1. Saw Palmetto (一种植物）。（typical dose: 320 mg per day of extract standardized to 85% to 95% fatty acids）

2. Beta-Sitosterol（临床试验中是 30 mg to 91 mg daily）

好几个网站都说第二个疗效更好：

a) consumerlab.com

b) Larry King (见 prostatereport.com) 说Saw Palmetto, lycopene 根本就是垃圾！Beta-sitosterol 是唯一有效的。他们推荐的第一名药物是ProstaGennix。 但是网页底部的一句话："Larry King is a paid endorser of ProstaGenix"，让人morbid!

c) kp.org 也是说 Saw Palmetto 没有足够证据。但是对Beta-sitosterol却有如下评论:

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What is beta-sitosterol used for?

Beta-sitosterol is said to lower cholesterol levels and reduce the risk of some cancers. It also is said to relieve symptoms of benign prostatic hyperplasia (BPH) . How beta-sitosterol works is not known. It may be related to cholesterol metabolism or anti-inflammatory effects.

A review of studies done on beta-sitosterol showed that men who took it had fewer symptoms than men who took a placebo . Symptoms were measured using the American Urological Association (AUA) symptom index . Men who took beta-sitosterol also had a better urine flow rate then men who took a placebo. footnote1

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还有，用量必须达到临床试验使用的典型剂量（所谓的“STANDARDIZED”。比如，Saw Palmetto Extract 应该是达到85% （成分重量）才能有效。所以买时要看好。因为不是所有的产品都达到这个剂量！

https://www.consumerlab.com/reviews/Prostate_Supplements-Beta-Sitosterol-Phytosterols-Saw_Palmetto/sawpalmetto/

https://www.nutraingredients-usa.com/Article/2003/05/21/Not-all-saw-palmetto-lives-up-to-its-name