ARB Topical A15F is Adegen's highest-strength prescription topical with finasteride added for DHT defense. It combines 15% minoxidil, three times the concentration of A5, and topical finasteride with our proprietary ARB complex, plus tretinoin, caffeine, and a niacinamide + biotin blend to support absorption and overall follicle health. Compounded in-house at Adegen Pharmacy and formulated to help key ingredients reach the follicle, where healthy hair growth begins, A15F pairs our most powerful topical concentration with prescription DHT defense in one formula. About the Finasteride in This Formula Finasteride inhibits the primary enzyme (Type II) responsible for converting testosterone to DHT in the scalp, helping reduce the hormone that drives pattern hair loss. Prefer our strongest DHT defense? Dutasteride, which inhibits both Type I and Type II enzymes, is available in A15D. Full Formulation ARB Proprietary Complex (designed to support the androgen receptor and follicle environment) Micronized Minoxidil 15% (150 mg/mL) Finasteride 0.3% (3 mg/mL) Caffeine 0.2% (2 mg/mL) Niacinamide + Biotin Blend 0.3% (3 mg/mL) Tretinoin 0.01% (0.1 mg/mL) Delivered via proprietary DermalDrive™ topical delivery system Best For Moderate to advanced thinning or hair loss, and anyone who wants maximum-strength regrowth support and added DHT defense in a single formula. Safety & Rx Information This is a prescription-only compounded medication containing finasteride and dispensed through Adegen Pharmacy, our licensed 503A compounding pharmacy. A licensed physician will review your information after checkout and determine if this formula is appropriate for you. Women who are pregnant or may become pregnant should not use or handle this product.