Doctors identify seven supplement combinations to avoid

8 articles · Updated · TODAY · Apr 29

Harvard's Dr Pieter Cohen and Weill Cornell's Dr Zachary Mulvihill warned about pairings including calcium-iron, zinc-copper and vitamin E-vitamin K.
They said some combinations compete for absorption, reduce effectiveness or, in high doses, raise risks such as copper depletion or bleeding.
With about 75% of Americans taking at least one supplement, experts urged testing for deficiencies, spacing doses apart and prioritising food over poorly regulated products.

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