In most cases, iron and magnesium are safe to supplement together. However, be careful with the form of magnesium you choose. There is some evidence showing an interaction between iron and antacids, including magnesium oxide 8. They found that magnesium oxide can impair iron absorption by decreasing the pH and forming macromolecular polymers. “Take water-soluble vitamins on an empty stomach with a glass of water,” recommends Dr. Perez-Gallardo. And since it can be energizing, Dr. Perez-Gallardo says that the best time to take vitamin B12 is in the morning, so it won’t affect your sleep. When is the best time to take vitamin D and other fat-soluble vitamins? Vitamin A plays a role in healthy vision, bone and tissue growth, and reproduction. It also helps regu-late your immune system, which prevents and fights infections. Research findings: Although your body can con-vert plant sources of beta carotene into vitamin A, animal sources of vitamin A are better absorbed. Simultaneous use of iron and vitamin A supplements seemed to be more effective to prevent iron deficiency anemia than the use of these micronutrients alone. Some studies did not include a placebo group and only a few of them assessed vitamin A status of the individuals at baseline. You may need to take vitamin and mineral supplements for various reasons, including: The recommended intake of 27 milligrams (mg) iron per day can be met through most prenatal vitamins How much vitamin C do I need? Adults aged 19 to 64 need 40mg of vitamin C a day. You should be able to get all the vitamin C you need from your daily diet. Vitamin C cannot be stored in the body, so you need it in your diet every day. What happens if I take too much vitamin C? Taking large amounts (more than 1,000mg per day) of vitamin C can Foods rich in vitamin C. Vitamin C has been shown to enhance iron absorption. It captures non-heme iron and stores it in a form that your body can absorb more easily ( 1). Foods high in vitamin C In addition, information is available only on vitamin intakes but not on blood/serum levels.33 Information on reasons for supplement intake is also lacking.33 As most supplements contain multivitamins, supplementation of vitamin B6 and/or B12 is likely to be taken with vitamin D and calcium.48 We assume that multivitamin supplements are pmdm8g.