Vitamin D – why the NHS says it is the only supplement we need

However sceptical you might be about vitamin supplements, it seems there is one exception: Vitamin D which, despite its name, is not a vitamin but a hormone that promotes the absorption of calcium, magnesium, and phosphate in our bodies. These nutrients are vital for the health of our immune system, bones, teeth and muscles. In children, Vitamin D deficiency causes rickets, where bones become soft, weak, deformed, and painful.

We mainly get Vitamin D from sunlight, fatty fish and, in smaller amounts, beef liver, cheese and egg yolk so it is not easy to get enough from our diets alone.  It is the only vitamin supplement that the NHS recommends every adult take, namely a 10-microgram supplement in autumn and winter. This has recently been extended to a recommendation of year-round supplementation in view of potentially decreased sun exposure during the lockdown. Some articles, including this one by the BBC, state that from studies:”around 20% of the UK has a profound Vitamin D deficiency.”

The benefits of Vitamin D on the immune system have long been recognised, for instance in relation to immune disorder disease multiple sclerosis. According to the Mayo Clinic research over the years has shown that maintaining adequate levels of Vitamin D may have a protective effect and lower the risk of developing multiple sclerosis (MS). A number of studies have shown that people who get more sun exposure and vitamin D in their diet have a lower risk of  MS.” It is also worth noting that MS is not found at all near the equator where sun exposure is very high.

Another key sign that you may want to consider Vitamin D supplements is constant fatigue and muscle ache. It is apparent that those that suffer from these effects, when taking Vitamin D supplements, can see benefits within five weeks of taking them. And even in the most extreme of cases, studies of cancer patients have found similar effects. Vitamin D may also help bolster and regulate the immune system by clearing bacteria.

We get considerably less sun than our ancestors used to because here in the northern hemisphere our sunlight levels are much lower than the equator, especially in winter. People nowadays are also a lot more likely to spend more time indoors on their computers or games consoles. It could benefit anyone who prefers to remain indoors to consider Vitamin D supplements.

But with so many products on the market, what kind of supplements should you take?

Nutritionist advice on Vitamin D supplements

We spoke to local nutritionist Sam Silvester who made the following suggestions.

“Vitamin D2 comes from plant sources so is cheaper to produce, and is the most common form of Vitamin D included in fortified foods. However Vitamin D3 is what our skin produces in response to sunlight and therefore what we lack most. Vitamin D3 is usually animal-based, made from lanolin washed from lambs’ wool. There is aslo a vegan source of Vitamin D3 from lichen. This article compares the two.

“Whilst the NHS recommends 400 IU (International Units) per day in liquid or tablet form, in the winter nutritionists recommend an optimal dose of 2,000 IU per day which is 50ug (micrograms): 1 microgram of Vitamin D = 40 iu. People with darker skins may be more deficient and have a higher need during the winter. Some people with auto immune conditions may also need more.

“During the summer months this can be reduced to 400 IU per day unless you are someone who stays inside, covers up, has dark skin or uses sunscreen to cover any exposed sun.  Since Vitamin D reacts on exposed skin, just being out in the sun but covered up will not increase absorption.  If you are a sun worshipper, like me, you can stop Vitamin D in the summer unless we are unlucky to have bad weather.

“Vitamin D is excellent at helping us absorb calcium, so therefore overdosing on Vitamin D can cause a build up of calcium leading to kidney stones or calcification of the arteries or soft tissues, so do stay within the recommended optimal dose.  You can get home prick test from places such as  to test your levels of Vitamin D if you are worried that you are deficient or having too much.”

To find out more please feel free to contact:

Samantha Silvester MBANT CNHC, Registered Nutritional Therapist
07767 260 374


Photo credit: Liam Heisig


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