Background: A contributing factor to male pattern hair loss (MPHL) is a compromised microcirculation and increased vasoconstriction in the scalp. Since endothelial nitric oxide (NO) was found to act as a vasodilator, our study looked at the efficacy of an amaranthus hair cream in delivering absorbable nitrates to the scalp that would convert to NO resulting in vasodilation and also deliver the nutrients to the scalp. Methods: This was a randomized, double-blinded, placebo-controlled parallel arm study of 50 males of 25-45 years. The study included clinically diagnosed MPHL having Norwood classification III vertex, IV, V, and hair density >100 as measured with Trichoscan. Individuals having a history of active hair loss due to alopecia areata, scarring alopecia, diffuse telogen effluvium or dermatological conditions other than androgenic alopecia were excluded from the study. Amaranthus or placebo cream ∼2 g was applied to the targeted area once daily at night for 90 days. The primary outcome was the mean change in terminal hair density and hair-shaft diameter of terminal hair. The secondary outcome was a mean change in the density of vellus, anagen, and telogen hairs, pilary index, terminal to vellus ratio, and anagen to telogen ratio. Results: The terminal hair density increased significantly (p < 0.0001) by 28% from baseline while placebo had 15% change. Anagen hair count and density increased significantly (p < 0.0001) by 54% from baseline while placebo had a 17.5% change. The pilary index was significantly increased (p < 0.0001) by 25% from baseline while placebo had 7.3% change. The anagen by telogen ratio showed significant increase (p < 0.0001) of 1.5 times whereas placebo showed only 21% change. Conclusion: Amaranthus extract cream significantly improved anagen hair density and follicular health. No adverse effects recorded from this suggest that the Amaranthus extract cream is potential as a safe, and effective supportive therapy for MPHL.
Keywords: alopecia; amaranthus; hair; nitric oxide; nutrients; scalp; vasodilation.