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The sun doesn’t shine all the time, and it’s possible you don’t always get enough vitamin D from food. We chose products that had great reviews from A LOT of people. Supplements are a dime a dozen - one Google search will show you thousands to choose from. For that reason, we only included vitamin D3 supplements. Supplements can be made with either D2 or D3, but most research shows that vitamin D3 increases the level of vitamin D in your blood to a greater extent and for longer than D2 does. The only difference is in the chemical side chains, but both are well absorbed in your gut. There are actually two forms of vitamin D - D2 (ergocalciferol) and D3 (cholecalciferol). We included products only from companies that passed this process and have strict standards for quality and purity. This process checks whether companies are doing anything shady (like saying its products cure certain diseases), whether their products use evidence-based ingredients, and whether they’ve received any FDA/FTC warning letters. We put all the products through a rigorous medical and business vetting process. Knowing that this is something you’re going to be putting in your bod, we held our picks to high standards. doi:10.1097/MD.How we chose our best vitamin D supplements

Effect of vitamin D3 on self-perceived fatigue: A double-blind randomized placebo-controlled trial. Vitamin D toxicity–a clinical perspective. Marcinowska-Suchowierska E, Kupisz-Urbańska M, Łukaszkiewicz J, Płudowsk P, Jones G. Evidence for the treatment of osteoporosis with vitamin D in residential care and in the community dwelling elderly. The effect of vitamin D3 on blood pressure in people with vitamin D deficiency: a system review and meta-analysis. Comparison of vitamin D2 and vitamin D3 supplementation in raising serum 25-hydroxyvitamin D status: a systematic review and meta-analysis. Screening for vitamin D deficiency in adults: US Preventive Services Task Force recommendation statement. US Preventive Services Task Force, et al. Vitamin D: fact sheet for health professionals. National Institutes of Health Office of Dietary Supplements.