<p>Vitamin D deficiency is not always easy to detect. Blood tests do not reflect what's going on deeper in your cells.</p><p><br></p><p><br></p><p>Taking too much vitamin D can be dangerous if you have hypercalcemia, or too much calcium in the blood. This can lead to kidney stones. </p><p><br></p><p><br></p><p>A lack of vitamin D is also dangerous! If you’re deficient in vitamin D, you are more susceptible to autoimmune diseases, which is currently the world’s largest health problem. </p><p><br></p><p><br></p><p>Vitamin D is involved in over 2500 genes and is intimately involved in every part of your immune system. You need a maintenance dose of 8,000 to 10,000 IU of vitamin D daily for healthy immune function.</p><p><br></p><p><br></p><p>Many people can not get adequate vitamin D from the sun or their food. Genetic factors can contribute to vitamin D resistance. Low magnesium, zinc, and vitamin K2 can also inhibit the absorption of vitamin D. Certain viruses downgrade vitamin D receptors, weakening your immune function. Our RDAs are also far too low. </p><p><br></p><p><br></p><p>There are several ways to maximize vitamin D benefits while also preventing adverse vitamin D side effects. Take the cofactors magnesium, zinc, and vitamin K2 with vitamin D. Limit your calcium intake, especially when taking a high dose of vitamin D. You can also increase fluid intake to 2.5 liters per day to prevent kidney stones. </p><p><br></p><p><br></p><p>Dr. Eric Berg DC Bio:</p><p>Dr. Berg, age 60, is a chiropractor who specializes in Healthy Ketosis & Intermittent Fasting. He is the Director of Dr. Berg Nutritionals and author of the best-selling book The Healthy Keto Plan. He no longer practices, but focuses on health education through social media.</p>