Based on the search results, rapamycin appears to have promising effects for promoting hair growth and reversing hair graying:
Rapamycin has been shown to prolong the anagen (growth) phase of the hair cycle, allowing hair follicles to remain in the active growth state for longer[1][4]. This can help reduce hair shedding and promote hair regrowth.
Rapamycin also enhances melanin production in hair follicles[4][5], which can help reverse hair graying by restoring pigmentation to the hair. Treating gray hair follicles with rapamycin was found to restore their hair coloration capacity[5].
The mechanism behind these effects is that rapamycin inhibits the mTOR signaling pathway, which regulates various cellular processes including hair follicle stem cell function, autophagy, and inflammation[2][3]. By modulating mTOR, rapamycin can improve the health and regenerative capacity of hair follicles.
Overall, the search results indicate that rapamycin holds promise as a treatment for hair loss and graying, though more research is still needed to fully evaluate its efficacy, safety, and optimal application methods in humans[1][3].
Sources
[1] Rapamycin and its Promising Role in Hair Growth Enhancement
Rapamycin and its Promising Role in Hair Growth Enhancement - Valhalla Vitality
[2] mTOR signaling in hair follicle and hair diseases: recent progress
mTOR signaling in hair follicle and hair diseases: recent progress
[3] Buy Topical Rapamycin Cream for Hair Growth - Healthspan
Buy Topical Rapamycin Cream for Hair Growth: Doctor's Prescription | Healthspan
[4] mTORC1 activity negatively regulates human hair follicle growth ... - NCBI
mTORC1 activity negatively regulates human hair follicle growth and pigmentation
[5] New Study Suggests Rapamycin Can Reverse Hair Graying and Promote ...
New Study Suggests Rapamycin Can Reverse Hair Graying and Promote Hair Growth