Most interaction checkers focus on drug interactions. If you want to check if your supplements interact with each other, your options are very limited. Here is an honest comparison.
WebMD and Drugs.com are excellent for drug interactions, but they have limited or no data on supplement-to-supplement interactions (e.g., calcium blocking iron absorption, or zinc depleting copper). NutriAudit is specifically built for supplement interactions — not drug interactions.
| Feature | NutriAudit | WebMD | Drugs.com |
|---|---|---|---|
| Supplement-to-supplement interactions | |||
| Drug-to-drug interactions | |||
| Drug-to-supplement interactions | |||
| 5 regional safety standards (FDA/EFSA/TGA/CNS/MHLW) | |||
| RDA and UL dosage data per ingredient | |||
| AI label scanning | |||
| Full stack safety scoring (0-100) | |||
| Duplicate ingredient detection | |||
| Completely free | |||
| No account required | |||
| Multi-product stack analysis | |||
| Bilingual (English + Chinese) |
Each tool has its strengths. Use Drugs.com or WebMD for drug interaction checks. Use NutriAudit for supplement-to-supplement safety, dosage comparisons, and full stack analysis.
Check your supplement stack for interactions, duplicates, and unsafe dosages — in 30 seconds.