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Conversely I've been doing a lot more off-road riding than I would normally (and getting enough nettle stings that my shins still tingle a few days later), and my hayfever is worse than it has ever been. Suspect there's pretty good correlation between razzing around in the undergrowth, and kicking up pollen into my sinuses. But I'm now going to promote that nettles cause hayfever. KILL ALL THE NETTLES!
Very thorough response, thanks!
I used to be wiped out for months by it, now I get a few bad days a year. This began since doing more trail runs on paths that are nettle heavy around 2016 & now allotment work too amongst nettles so get regular stings.
I guess most likely maybe it is simply correlation or placebo, not direct cause but whilst something or nothing about is effective either way I'll stick with it.