Nutrients rarely work in isolation and many metabolic processes require a combination of different vitamins and minerals to function effectively.  Maintaining sufficient Vitamin D levels relies on adequate magnesium intake.

Magnesium is needed to activate enzymes in the liver and kidneys that convert vitamin D3 into cholecalciferol, the active form of vitamin D that can be utilized by the body. Lack of adequate magnesium levels can lead to a vitamin D deficiency even if you have plenty of sun exposure or are taking vitamin D supplements. 
 
Low vitamin D levels can impair intestinal magnesium absorption, which increases the risk of magnesium deficiency and conseqeuntly can worsen vitamin D deficiency.
 
In addition, vitamin K2 works in synergy with vitamin D to maintain calcium balance and regulate the deposition of calcium into bone tissue. While vitamin D3 helps your body absorb more calcium, vitamin K2 helps your body transport it to your bones and teeth rather than letting it sit in your arteries and other soft tissues in your body. 
 
Both vitamin D3 and vitamin K2 are fat-soluble vitamins that play essential roles in many physiological functions, and combining these two nutrients can enhance their effectiveness and health benefits. It is therefore essential to ensure that the recommended amount of magnesium and vitamin K2 is consumed to obtain the optimal benefits of vitamin D.
 
May assist with:
Calcium absorption for supporting bone formation
Prevent arterial calcification
Enhancing bone mineralisation
Reducing your risk of heart disease and depression
Weight loss by reducing insulin resistance
Benefit skin health by enhancing collagen production and skin elasticity, which can help improve the appearance of wrinkles.
Improve Vitamin D status which is important to help limit estrogen-related breast cancer