Do dock leaves cure nettle stings?

Professor John Tregoning, a professor at Imperial College London and author of Live Forever? A Curious Scientist’s Guide to Wellness, Ageing and Death, said that using dock leaves to treat a nettle sting offers no specific benefit.

When a nettle brushes the skin, tiny hairs inject chemicals such as histamine, acetylcholine and serotonin, causing burning, itching and redness. Tregoning explained that dock leaf sap is unlikely to contain compounds that significantly counter these effects, stating “Maybe, but probably not.” He added that rubbing a leaf may simply create a competing sensation that distracts the nerves, noting “There’s a limit to the number of sensations that the nerve cells can process, so if you overstimulate them with the rubbing there’s less feedback from the pain.” He also suggested the brief distraction of searching for the leaves could help, saying “The short burst of pain is relieved in the time spent hunting for the dock leaves.” A small study involving nine medical students compared dock leaves with lettuce leaves and found no meaningful difference, leading Tregoning to suspect any perceived relief is likely a placebo effect.