Vitamin D3 is an essential nutrient created in the body by converting naturally present cholesterol via sunshine. A majority of the population, however, is deficient in adequate Vitamin D levels due to environmental impacts and the lack of exposure to direct sunlight.* Supplementing with Nature's Lab Vitamin D3 is a convenient way to increase your daily intake of this important nutrient.* Nature's Lab Vitamin D3: Contains 5,000 IU (125 mcg) Vitamin D3 as cholecalciferolHelps support bone, teeth, muscle and immune system*Promotes calcium absorption* Vitamin D refers to a group of fat-soluble secosteroids that play a role in increasing intestinal absorption of calcium, iron, and other essential minerals and nutrients.* Unlike most other vitamins, the body can make its own vitamin D when skin is exposed to sunlight. This is why vitamin D3 is often referred to as "the sunshine vitamin." Vitamin D3 is the most active form of vitamin D and helps support calcium levels in the blood and bones and also supports the immune system.* However, most individuals do not get enough vitamin D3 from sunlight, and vitamin D is hard to find in plentiful amounts from food sources. Vitamin D3 helps the body absorb the minerals calcium and phosphorus from foods, both of which may be important for developing the structure and strength of bones and teeth.* Additionally, vitamin D3 may help regulate neuromuscular function and protein synthesis, both of which may support muscle function.* *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Nature's Lab. Superior Ingredients. Superior Products. At Nature's Lab, we take pride in providing high-quality supplements you can depend on. We work hard to keep the trust and loyalty of our customers by dedicating ourselves to consistency and science at every stage - from initial research all the way to your doorstep. Nature's Lab only sells products that we trust and use. With our dedication to wellness in mind, Nature's Lab makes a promise to provide quality dietary supplements for years to come. In the face of socio-economic changes such as fast-paced lifestyles, soil depletion, non-organic food sourcing and more, diet alone can be an insufficient solution. Our supplements are created to help make wellness goals attainable for our customers for generations to come. Manufactured in the USA with Imported and US Ingredients Nature's Lab manufactures supplements in our state-of-the-art in-house facility and lab located in Las Vegas, Nevada using U.S. and world-sourced ingredients. We don't compromise on people, products, or purity. Neither should you when shopping for supplements!