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July 28, 2025 5 mins

Vitamin D deficiency is not always easy to detect. Blood tests do not reflect what's going on deeper in your cells.



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.



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.



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.



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.



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.



Dr. Eric Berg DC Bio:

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.

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