I Built a Free Supplement Stack Checker That Detects 102 Interactions

If you take more than one supplement, you might be unknowingly creating problems. Iron blocks zinc absorption. Calcium competes with magnesium. Vitamin E at high doses can thin blood dangerously when combined with fish oil. I built a free tool to catch these issues before they happen: a Supplement Stack Checker that analyzes combinations of supplements and flags interactions, absorption conflicts, and timing issues. Why I Built This I work on Botánica Andina , an evidence-based resource about medicinal plants and supplements for Latin American audiences. While building our herb-drug interaction checker , I realized there was a gap: people taking multiple supplements had no easy way to check if their "stack" was safe. The problem is real. A 2023 survey by the Council for Responsible Nutrition found that 75% of U.S. adults take dietary supplements, and the average user takes 3-4 different products. But most people never check for interactions between them. Existing tools either focus on