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Vitamin D3, 5,000 IU, 120 Veg Caps

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Vitamin D3, the preferred bioavailability form, supports cell growth, immunity, and energy metabolism. It also plays an essential part in calcium absorption and bone density health.
Tablet Size: 4C
Retail $15.99
Our Price $4.49

Availability: Usually Ships in 1 to 2 Business Days

Description Supplement Facts


  • Supports strong bones, mineral balance, and gene regulation.
  • Fortifies the immune system and supports cell growth.

Product Information

Vitamin D is a fat soluble vitamin found in some plant and animal sources, but primarily produced by the body after exposure to the sun’s ultraviolet (UV) rays. UV rays promote the skin’s production of vitamin D. Vitamin D3 or calciferol is the most active form, while vitamin D2 or ergocalciferol is synthesized by plants and less available to humans (in fact, studies cited in the Journal of Clinical Endocrinology & Metabolism, indicate that Vitamin D3 is 87% better in humans, in terms of absorption and bioavailability, than D2).

Vitamin D functions primarily to maintain normal blood levels of calcium and phosphorus. By supporting healthy calcium absorption, vitamin D helps to maintain strong bones. Vitamin D also works synergistically with other vitamins, minerals, and hormones to promote bone mineralization. Unfortunately with aging, skin cannot synthesize vitamin D from the sun as efficiently.

Vitamin D has more recently been in the spotlight for immune system support. Vitamin D is thought to promote immune health by supporting regulation of cell growth and differentiation—the process that determines cell’s “job” in the body. This regulation is particularly important as the differentiation of cells leads to a decrease in proliferation. Cellular proliferation, while essential for growth and wound healing, may foster harmful mutations, if uncontrolled.

Vitamin D has also shown great promise in maintaining the body’s innate immune response as well as supporting appropriate autoimmune activity. Both these mechanisms are thought result from vitamin D’s regulation of T cell development.

More recent studies also suggest that Vitamin D may play a role in supporting healthy body fat levels.


  • Vitamin D may worsen hypercalcemia.
  • Hypercalcemina may contribute to arteriosclerosis, particularly in persons with kidney disease. Such members should use supplemental vitamin D cautiously.
  • Vitamin D is one of the oldest hormones, having been produced by life forms for over 750 million years.
  • The skin produces approximately 20,000 IU vitamin D in response 20–30 minutes summer sun exposure - 100 times more than the US government's recommendation of 200 IU per day!
  • Technically not a "vitamin," vitamin D is in a class by itself. Its metabolic product, calcitriol, is actually a secosteroid hormone that targets over 1000 genes in the human body.

Average Customer Review: 5 of 5 Total Reviews: 61 Write a review.

  0 of 0 people found the following review helpful:
recent purchase March 6, 2018
Reviewer: Beverly K. from Bethesda, MD United States  
Always a pleasure doing business with these
fine people.   I trust their product and their
service.    I am sure their Immune Booster
in particular has helped me.

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  0 of 0 people found the following review helpful:
Easy to take D3 May 11, 2017
Reviewer: Philip T. from Laguna Hills, CA United States  
Higher dose in a easy to take pill

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  0 of 0 people found the following review helpful:
Great Suppliment April 7, 2017
Reviewer: Jane T B. from Bluefield, WV United States  
Great addition to daily pills.

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  0 of 0 people found the following review helpful:
Company January 5, 2017
Reviewer: Susan P. from Mableton, GA United States  
Thank you for all your help in taking care of my husband Merry Christmas

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  0 of 0 people found the following review helpful:
Great products, great price September 29, 2016
Reviewer: Nadia L. from Flower Mound, TX United States  
We have been doing business with Our Health Co-op for a long time, they have great products at a great price..The products always come very quickly and in great condition... We look forward to continuing to order from them..We also love the articles and great info on the site...

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