I Love Vitamin D, but watch out for Vitamin A in your multivitamin

I Love Vitamin D, but watch out for Vitamin A in your multivitamins
Robert G Carlson, MD, FACS


No other nutrient, hormone or even drug has gained so much scientifically supported credibility than Vitamin D, demonstrating reductions in cancer, heart disease, blood pressure, chronic inflammation, diabetes, viral infections and the autoimmune diseases( arthritis, Lupus, Hashimoto’s thyroiditis). Even though Vitamin D has been shown to be so incredibly beneficial , it is often in very low doses in standard multivitamins, and often side by side with high doses of Vitamin A. Unfortunately some forms of Vitamin A actually BLOCK the benefit of Vitamin D. So grab your multivitamin bottle and look at how much vitamin D and Vitamin A is in it. Most multivitamins have woeful amounts of vitamin D , often ranging from 200 units to 1000, but we should be taking at least 5000 units a day and now more studies show absolutely no toxicity at 10,000 units(should consider this dose in the fall/winter months) and incredible benefits. So what about Vitamin A? The preformed Vitamin A (retinols) are often excessive in multivitamins and having Vitamin A in the beta-carotene form is the form you want. “Preformed” vitamin A comes only from animal products, fortified foods, and supplements. It is most commonly measured in International Units (IU). The Recommended Dietary Allowance (RDA) for vitamin A is 2,310 IU daily for women, 3,000 IU for men, although some food products identify the recommended dose as 5000 IU. Watch out because preformed Vitamin A is not your friend. Studies have proven that too much preformed Vitamin A results in a two fold increase in hip fractures, and a 16 % increase in total mortality, undoubtedly because it blocks all the amazing benefits of Vitamin D. Keep that form of Vitamin A no higher than 1000 IU. Now if the Vitamin A is in the beta-carotene form, there are fewer issues because it is found in plant foods, especially dark green and highly colored vegetables and fruits. It is converted to vitamin A only as our body needs it. Therefore one can’t get dangerous levels of vitamin A by consuming too much beta carotene. By the way that foul tasting modern day Cod Liver oil has up to 10,000 units of preformed Vitamin A….so don’t drink that stuff!