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Finasteride may decrease free testosterone by increasing SHBG, potentially causing side effects like reduced libido and hormonal changes. Some find it effective for hair loss, while others experience negative effects.

Quercetin reduced scalp soreness and may help with histamine-related hair loss. The soreness felt like inflamed follicles beneath the scalp surface.

Quercetin and houttuynia cordata extract may stimulate hair growth by enhancing cellular energy metabolism and increasing growth factor secretion. Quercetin has low oral bioavailability, and its natural tint might stain the scalp if used topically.

Quercetin might help with hair loss by inhibiting HSP-70, which increases androgen receptors. Concerns include its staining properties and unclear topical absorption.

A quercetin-encapsulated and polydopamine-integrated nanosystem (PDA@QLipo) shows promise for treating androgenetic alopecia by reshaping the perifollicular microenvironment, outperforming minoxidil in hair regeneration. The nanosystem promotes cell proliferation, hair follicle renewal, and recovery by scavenging reactive oxygen species and enhancing neovascularity.