Non-GMO & Gluten Free Centrum and Centrum Silver tablets are made without ingredients that are genetically engineered for a verified non-GMO and gluten-free formula. #1 Doctor Recommended Multivitamin Brand With our highest levels of Vitamin D3, a preferred form of Vitamin D, Centrum is the most complete multivitamin for men and women, making it the #1 doctor and pharmacist recommended multitvitamin brand.