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As a male runner who is a little reluctant to wear a bra, I used to suffer from runners nipple for any distances over 5 miles.
Like many of I have tried plasters and vaseline, but none last the distance.
Try painting a little Germolene New Skin Liquid Plaster on your nipple before your run. I have ben doing this for over a year, and my problem is solved.
This works a treat.