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faseb.onlinelibrary.wiley.com
On the other note, THC is actually an anti-androgen.
But from OP's study:
"Tetrahydrocannabinol (THC) is a CB1 receptor partial agonist, and it has been shown to dose-dependently inhibit hair shaft elongation, decrease proliferation of hair matrix keratinocytes and induce intraepithelial apoptosis and premature hair follicle regression (catagen)"
These effects were inhibited by CB1 antagonism. As we all know, CBD, when smoked in conjunction with THC, reduces the negative effects of THC. This seems to be the case as well when applied topically. CBD is a CB1 antagonist and prevents THC-induced CB1 agonism. But, as the study says, at higher concentrations, CBD can possibly induce hair-loss via another mechanism being TRPV4 activation-
"A more recent study of human hair follicle cultured cells (Szabóet al., 2017) revealed that use of lower doses of CBD resulted in hair shaft elongation, likely via CB1 antagonism. However, much higher doses resulted in premature entry into the catagen phase, probably via a different receptor, the vanilloid receptor-4 (TRPV4). Therefore, the dosing of the topical CBD needs to be evaluated in order to obtain positive hair regrowth."
Why does she have to be either? Obviously, there isn't enough science on this topic, even the authors of the study mention the lack thereof. Should we not stay with an open mindset, yet maintain skepticism? Not form an absolute opinion prematurely.
If this actually works, and with the increasingly availability of CBD around the world, it could be a possible cheap adjunct, no? It works through other pathways than minoxidil and finasteride. As previously stated, the authors note how there are dose-dependent effects and that higher could work to the contrary