It has been speculated that the effects on DDAH activity are largely mediated by the antioxidant effects of these thiols [45][47]

Boosting BDNF: Curcumin reverses the decrease in BDNF levels from chronic stress.[ref] Rheumatoid Arthritis: Curcumin is beneficial in reducing inflammation in RA.[ref] IL-17 and Autoimmune Risk: Curcumin was found to decrease IL-17 (in an animal study).[ref] HMGB1 and Inflammasome activation: In animal studies, Curcumin inhibits HMGB1 release .[ref][ref] Osteoarthritis: A natural TNF-alpha blocker, curcumin has been shown in several studies to be effective for osteoarthritis.[ref][ref] A clinical trial found that curcumin (500mg / 3x per day) was as effective as diclofenac for osteoarthritis but with fewer side effects.[ref] MRGPRX2 receptor on Mast Cells: Curcumin is likely a MRGPRX2 receptor blocker (animal and cell studies).[ref] Full article and details on berberine Berberine is a natural supplement with some amazing research for reducing high blood glucose levels and high cholesterol
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There are many trials, but a lot of them are small, run for a matter of weeks or a few months, and vary in quality
3 Mechanisms of key bioactive compounds in modulating signaling pathways involved in gastrointestinal disorders
doi: 10.1177/039463201102400108