In addition to low stomach acid you mentioned, were also going to look at the scar tissue abdominally like you mentioned, and then another one is the migrating motor complex damage due to an autoimmune cross reactivity from an infection that usually is a food poisoning type of infection
By promoting immune system function, glutathione can help to reduce inflammation and improve muscle recovery
Methionine can help support mood by supporting healthy levels of SAMe
Second, and perhaps more useful as drug evaluation tools, are ERPs
For knee osteoarthritis specifically, injectable hydrolyzed collagen (ChondroGrid) shows impressive resultssignificant improvements in pain, stiffness, and function scores after just 30 days of treatment (with statistical significance of p=0.030.04)
These modifications are attributable to extremely controlled changes in gene expression (understood by epigenetics)