Saw Palmetto for Hair Health

Research suggests that saw palmetto may support hair health primarily through its ability to inhibit 5-alpha reductase, the enzyme that converts testosterone into DHT, a hormone linked to hair follicle miniaturization in pattern hair loss. The available evidence includes a small 2002 randomized controlled trial showing improvement in 60% of treated men, multiple supportive reviews highlighting saw palmetto among promising botanical options for androgenetic alopecia and female hair loss, and preliminary laboratory research suggesting the ingredient may also promote hair growth through mechanisms independent of hormone pathways. However, the broader evidence base is notably limited — most supporting studies are reviews or secondary analyses rather than large independent clinical trials, sample sizes are generally small, and a 2025 systematic review and network meta-analysis evaluating dietary supplements for pattern hair loss did not identify saw palmetto among the top performers, reflecting mixed findings across the literature. Additionally, at least one safety-focused analysis flagged saw palmetto as a supplement warranting caution, and a case report raised questions about potential persistent side effects in some individuals, underscoring that while the ingredient shows theoretical and early-stage promise, consumers and clinicians are advised to weigh the limited and inconsistent evidence carefully.