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Vitamin D3 and K2 | Why the partnership?

Vitamin D3 and K2 | Why the partnership?

Vitamin D3 and Vitamin K2 make great partners. Have you heard?

Some of you have. Search engine volumes on Google show the following phrases people have searched for and their respective increases:

 Vitamin d3k2 +60% (last 3 months)  +233% (last year)
d3k2 +23% (last 3 months)  + 56% (last year)


What's the big deal? Well, it is kind of a big deal, which is why we have had vitamin D3 and vitamin K2 in our Testosterone & Immunity Formula all along.

Here is what you need to know.

Certain vitamins can exhibit a synergistic relationship, working hand in hand to optimise well-being. The duo of Vitamin D3 and Vitamin K2 is a good example.

Individually, these vitamins play crucial roles in various bodily functions, but together their combined benefits amplify, offering a potent blend of support for overall health.


Vitamin D3: The "sunshine vitamin," is synthesized by the skin on exposure to sunlight. D3 is essential for calcium absorption in the gut, promoting bone health, supporting immune function, and regulating mood.

Vitamin K2: Vitamin K2 is less well-known, but equally vital. K2 supports the activation of proteins that regulate calcium deposition in bones and prevent its accumulation in arteries and soft tissues. This in turn helps maintain cardiovascular health, bone strength, and overall structural integrity.


The synergy between D3 and K2 is rooted in their shared involvement in calcium metabolism.

D3 enhances calcium absorption, while K2 ensures the calcium is directed to the appropriate locations in the body, such as the bones and teeth while preventing its deposition in arteries and tissues where it can cause harm.

Without sufficient vitamin K2, excess calcium may accumulate in arterial walls, leading to arterial calcification, a risk factor for cardiovascular diseases.

Taking Vitamin D3 without an adequate intake of Vitamin K2 could potentially exacerbate this issue.

D3K2 Benefits

  1. Bone health: Promotes optimal bone mineralization, reducing the risk of fractures and osteoporosis.

  2. Cardiovascular support: Help prevent arterial calcification, thus supporting cardiovascular health and helping reduce the risk of heart disease.

  3. Immune function: D3 plays a crucial role in modulating immune responses, while K2 contributes to overall cellular health, potentially enhancing immune function.

  4. Mood regulation: D3 is implicated in mood regulation, and its synergy with K2, may offer additional support for mental well-being.

RDI (Rec. Daily Intake)

The RDI varies depending on factors such as age, health status, and sun exposure. According to the Department of Health & Aging of Australia, the following guidelines are given for RDI (more like lower limit) and the UL (Upper limit): 

  • Vitamin D3: The RDI for adults is around 800 IU (International Units) per day, some individuals may require higher doses, especially where there is limited sun exposure or certain medical conditions. UL is around 4,000 IU. Testosterone & Immunity Formula has 1,000 IU which is the maximum allowed by the TGA (Therapeutic Goods Administration) in Australia.

  • Vitamin K2: There is no established RDA for vitamin K2, but a daily intake of around 100-200 micrograms (mcg) is provided by Harvard Health. Testosterone & Immunity Formula has 90 mcg of Vitamin K2.


Incorporating vitamin D3 and vitamin K2 into your daily regimen can offer a multitude of health benefits:

  • Supporting bone and cardiovascular health
  • Boosting immune function
  • Mood regulation

By recognising the synergistic relationship between these two vitamins, you can take proactive steps towards optimising well-being.

Always however, consult with a healthcare professional to ensure it aligns with your individual health needs and goals.

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