Stinging nettle has a long, wide-ranging history across Europe and Asia, notable for a peculiar irony: the same fine hairs on its leaves that cause a painful, stinging rash on contact were also, once processed, turned into one of the most useful plants in traditional life — nettle fiber was spun into cloth and rope for thousands of years, nettle leaves were eaten as a spring vegetable once cooked (which neutralizes the sting), and its root and leaf were used medicinally across multiple independent traditions.
Ancient Greek physician Dioscorides documented nettle's medicinal uses in the first century CE, and it remained a staple of European folk medicine for joint pain and urinary complaints for centuries afterward. Its modern research reputation rests primarily on a fairly specific, well-defined use — supporting prostate health in aging men — a much narrower and more testable claim than the broad "cure-all" reputation nettle sometimes carries in folk tradition.
Nettle's clearest modern evidence relates to benign prostatic hyperplasia (BPH), the non-cancerous prostate enlargement common in older men. A randomized, double-blind trial of 100 BPH patients found nettle root extract produced significant improvement in symptom scores over 8 weeks compared to placebo, and an earlier, larger trial of 917 BPH patients found similar significant reductions in symptom scores, PSA, and prostate size.
For allergic rhinitis, a randomized, double-blind, placebo-controlled trial of nettle root extract found significant improvement in symptom severity and measurable reductions in inflammatory markers on nasal smear testing. The honest caveat, echoed by multiple reviewers including Drugs.com's natural products database: while individual trials for both BPH and allergic rhinitis are genuinely positive, the overall number of rigorous trials remains fairly limited, and commercial nettle preparations are not well standardized, meaning results between different products may vary more than the trials suggest.
Young leaves cooked (neutralizing the sting) and eaten as a vegetable or soup, dried leaves steeped as tea, or root prepared as extract or decoction.