The Barter Protocol D3K2 is a highly bioavailable form of Vitamin D that provides 125 mcg (5,000 IU) per softgel.
Vitamin D is a term that refers to a group of five fat-soluble vitamins that are classified as secosteroids, with research suggesting vitamin D3 (cholecalciferol) as being the most important form in humans. Since we produce much of our natural vitamin D transdermally (through the skin) via sunlight exposure, it is imperative that oral supplementation of vitamin D come in the form of D3. This is the most bioavailable form of vitamin D in a softgel, maximizing its absorption into the body.*
Vitamin D3 is structurally similar to cholesterol, and is converted via the liver and kidneys to its active form calcitriol. Calcitriol goes on to perform a multitude of roles in the body, and is particularly crucial for proper absorption of the minerals calcium, iron, magnesium, phosphate and zinc. Calcitriol also regulates bone growth and regeneration, as well as immune, cardiac, and neuromuscular functions.*
Given the importance of adequate Vitamin D levels in the body and many people’s lack of exposure to direct sunlight, D3 5000 supplementation can help users in a variety of ways.
We stand behind our supplements and want you to feel confident in your purchase. For safety and product integrity, we accept returns on unopened and unused products within 30 days of purchase. To qualify for a return, the product must be sealed in its original packaging, the safety seal must remain intact, and proof of purchase (your original receipt) is required.
At Alternative Family Medicine & Chiropractic, we restore balance through root-cause, patient-centered care. Our supplements support this greater mission, integrating with functional testing, nutrition, chiropractic, and personalized guidance to empower holistic health and lasting vitality.

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