A 2021 review in Nature Reviews Molecular Cell Biology describes a gradual drop in tissue and cellular NAD+ across aging in rodents and humans, and links that fall to metabolic disease, cognitive decline, and sarcopenia [1]
It is a systemic input that improves the underlying biology supporting hair growth: protein synthesis, tissue repair, sleep quality (which influences hair growth cycles), and the anabolic state that supports anagen phase maintenance
Decrease dose consideration: Persistent side effects including headaches, fatigue, or injection site reactions, excessive response (extremely rapid weight loss suggesting dose may be higher than needed), cost concerns when lower doses might achieve similar results
BPC-157 has been shown in research settings to influence angiogenic signaling, nitric oxide pathways, and fibroblast activity, while TB-500 has been studied for its role in actin regulation, cell migration, and wound-healing mechanisms