Hi, orthopedic sports medicine surgeon here. Patients ask this question to me often.
Typically, I will ask them to define “peptides“. Most often, they are referring to BPC 157. There’s one pubmed indexed study on human subjects. N = 2 showing no adverse effects with IV administration. Not even efficacy - just no adverse effects in two subjects. That’s literally almost the lower limit of how underpowered a study can be.
I tell them that where we are with the science of BPC 157/“peptides” is that we don’t know. We don’t know if it will be of any benefit, and we don’t know whether or not it will make them worse.
If they still want to shell out thousands of dollars to a wellness clinic after that, they’re welcome to do so under someone else’s medical license and liability.
Edit: link to study