What is vitamin D3?

Vitamin D is a fat-soluble vitamin, which means that it requires fat to be broken down and utilised. Fat-soluble vitamins can also be stored in the fat cells for later use.

Vitamin D is synthesised by the skin following sun exposure and is then converted by the liver and kidneys into ‘active vitamin D’ or calcitriol.1

There are two types of vitamin D - vitamin D2 (ergocalciferol) - found in plants such as mushrooms, and vitamin D3 (cholecalciferol) - through sun exposure to skin, along with animal sources such as fatty fish.1

Why is vitamin D3 so important?

Vitamin D has a wide range of important functions within the human body. Most notably, vitamin D supports calcium absorption which helps to maintain healthy teeth and bones. Getting enough vitamin D alongside calcium, exercise and a healthy diet can help to reduce the risk of developing osteoporosis.2

When it comes to immune function, vitamin D is essential. Vitamin D supports the production of pathogen-fighting immune cells, while also reducing the risk of damage by inflammation-causing white blood cells.3

The source

Our vitamin D3 is produced from a 100% non-GMO algae source. It is a completely plant-sourced vitamin D3 which has significantly greater bioavailability than vitamin D2.4

Optimal dosage

With a range of factors influencing individual vitamin D levels, it’s important to look to optimal levels, rather than adequate intake (AI). Consider your intake of vitamin D through food sources, as well as sun exposure through the seasons when deciding if a supplement is right for you.


Adults 19-50 years - 5 micrograms

Adults 51-70 years - 10 micrograms

Adults 70+ years - 15 micrograms

Pregnancy & lactation - 5 micrograms.

Why do you need to supplement vitamin D3?

Despite the main source of vitamin D - sunlight - being free and accessible to almost everyone, more than half of the world’s population has insufficient levels. It’s also estimated that roughly 1 billion people across the globe have a clinical vitamin D deficiency.5,6

Why is low vitamin D so prevalent? Lifestyle (i.e. more time spent indoors) and environment (air pollution) have resulted in a significant drop in sun exposure.5,6 Dietary intake of vitamin D also tends to be low across the board and can be influenced by a number of other factors - not just whether or not you eat animal products, but how much time you spend outdoors, if you wear sunscreen, even weight can have an impact on vitamin D levels.

Interesting facts about vitamin D3

  • In Australia, vitamin D levels have been shown to sharply decline during the winter months. At the end of the winter, 36% of Australians were vitamin D deficient, compared to just 14% at the end of the summer.7
  • Darker skin pigment makes it more difficult for the body to synthesise vitamin D via sunlight exposure.8
  • As well as being a vitamin, D3 is also considered a hormone that plays many important roles in the body, including in the endocrine (hormonal) system.9


  1. National Health and Medical Research Council. Vitamin D. Updated April 2014, accessed July 2022 from https://www.nrv.gov.au/nutrients/vitamin-d
  2. Jin, J. (2018). Vitamin D and calcium supplements for preventing fractures. JAMA, 319(15):1630.
  3. Cannell, J.J., Vieth, R., Umhai, J.C., Holick, M.F., Grant, W.B., et al. (2006). Epidemic influenza and vitamin D. Epidemiology & Infection, 134(6):1129-40.
  4. Vitamin D3V®. 100% Vegan Vitamin D3. Accessed July 2022 from https://www.vitamind3v.com/
  5. Nair, R. & Maseeh, A. (2012). Vitamin D: The ‘sunshine’ vitamin. Journal of Pharmacology & Pharmacotherapeutics, 3(2):118–26.
  6. Al-Daghri, N. M., Al-Attas, O., Yakout, S., Aljohani, N., Al-Fawaz, H. & Alokail, M. S. (2015). Dietary products consumption in relation to serum 25-hydroxyvitamin D and selenium level in Saudi children and adults. International Journal of Clinical and Experimental Medicine, 8(1): 1305.
  7. Australian Bureau of Statistics. Australian Health Survey: Biomedical Results for Nutrients. Written December 2013, accessed July 2022 from ​​https://www.abs.gov.au/statistics/health/health-conditions-and-risks/australian-health-survey-biomedical-results-nutrients/latest-release
  8. Skin Health Institute. Your skin, vitamin D and the sun. Accessed July 2022 from https://www.skinhealthinstitute.org.au/page/79/your-skin-vitamin-d-and-the-sun
  9. Your Hormones. Vitamin D. Reviewed February 2018, accessed July 2022 from https://www.yourhormones.info/hormones/vitamin-d/