TLDR Saw palmetto can help with prostate issues and may promote hair growth.
Saw palmetto was found to be effective in treating benign prostatic hyperplasia (BPH) and potentially stimulating hair growth. Clinical studies, including randomized, double-blind, placebo-controlled trials, showed significant improvements in urinary symptoms and flow rates in men with BPH, with one study involving 110 men and another with 85 men. A small trial with 10 subjects indicated that 60% experienced significant hair growth. Adverse effects were generally mild, but two case reports linked saw palmetto to serious conditions like cholestatic hepatitis and intraoperative hemorrhage. Pharmacokinetic data showed peak plasma concentration 1.5 hours after oral administration, and saw palmetto did not affect several cytochrome P450 enzymes. It was approved in Germany for certain urinary problems and considered a dietary supplement by the FDA.
105 citations,
January 2004 in “The Journal of Urology” Finasteride improves chronic pelvic pain, saw palmetto doesn't.
36 citations,
January 2003 in “Molecular and Cellular Biochemistry” 
68 citations,
April 2002 in “Journal of Alternative and Complementary Medicine” Natural 5AR inhibitors effectively improve mild to moderate hair loss in men.
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There are many treatments for common hair loss, but more trials are needed to decide which are best.
212 citations,
September 2008 in “Journal of The American Academy of Dermatology” Minoxidil and finasteride treat hair loss in men, while minoxidil treats hair loss in women.
40 citations,
August 2018 in “Skin appendage disorders” Some alternative treatments for hair loss might work, but more research is needed.
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June 2001 in “International Journal of Cosmetic Surgery and Aesthetic Dermatology” Finasteride improves hair growth in men with androgenetic alopecia.
May 2023 in “Clinical, Cosmetic and Investigational Dermatology” More personalized and effective treatments for androgenetic alopecia are needed.
