
Experts warn against common supplement pairings that can block absorption
A TODAY health explainer warns that popular supplements can interfere with each other at high doses, reducing absorption or causing unintended effects. Notable combinations to avoid include calcium with iron, calcium with magnesium, calcium with zinc, zinc with copper, zinc with iron, and vitamin C with vitamin B12 or high-dose vitamin E with vitamin K. Experts advise taking interacting nutrients several hours apart, consulting a doctor, verifying supplement quality, using third-party certifications, and prioritizing a food-first approach rather than megadosing to replace a healthy diet.




