agents

But it has not been ruled out, and the FDA's briefing documents noted it as an uncharacterized risk requiring further investigation before any approval

You can get research-grade peptides without a prescription, but unless you mean to conduct your own in vitro experiments, you should leave them alone