Vitamin D measured in blood is 25(OH)D3 but this article will refer to the active form of Vitamin D3 which is called 1,25(OH)D3 or Calcitriol.
Calcitriol is used primarily in calcium homeostasis, keeping calcium levels balanced, regulating along with co-factors, bone remodelling, which is the breaking down and building up of the skeleton.
Disclaimer
This information is provided for educational and informational purposes only and does not constitute the provision of medical advice or professional services. Amanda King ND is neither a Medical Doctor nor a Naturopathic Doctor. This information does not replace medical care or recommendations from a physician familiar with you, your health and laboratory data, or who is actively providing you with medical treatment. The information provided should not be used for diagnosing or treating a health problem or disease, and those seeking personal medical advice should consult with a licensed physician. Always seek the advice of your doctor or other qualified health provider regarding a medical condition.

From an epigenetics perspective, over 1200 genes are made faster or slower by Calcitriol.
In a nutshell, this means that you need enough of the active form of D3 to be available so your body can work properly!
Here are some of the ways that Vitamin D3 helps to fight against cancer:
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