It will burn if citric acid gets in your eyes. If this happens, flush them well with water for several minutes. If you wear contact lenses, take them out as soon as you can.

Citric acid is safe to use on sensitive skin, but "given the lower threshold that sensitive skin has for exfoliation, always start slow and low, with a low concentration, and no more than once a ...

The citric acid in lemon juice can kill bacteria and other germs. Exactly where lemons came from isn't known. But there's documented evidence of its value from almost 2,000 years ago.

Use citric acid as you would more familiar seasonings—sparingly but often. With citric acid, a little goes a long way, so add it slowly and taste as you go.