"Antivaxxer*" here. I'm not injecting peptides for a similar reason - I'm not convinced the cost/benefit works out. That said, the issue for many is autonomy - if you want to put novel stuff in your body, go ahead. As long as you don't try to compel me to do it.

* Not if we're actually in literate company, but that seemed to be the common consensus after I skipped the jab, having recovered from covid right before the shots became available. Nevermind that my doctor was on board and I've had all the other ones (minus the flu shot). I was still a selfish grandma killing Republican who probably voted for trump to the commentariat.