Will your supplements and meds interact?
Curated clinical interaction rules check any combination of supplements and medications for dangerous interactions — free, no account needed.
Free · No account needed · No ads, no affiliate links, nothing to sell you
Rules decide the warnings
A hand-written clinical rule set runs on every check — serotonergic pairs, blood thinners, potassium, thyroid minerals and more
AI only writes the explanation
It puts the analysis in plain English. The rules run after it and only ever add warnings or lower the score — never the reverse
Real label data
Milligram totals come from the NIH Dietary Supplement Label Database — the amounts printed on your actual bottles
The checker's dictionary covers 378 supplements and 140+ medication and brand names, and label milligram totals come from the NIH Dietary Supplement Label Database. How the analysis works.
How It Works
Three steps, no account, nothing to install
Type in your supplements or the ones you're considering
Curated interaction rules check the combination; the AI writes up what they found
A safety score, every flagged interaction, and a one-page doctor-visit report — free for everyone
Everything for your supplement routine
Safety analysis for any combination of supplements and medications — curated interaction rules, explained in plain English.
Goal-based stack suggestions from well-studied ingredients — interaction-checked before you see them.
Upload your 23andMe or AncestryDNA file for supplement insights matched to your genes.
A 7-day meal plan sequenced so your supplements absorb — shaped by your stack, goals, DNA, and what you have in your kitchen.
Your whole stack on one daily schedule — supplement timing for absorption, with reminders.
One standing view of your whole cabinet against your conditions, kept up to date instead of re-run by hand.
Tell us what's in your pantry — meal plans build around what you already have.
Every supplement and med you own, in one place — scans add themselves, and tools use it so you never re-type.
Keep your stacks and re-check them anytime — re-scored monthly with email alerts.
Save conditions, medications, and allergies once — every tool personalizes automatically.
Free tools — no subscription needed
Free, and staying free: unlimited interaction checks with no cap on how many medications you add, bottle scanning, Build My Stack, My Cabinet, your health profile, dose reminders with calendar export, the printable doctor-visit report, the shared-protocol checker, and 1,200+ supplement reference pages. Every interaction warning and every condition-specific warning is free for everyone — we don't sell safety, and there are no ads, no supplement sales and no affiliate links anywhere on the site.
Cabinet Watch
Checking is free. Watching is paid.
The checker stays free. Cabinet Watch is the version that remembers your cabinet, your meds and your conditions, and keeps re-checking them as the rules and your routine change
Unlimited Stacks
Save unlimited supplement combinations — all re-scored monthly with email alerts
Timing Schedules
Your whole stack on one daily schedule, with pairs that compete for absorption in separate slots
Advanced Safety
One standing view of your whole saved cabinet against your conditions — the warnings themselves are free on every check
Food & Absorption
Meals sequenced so your supplements absorb — shaped by your stack, goals, DNA, and your kitchen
DNA Analysis
Supplement recommendations matched to your genes — MTHFR, COMT, CYP1A2
Your Cabinet, Re-Checked
Every saved stack re-checked about monthly as the rules change — with an email when a score moves
DNA-Based Supplement Notes
Upload your 23andMe or AncestryDNA file and we read 9 variants across 7 genes, then explain what each one does and does not mean for the supplements you take
Upload Your DNA File
Supports 23andMe, AncestryDNA, and other major DNA testing platforms. Your raw file is processed in memory and never stored.
Genetic Analysis
We read 9 variants across 7 genes — MTHFR, COMT, CYP1A2, VDR, APOE, FUT2 and BCMO1 — and show the rsID and the genotype found in your file for each one
Notes You Can Check
Plain-English notes on what each variant does and doesn't mean, with the reasoning shown. The $29 one-time report (also included with Cabinet Watch — Yearly) is yours to keep; on a monthly subscription access locks when the subscription ends. You can delete your stored results at any time.
DNA analysis is included with Cabinet Watch ($9.99/mo or $59/yr). The keep-forever report is $29 one-time (free with Cabinet Watch — Yearly), with a 14-day money-back guarantee.
Check What You Already Take
No account, no ads, no affiliate links, and nothing for sale — the interaction checker is free and stays free
Check My Supplements — FreeCanIStackThis provides informational insights only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a healthcare professional before making supplement decisions.