fda bpc 157 warning unapproved drug BPC-157: A Prohibited Peptide and an Found in Health and Wellness Products Is BPC-157 Banned? Oral vs.
Description
Hepatotoxicity, mainly of paracetamol, is attributed to its conversion into a highly reactive metabolite called N-Acetyl-p-benzoquinone imine (NAPQI) by microsomal enzymes from the P450 family

Not much, but some can occur

Rizzo G, Lagan AS
"Hydroxocobalamin Use During Pregnancy"
During this time, an older person might have barely noticeable symptoms, or the symptoms might be attributed to another chronic health condition

This is the industry standard