Supplement interaction checker
Add the supplements you take and see spacing notes, overlapping ingredients, and caution categories worth reviewing — with the fix (how far to space them), not just a red/green verdict. It's free, needs no account, and stays on your device. Informational only, not medical advice.
Check a combination
Pick two or more supplements to see commonly noted spacing and caution prompts. Informational only — not a safety verdict.
What it checks — and what it doesn't
✅ It flags
- Minerals that compete for absorption (space them apart)
- Fiber that can blunt absorption of other items
- Overlapping ingredients across products
- Caution categories to raise (bleeding, blood sugar, surgery, etc.)
🚫 It won't
- Give a personal “safe / unsafe” verdict for your medications
- Rank brands or name a “best” supplement
- Say a supplement treats, prevents, or cures anything
- Replace a pharmacist or clinician who knows your full history
Turn a clean list into a routine
Once you know what to space, the Stack Builder turns your goal into a day-parted routine, and the planner exports a clean list to bring to a pharmacist. See also the compatibility chart and spacing supplements from medications.
Common questions
Is this supplement interaction checker free?
Yes — it's completely free, needs no account, and nothing is sent to a server. You add the supplements you take and it shows spacing notes, overlaps, and caution categories to review. It's informational only, not medical advice.
Does it check interactions with my prescription medications?
Not as a personal verdict — that's your pharmacist's job. What it does is flag the medication caution categories an item is commonly discussed under (for example, blood thinners or glucose-lowering drugs) so you know exactly what to ask about. For timing rules between specific medicines and supplements, see the medication-timing guide.
What makes this checker different?
Most checkers give a red/green result. This one is cautious and shows the fix: when two things are better spaced apart, it says by roughly how long, and it frames caution categories as prompts for a professional rather than verdicts. It never ranks brands or claims a supplement treats anything.