TLDR EGF and FGF boost hair cell growth, hydrocortisone slows it, and minoxidil doesn't affect it.
This study examined the effects of epidermal growth factor, fibroblast growth factor, minoxidil, and hydrocortisone on the growth of human hair bulb papilla cells and root sheath fibroblasts cultured in vitro. The results showed that EGF and FGF increased proliferation of both cell types, while hydrocortisone slowed proliferation, and minoxidil had no effect. The study suggests that the dermal papilla can be considered a target tissue for agents influencing maintenance of hair growth.View this study on link.springer.com →
Minoxidil helps hair regrowth, especially with more indeterminate hairs.
Minoxidil helps hair cells live longer and grow longer.
EGF and FGF boost hair cell growth, hydrocortisone slows it, and minoxidil doesn't affect it.