bpc 157 recommended duration of use 500mcg Peptide BPC-157 BPC 157 500mcg (100 Capsules)
Description
doi: 10.1007/s00401-007-0300-z

No invasive techniques are used, and no anesthesia is required
They send signals to the brain

Znaor A, Skakkebaek NE, Rajpert-De Meyts E, Kulis T, Laversanne M, Gurney J, Sarfati D, McGlynn KA, Bray F (2022) Global patterns in testicular cancer incidence and mortality in 2020

American Family Physician

That said, we still need more detailed human studies to fully clarify these questions
