Keto SlimX Linda Van Horn, PhD, RD, chief of vitamin; professor, division of preventive medication, Northwestern University Feinberg School of Medicine. A certain mix of antioxidants, zinc, and omega-three fatty acids might decelerate ARED. Vitamin D. Too a lot of this could result in a buildup of calcium . If you’re pregnant, vitamin A in retinol type could make it extra doubtless that your baby could have birth defects. “At excessive doses, are medicine,” says Donald Boyd, MD, a registered dietitian and assistant professor of medicine at Yale School of Medicine.