Today I was out in the garden and something landed behind my ear. Naturally I swatted it and my own bee stung me. I had to mourn the loss, however went up to the house to try this remedy and it does work !! No stinging feeling, just swelling and redness. There must be a natural anti-septic or neutralizer in the onion slice. Took about a minute to react, but works good so far. Can't believe it.