A fairly recent randomized double blind study from 2013, once again confimed the benefit of nettle root for reducing symptoms in patients with BPH.
Quote from the study:
It's worth pointing out that its the root specifically that you want for treating Benign Prostatic Hyperplasia and not the leaf part of the plant.
However nettle leaf is also extremely medicinal, very nutritive and a great general tonic herb with a number of benefits such as its anti-inflammatory, anti-histamine properties, supports the adrenal glands, thyroid, liver, kidneys, connective tissue and more.
The study concluded:
Life Extension make an excellent Nettle Root and Saw Palmetto Formula w/ Beta-Sitosterol. Research has also shown that Saw Palemetto and phyto-sterols to support prostate health.
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1. The Efficacy of Stinging Nettle (Urtica Dioica) in Patients with Benign Prostatic Hyperplasia: A Randomized Double-Blind Study in 100 Patients