This is one of the more genuinely interesting questions in the BPC-157 story, and the published record while incomplete does offer some real clues
Protect your body from free radicals and oxidative stress with ActiNovos Glutathione
Specifically, analyzed were the affected brain areas (04), cerebral (NTP-7, Level 3), cerebellar cortex (NTP-7, Level 6), and hippocampus, thalamus, and hypothalamus (NTP-7, Level 3) as follows (score 0 indicates no histopathologic change): score 1: small, patchy, complete, or incomplete infarcts (10% of the area affected)
However, its still important to protect your skin from UV damage
Restoring levels of certain microRNAs successfully rebalanced brain cell development in the organoids
Reduced means the glutathione molecule is in its active state ready for your body to use