The bursa allows muscles and tendons to easily glide over boney prominences
For unapproved peptides, the honest caveat matters: where human half-life has never been measured, any protocol you see online is a guess, usually copied from rodent studies
GHK-Cus 4,000+ gene modulation profile includes genes relevant to hair (collagen III, decorin, TGF-beta regulation) alongside broader wound healing and anti-aging gene programs providing a more comprehensive regenerative signal that supports the scalp environment as a whole rather than targeting follicles specifically
"Together, these peptides support the hair growth cycle, improve follicle health, and enhance the look of fullness and thicknessparticularly in early thinning or diffuse shedding." Copper peptides: The most well-known peptides, Queller says "they help strengthen follicles, encourage blood flow and support thicker, healthier hair growth." Signal peptides: Common examples of signal peptides are palmitoyl tetrapeptide-20 and acetyl tetrapeptide-3