Most standard supplements have very low bioavailability
Combined therapy with L-arginine and L-norvaline further enhances these effects by reducing IL-17A expression, lowering peroxynitrite-induced oxidative stress, and inhibiting iNOS activity to restore arginine metabolic balance [86]
The specific target, anti-tumor effect, and clinical progress of these inhibitors targeting NADPH metabolism are also summarized in Tables 1 and 2

Key Points As several mechanisms lead to -cell failure in type 1 diabetes mellitus (T1DM), strategies combining different molecules could target different pathways involved in the pathogenesis of T1DM Different combination therapies have been tested in preclinical studies with encouraging results, but results from clinical trials have not matched expectations Heterogeneity in the age of patients with T1DM and the low rate of human -cell regeneration are possible explanations for the negative results of clinical trials that should be addressed in future studies Proton pump inhibitors and incretin-based agents can stimulate -cell regeneration, so future trials in patients with T1DM should investigate their potential in combination with immunomodulatory compounds The issue of patient heterogeneity can be addressed by designing trials evaluating the relative effectiveness of interventions in specific subgroups of patients Abstract Immunotherapies for type 1 diabetes mellitus (T1DM) have been the focus of intense basic and clinical research over the past few decades

William Seeds on the podcast also elaborates on BPC-157, calling it a recovery and repair focused peptide
Nature 400 , 576581 (1999)