BPC-157 is studied for processes involved in tendon and connective-tissue repair, including collagen organization and cellular responses to injury. The potential application is tissue recovery, supported here by preclinical findings rather than established clinical benefits.
GHK-Cu is investigated for collagen, extracellular-matrix remodeling and skin biology. These processes explain interest in skin and tissue applications, but results differ by experimental setting and cannot be transferred between topical and injectable formulations.
NAD+ is a cofactor involved in cellular energy reactions and enzyme activity. Research examines its metabolism and related pathways; measuring NAD+ metabolites does not by itself demonstrate more energy or slower aging.
Retatrutide combines GIP, GLP-1 and glucagon receptor activity. The cited phase II trial reported weight reductions that motivate further clinical study; its findings concern a particular investigational treatment and follow-up period.
Tesamorelin stimulates the GHRH pathway. Human studies in HIV-associated abdominal fat accumulation have measured reduced visceral fat; that specific finding should not be confused with general body-weight loss.
Tirzepatide combines GIP and GLP-1 receptor activity. Human trials have measured substantial weight reduction with specific medicines and treatment plans; individual outcomes and risks vary, and these results do not establish equivalence of other preparations.