34 citations
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July 2010 in “Expert Opinion on Drug Delivery”
The document concludes that there is no agreed-upon best method for measuring drug delivery within hair follicles and more research is needed to validate current techniques.
Topical finasteride may have higher systemic absorption and lower efficacy when using a Propylene Glycol/Ethanol formulation compared to the hydroxypropyl chitosan (HPCH) formulation. The safety profile of topical finasteride relies heavily on the HPCH formulation, and using standard solutions might lead to different pharmacokinetics.
Microneedling and tretinoin may enhance minoxidil absorption for hair loss, but evidence on their effectiveness is limited. Iron supplements and broccoli sprouts are suggested for enzyme activation, but their impact on hair is unclear.
Daily microneedling at 0.25mm before applying minoxidil is debated, with some suggesting weekly microneedling is safer and more effective. Concerns include potential skin damage and systemic absorption, while alternatives like tretinoin are considered safer for enhancing minoxidil absorption.
Oral minoxidil is considered more effective for hair regrowth than topical minoxidil, but it carries higher risks. Combining microneedling with topical minoxidil can enhance absorption, but oral minoxidil with microneedling shows significant results.
Treatments for hair loss, including finasteride, dutasteride, minoxidil, ketoconazole, microneedling, and low level laser light therapy, which aim to reduce DHT production, increase cell absorption and blood flow, and stimulate epidermal stem cells. It also stresses the importance of patience when using these treatments.