A bit of house-keeping to get us started on this incredibly powerful post on the ‘vitamin’ that is considered far more effective than the invasive and largely unnecessary flu vaccine.

Vitamin D – or I should say ‘prohormone D’, because you should note that ‘vitamin D’ isn’t actually a vitamin at all…it’s a prohormone, basically a substance that the body converts into a hormone. Which makes sense when you consider only about 10 percent of the vitamin D the body needs comes from food (including dairy products and oily fish, the rest is made inside the body via UV light from the sun.

So… what does this have to do with the Flu?

Quite a lot it might seem. Now we clearly understand the key role that vitamin D has on a healthy immune system, and this too is no surprise considering the vitamin D receptor is expressed on B cells, T cells and antigen presenting cells i.e. our immune cells!

The Journal of Investigative Medicine explains that deficiency in vitamin D is associated with increased autoimmunity (where the body attacks itself e.g. Type I Diabetes and Coeliac Disease) as well as an increased susceptibility to infection.

This infection risk extends directly to Flu it seems according to a number of studies including Laaksi, I., Ruohola, JP., Tuohimaa, P. et al. (2007), and a 2010 study by Urashima, M. et al published in the hugely respected journal the American Journal of Clinical Nutrition (AJCN). In addition to these, a recent systematic review on vitamin D and Inflammatory status found that Vitamin D consistently displayed anti-inflammatory effects in human cells and reducing risk of chronic disease.

In Summary

The outcome of these studies, collaboratively found there to be a reduction in flu prevalence of 57% with adequate vitamin D intake, often achieved through sensible supplementation, whereas the flu jab only presents a 17% reduction in prevalence.

Of course the benefits of vitamin D extend way beyond that of protecting against the flu, you have bone and joint health and more besides to consider…but for these reasons alone, it may pay you (if you’re not already) to consider a quality vitamin D supplement.

Check in for tomorrow’s Daily MANtra for some clear cut, to the point guidance on Vitamin D Supplementation. See you tomorrow guys.


Laaksi I, Ruohola JP, Tuohimaa P, Auvinen A, Haataja R, Pihlajamäki H, Ylikomi T. (2007). An association of serum vitamin D concentrations < 40 nmol/L with acute respiratory tract infection in young Finnish men. Retrieved from,

Mitsuyoshi Urashima Takaaki Segawa Minoru Okazaki Mana KuriharaYasuyuki Wada Hiroyuki Ida. (2010). Retrieved from,

Emily K. Calton., Kevin N. Keane., Philip Newsholme., Mario J. Soares, (2015).
The Impact of Vitamin D Levels on Inflammatory Status: A Systematic Review of Immune Cell Studies. Retrieved from,

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