Drugs.com Interaction Checker
drugs.com
Lists the interactions between the medicines, supplements and alcohol you enter
No sign-up
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fdc.nal.usda.gov
The USDA's laboratory-measured nutrient data for tens of thousands of foods.
The database every calorie tracker ultimately copies from: energy, macronutrients, vitamins and minerals per 100 g, separated into laboratory-analysed foundation foods, the legacy standard reference, and label data submitted by brands. Going to the source matters when an app's number looks wrong, because you can see which of those three it came from. Free, no account, with a public API.
Questions
Works the moment the page loads. No account, no email, no trial. It is US foods with US portion conventions, and the branded entries are manufacturer-supplied rather than independently tested.
Yes. FoodData Central sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.
It is US foods with US portion conventions, and the branded entries are manufacturer-supplied rather than independently tested.
Alternatives
Same category or same task, ordered by how closely they overlap.
drugs.com
Lists the interactions between the medicines, supplements and alcohol you enter
medlineplus.gov
Plain-language health information from the US National Library of Medicine
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An exercise library that names the muscles each movement actually works
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omnicalculator.com
Around 3,000 small calculators, each with the formula shown underneath