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Get Free Weekly Health Tips from Dr. Hyman\nSign Up For Dr. Hyman\u2019s Weekly Longevity Journal\nGet ad-free episodes & Dr. Hyman+ audio exclusives\nIn the US alone, 70% of Americans have either deficient or suboptimal levels of vitamin D. This is a massive problem given vitamin D's impact on our health and its effects on our gene regulation and expression. Vitamin D also regulates calcium and supports the functioning of the immune system, making it one of the most important biological compounds in the body.\xa0\nIn today\u2019s episode of a new series I\u2019m calling Know Your Numbers, I dive deep into vitamin D. I discuss why vitamin D deficiency is a problem, how conventional medicine misses the mark in measuring vitamin D levels, how Functional Medicine treats vitamin D deficiency, and much more.\nYou can test your vitamin D levels with Function Health, a company I co-founded. It has been a lifelong dream for me. Function is the first-ever membership that includes 100+ lab tests and personalized insights from globally renowned doctors based on your results. Join Function at FunctionHealth.com.\nThis episode is brought to you by Mitopure and AG1.\nSupport essential mitochondrial health and save 10% on Mitopure. Visit TimelineNutrition.com/Drhyman and use code DRHYMAN10.\nGet your daily serving of vitamins, minerals, adaptogens, and more with AG1. Head to DrinkAG1.com/Hyman and get 10 FREE travel packs with your first order.\xa0\nHere are more details from the episode (audio version / Apple Subscriber version):\n\nWhy vitamin D deficiency is a problem (5:49 / 3:31)\n\nWhat is vitamin D and what does it do in the body? (6:24 / 4:06)\n\n\u201cNormal\u201d vs. optimal vitamin D references ranges (9:03 / 6:45)\n\nHow much vitamin D should you take? (15:06 / 12:48)\n\nRoot causes of low levels of vitamin D (17:23 / 15:05)\n\nTesting your vitamin D with the 25-hydroxy vitamin D3 test (26:04 / 23:46)\n\nSymptoms of and diseases associated with vitamin D deficiency (26:27 / 24:09)\n\nAddressing vitamin D deficiency with diet, lifestyle and supplementation (42:53 / 40:35)\n\n\nReferences for research mentioned in this episode can be found here.\n\n \nLearn more about your ad choices. Visit megaphone.fm/adchoices