Investigational Regenerative Approaches

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We wanted to share an important update on investigational regenerative approaches and alternatives in hair restoration.

Investigational Regenerative Approaches

Exosome-based therapies remain investigational. A 2024 review identified nine clinical studies involving 125 patients, but the overall human evidence base is small and heterogeneous. Importantly, there are currently no FDA-approved exosome products; any discussion should reflect the investigational status, product variability, and need for appropriately controlled clinical research.
Clinical review of exosome studies · FDA safety notification on exosome products

PP405 is an investigational topical small molecule designed to reactivate dormant hair-follicle stem cells through metabolic signaling rather than androgen suppression. In company-reported Phase 2a findings, 31% of men with more advanced loss achieved a greater than 20% increase in hair density at eight weeks versus 0% with placebo. These early findings are promising but should be interpreted as preliminary pending peer-reviewed publication and confirmatory Phase 3 results.
Phase 2a report on PP405[dermatologytimes]

Saw Palmetto as an Alternative

For patients who decline or cannot tolerate finasteride, Serenoa repens (saw palmetto) may be a discussion point, with the important caveat that its evidence base is substantially less robust than that for FDA-approved therapies. A systematic review identified five RCTs and two prospective cohort studies of saw-palmetto-containing products, with generally favorable but heterogeneous results; standardized preparations and realistic counseling are essential.
Systematic review: saw palmetto in hair loss

Take the Next Step With HPI Hair Partners

If you have questions about emerging hair therapies or want to review your current treatment plan based on the latest clinical evidence, we’re here to help.

Book Your Consultation today to receive a personalized evaluation and discover the best approach to protecting and restoring your hair.

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