I Built a Free Supplement Interaction Checker — Here's What I Learned About Dangerous Combinations

If you take more than one supplement daily, you might be unknowingly creating dangerous interactions. I built a free tool to check — and the research behind it was eye-opening. The Problem: Nobody Checks Supplement Interactions Walk into any pharmacy in Latin America and you'll find shelves full of supplements: magnesium, omega-3, iron, vitamin D, turmeric. People buy them based on recommendations from friends, influencers, or quick Google searches. But here's what most people don't know: some supplements actively fight each other for absorption, while others can combine to create dangerous effects. A few examples that surprised me: Calcium + Iron: The Classic Mistake Calcium inhibits iron absorption by up to 60%. If you're taking both — which millions of people do — you might be wasting your iron supplement entirely. The fix is simple: take them at least 2 hours apart. But nobody tells you this on the label. Source: Hallberg et al., American Journal of Clinical Nutrition, 1991 Omega-3