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  • Writer's pictureSamantha Varriale

Vitamin D Fact Sheet

Updated: Jan 28, 2021

Vitamin D deficiency is extremely common in the UK and has been linked to the following health issues:

  • Poor immune function - getting sick often

  • Fatigue & tiredness

  • Low mood & depression

  • Constipation & IBS

  • Low bone mineral density

  • Hormone imbalances

What is vitamin D?

  • Vitamin D is a fat-soluble vitamin, meaning it’s absorbed by the body through fatty tissue and then stored in these tissues or the liver

  • It is made in the body from cholesterol when the skin is exposed to natural sunlight (without sunscreen)

  • Unlike most vitamins, vitamin D functions more like a hormone: every cell in your body has a receptor that allows it to absorb the mineral

What does vitamin D do?

  • activates cells that fight infection and reduce inflammation

  • maintains and builds bone strength by aiding the absorption of calcium from your gut and kidneys

What foods contain vitamin D?

Vitamin D is found mainly in animal products such as:

  • Fish such as salmon, mackerel, sardines and tuna

  • Eggs

  • Milk, butter and cheese

  • Fortified foods

  • Mushrooms

If you are vegetarian or vegan, it’s likely that you’ll need to supplement to get the right level of vitamin D.

Other vitamins linked to Vitamin D

  • Magnesium assists in the activation of vitamin D in the body

  • Vitamin D stimulates the absorption of calcium, which is important for bone health

Vitamin D deficiency - who is at greatest risk?

  • Anyone who lives in the northern hemisphere - that includes the UK

  • If you spend most of your time indoors

  • Those who eat very little fish or dairy

The link between vitamin D and overall health:

Some studies have shown that low levels of vitamin D have been linked to a number of medical conditions including:

  • Heart conditions

  • Autoimmune disease

  • Type 2 diabetes

  • Depression

  • Dementia and Alzheimer’s

It is not possible to say that vitamin D deficiency causes any of the list above, but there is a scientific rationale to keeping your vitamin D levels optimised.

What are the UK guidelines?

The NHS recommends that from October to March, everyone should consider supplementing with Vitamin D and there is special advice for babies, infants, children and breastfeeding women. Read the current guidelines here:

How do I get tested?

Your GP can arrange a blood test for vitamin D or it can be arranged privately via a Registered Nutritional Therapist as part of a consultation. It’s important to know your current level of vitamin D to determine the level of supplementation required; levels may be considered “normal” or “adequate”, but Nutritional Therapists aim for optimal levels of nutrients for the best possible health.

To book a discovery call to understand how Nutritional Therapy may help you feel better, email

The content on this webpage is not intended to constitute or be a substitute for professional medical advice, diagnosis, or treatment.

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