The most important idea in this app
A hazard is something that can cause harm. Risk is the chance it actually does — which depends on dose, route and duration of exposure.
A shark is a hazard. Your risk depends on whether you're in the water with it.
Water, salt and vitamins all become harmful at high enough doses. The dose makes the context.
Swallowing, breathing in and skin contact can carry very different risks for the same substance.
Detecting a substance — even absorbed into blood — doesn't by itself show harm.
General education only, not medical advice. Drafted Oct 2026 · pending qualified expert review.