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Doctor's Best

Doctor's Best, Vitamin D3, 2000IU, 180 soft gels

Clearance (expiration date: 09-30-2024)
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Product Code: DB0210
UPC Code: 753950002104

  • Science-based nutrition
  • Dietary supplement

Vitamin D3 (cholecalciferol) is a nutrient that is critical to many bodily functions. Vitamin D3 is beneficial for supporting bone health, immune wellness, cardio- vascular function, and cellular metabolism, among others. Mounting research is highlighting the ever-increasing benefits of optimal vitamin D3 status. Vitamin D3 is known to interact with over 200 different genes and thus plays a crucial regulatory role as a metabolic activator for a multitude of metabolic processes.


180 soft gels


Vitamin D is a nutrient that is critical to many bodily functions. Vitamin D is beneficial for supporting bone health, immune wellness, cardiovascular function, and cellular metabolism. Mounting research is highlighting the ever-increasing benefits of optimal vitamin D status. Scientific studies have demonstrated that vitamin D levels are often low in the general population. The standard assessment for vitamin D levels is measuring the level of the marker 25(OH) D3 in the blood. Researchers suggest that levels between 50 and 80 ng/mL are optimal for supporting health.1Vitamin D is known to interact with over 200 different genes and thus plays a crucial regulatory role as a metabolic activator for a multitude of metabolic processes. Common supplemental forms of Vitamin D include D3 (cholecalciferol) and D2 (ergocalciferol). Vitamin D3 is the naturally-occurring form in humans. Research shows that supplemental vitamin D3 (cholecalciferol) is significantly more efficient at converting to active vitamin D in the body than vitamin D2 (ergocalciferol).1This makes vitamin D3 the preferred supplemental form of this nutrient. Vitamin D is essential for life. It regulates calcium homeostasis in the human body, which is of vital importance as calcium is involved in the function of all cells. Calcium balance is also essential for bone growth and formation, as well as for the function of the nervous system. Vitamin D has been shown in multiple studies to support healthy bone structure. However,over the last several years,more and more research has focused on other critical functions of this hormone-like vitamin. Vitamin D plays a role in most organs and systems of the body. Like other hormones, vitamin D acts as a "molecular switch" by influencing the expression of multiple genes.1Thus, activated vitamin D not only influences bone health, but is involved in supporting the function of the immune system, cardiovascular system, respiratory system and the musculoskeletal system, among others. Added to the knowledge of how vitamin D can affect the function of various organs throughout the human body is research showing that a majority of individuals are not getting optimal levels of this crucial "supervitamin" on a daily basis, placing them at risk for deficiencies. While we obtain some vitamin D from our diet, the major source for replenishment of vitamin D levels is exposure of the skin to sunlight. Adequate daily sun exposure is considered to be sufficient to fulfill the human requirement for vitamin D. However, a number of factors affect our ability to refresh our vitamin D supplies. First, due to the climate we live in, sun exposure is not always possible year-round. This is the case especially in northern latitudes and much of the northern United States. Second, direct sunlight exposure on the skin is needed for vitamin D production to occur. Covering skin with sunscreens and other topical products prevents the necessary exposure from occurring. Skin color is also a factor when it comes to adequate vitamin D production. Individuals with darker skin require longer sun exposure than individuals with lighter skin to produce the same amount of vitamin D. Furthermore, UV rays from the sun do not penetrate indoors through windows. Since UV light is required for vitamin D synthesis in skin, being indoors leads to no production of vitamin D. For one or more of these reasons, we often fail to meet our vitamin D requirements for health. The second common source of vitamin D is from dietary intake. However, few foods are naturally high in vitamin D, with fish and seafood being the richest source.2Adequate intake levels for vitamin D have been established by the Food and Nutrition Board (FNB) at the Institute of Med of The National Academies. For adults between 19 and 50 years of age, the FNB advises an intake of 200 IU per day, while for individuals aged 51 to 70 years, an intake of 400 IU per day is recommended. Recent studies have shown that these levels are often woefully inadequate for assuring optimal vitamin D status and for achieving the health benefits associated with adequate vitamin D levels. Some researchers suggest that a minimum daily intake of 1,000 IU is necessary to maintain barely adequate blood levels of vitamin D.3Others agree that significantly higher doses are needed to ensure levels are optimal enough to promote health.1

About Doctor's Best

Founded in 1990 by supplement industry veteran Ken Halvorsrude and a wholistic physician, San Clemente-based Doctor's Best, Inc. manufactures and distributes dietary supplements throughout the US and overseas. Doctor's Best is known for high-quality products that are based on sound research in the field of nutritional science.


Do not use if pregnant or nursing. Keep out of reach of children. Please consult your health care provider if currently under care or treatment. Do not exceed recommended serving. See product packaging for additional safety information.


Individual results may vary. This product is not intended to diagnose, treat, cure or prevent any disease. The statements on this website and all affiliates have not been evaluated by the FDA. Advice on treatment or care of an individual patient should be obtained through consultation with a trained health care practitioner.

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