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Vitamin B12 Vitamin B12 supports energy production, red blood cell formation, and nervous system function

That said, none of these studies look into the thing most people use BPC for: subcutaneous injury recovery

Additionally, a meta-analysis of multiple randomized, controlled trials confirmed that tesamorelin treatment significantly lowered visceral fat area and trunk fat, reduced hepatic fat, and was associated with a statistically significant increase in lean body mass, supporting its clinical effect on fat distribution and muscle preservation

R.PlattnerR.et al (2021)

In sporadic PD patients, the degree and prevalence of Complex I deficiency are heterogeneous