Free · Private · Evidence-rated
Supplement interaction checker & daily timing planner
See which of your supplements conflict, which work better together, and when to take each one — with medication warnings and the evidence behind every rule.
Your stack (0)
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One-click presets
Medications & conditions
Optional. Stays in your browser — nothing is sent anywhere.
Build your stack to see results
Add two or more supplements. You'll get conflicts, synergies, medication warnings and a daily timing plan — instantly, in your browser.
Popular questions
Frequently asked questions
How does the supplement interaction checker work?
Every pair in your stack is matched against a curated set of rules built from NIH fact sheets and peer-reviewed studies. Each rule lists its mechanism, a practical recommendation and an evidence level. Everything runs in your browser — nothing you enter is sent to a server.
How is the daily schedule created?
Each supplement has preferred times (for example iron on an empty stomach, fat-soluble vitamins with a meal). The planner then searches for the arrangement that honors those preferences while keeping competing nutrients apart and synergistic ones together — and keeps minerals away from thyroid medication if you flag it.
Does 'no interaction found' mean a combination is safe?
No. It means there is no documented interaction in our dataset. Always check with a pharmacist or doctor, especially if you take prescription medication.
Is it free?
Yes. There is no sign-up and your stack is saved only in your own browser.