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In this exploratory randomized controlled trial, participants using a combination of Centella asiatica-derived extracellular vesicles with recombinant growth factors showed significant improvements in hair thickness, density, length, and reduced hair loss and scalp sebum content after 56 days, compared to placebo.

This study found that applying a topical scalp essence with Centella asiatica extracellular vesicles and growth factors significantly improved scalp health and hair growth compared to a placebo after 56 days.

In this study, a 90-day course of a plant-based supplement significantly improved hair density, skin hydration, and nail growth among participants with dermatological concerns, while also reducing hair fall and pigmentation, without adverse effects.

This study found that in male badgers, seasonal molting and hair growth are influenced by cycles of plasma testosterone and thyroxine, with hormones affecting the timing and progression of these processes.

This study found that selecting Angus cattle for early puberty reduced their prolactin levels, which may indicate a response to changing day length.