Women are being warned against a dangerous health trend involving applying an ointment made from ground-up wasp nests on their vagina, with proprietors saying the salve adds to the tightening and healing of the vaginal walls, the U.K.’s The Sun reported.

“Here’s a pro-tip, if something burns when you apply it to the vagina, it is generally bad for the vagina,” The Sun cited gynecologist Dr. Jen Gunter as writing on her blog.

Online retailers are peddling a paste made from crushed oak galls, nests that house wasp eggs before they hatch, and advising that application to the inside of the vagina improves a woman’s sex life, heals post-delivery incisions, “rejuvenates the uterine wall” and cleans out the vagina. Women are warned against a burning sensation with application.

On sites like Etsy and eBay, the herbal remedy typically comes from India or Indonesia and is also advertised as being useful in bleeding disorders and excessive bleeding during menstruation.

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