Vitamin D Supplements
Is it necessary to take vitamin D supplements? Vitamin D, which is made mostly by animals, including ourselves, when we’re exposed to sunlight, may help us enjoy a longer life based on randomized, controlled studies. It’s also been shown to improve pain from menstrual periods and help prevent respiratory infections.
If you don’t get adequate sun exposure, I recommend 2,000 IU vitamin D supplements daily, ideally with the largest meal of the day.
Mushrooms, interestingly, also make vitamin D when exposed to sunlight radiation, but most mushrooms found in the produce section of our local markets don’t have any vitamin D because they’re grown in the dark. I also don’t recommend tanning beds because they can be both ineffective and dangerous. (The lamps emit mostly UVA, which increases melanoma skin cancer risk while producing less vitamin D.)
Note that the longevity effects appeared limited to vitamin D3, though, the type derived from plants and animals—not vitamin D2, the type derived from yeast and mushrooms.
For an overview, see Dr. Greger’s Vitamin D Recommendations infographic.
The information on this page has been compiled from Dr. Greger’s research. Sources for each video listed can be found by going to the video’s page and clicking on the Sources Cited tab. References may also be found at the back of his books.
Popular Videos for Vitamin D Supplements
Do Vitamin D Supplements Reduce the Risk of Dying from Cancer?Sun exposure is associated with lower rates of 15 different cancers and improved cancer survival....
The Risks and Benefits of Sensible Sun ExposureWe don’t have to choose between the lesser of two evils: skin cancer versus internal...
The Best Way to Get Vitamin D: Sun, Supplements, or Salons?If one is going to make an evolutionary argument for what a “natural” vitamin D...
The Optimal Dose of Vitamin D Based on Natural LevelsWhy do some recommend thousands of units of supplemental vitamin D when the Institute of...
How Much Vitamin D Should You Take?The safe dose of vitamin D supplementation to get most of the population to the...
Will You Live Longer if You Take Vitamin D Supplements?What do 56 randomized clinical trials involving nearly 100,000 people between the ages of 18...
Do Vitamin D Supplements Help with Diabetes, Weight Loss, and Blood Pressure?Those with higher vitamin D levels tend to have lower rates of obesity, diabetes, and...
The Best Supplement for FibromyalgiaVitamin D supplements are put to the test for fibromyalgia.
All Videos for Vitamin D Supplements
Potential Vitamin and Mineral Deficiency Risks on a Vegan Diet
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Are Supplements and Vitamins B12 and D Really Necessary on a Plant-Based Diet?
I answer common questions about supplements, vitamin B12, and vitamin D. Do we need them?
Vitamin D May Explain Higher Bone Fracture Risk in Vegans
A combination of low calcium intake and low vitamin D exposure may explain higher bone fracture rates in British vegans.
Do Vegans Have Lower Bone Density and More Fractures?
What are the bone fracture rates of omnivores vs. vegetarians vs. vegans?
The Purported Benefits of Vitamin K2: Should You Take Supplements?
Our body can make vitamin K2 from the K1 in green leafy vegetables.
Are Vegans at Risk for Iodine Deficiency?
Most plant-based milks are not fortified with iodine.
Are There Health Benefits of Spending Time in Nature?
Studies on green exercising, the value of greenspaces, or even just viewing trees outside the window on surgery recovery.
Vegetarians and Stroke Risk Factors—Omega 3s?
Does eating fish or taking fish oil supplements reduce stroke risk?
Vegetarians and Stroke Risk Factors—Vitamin D?
Could the apparent increased stroke risk in vegetarians be reverse causation? And what about vegetarians versus vegans?
Dietary Supplements for Autism
Vitamin C, vitamin D, and omega-3 fish oil supplements put to the test to improve the core symptoms of autism spectrum disorder.