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Where does our vitamin D come from?
Nutri Advanced use the cholecalciferol (vitamin D3) form of vitamin D which is the form your body makes in response to sunlight. This is sourced from sheep wool, also known as lanolin.

How long would I need to take vitamin D for?
Our body naturally makes large amounts of vitamin D when the skin is exposed to sunshine but living in the UK we tend not to get enough exposure. Therefore it is ideal to supplement with a maintenance dose of 1000-2000iu long term or especially between the months of October to March when our exposure to sunlight is low.

What are the signs and symptoms of vitamin D deficiency?
Typical symptoms include the following:

- muscle/joint pain and weakness
- tiredness or fatigue
- bone pain
- depression

To find out if you have a deficiency, a simple blood spot test can be carried out.

At what age should you start taking vitamin D?
Vitamin D can be taken from birth. Ensuring children get their daily requirement of vitamin D is imperative as deficiency can cause a condition called rickets.This is a condition that affects bone development in children causing the bones to become soft and weak, leading to bone deformities. The daily requirement for children is 400-600iu but the daily optimum is 1000iu.(1)

What other nutrients does vitamin D support?
Vitamin D works best alongside some other nutrients known as cofactors. The most important nutrients include magnesium, vitamin K, zinc, boron and vitamin A.

Which vitamin D supplement should I take?
Vitamin D as cholecalciferol (vitamin D3) is the best way to supplement as this is the form made by the body in response to sunlight.  

Why do you include vitamin K in your supplements?
Vitamin D and vitamin K are two nutrients that work very closely together. Whereas vitamin D helps with calcium absorption, vitamin K is important in making sure that the calcium derived from food and supplements is used in the bones.

Is it vegetarian/vegan?
Vitamin D3 is certified vegetarian but not vegan as it is derived from sheep wool.

Is your Vitamin D range Kosher/Halal certified?
We do not hold Kosher/Halal certification for our vitamin D.

1. Holick MF, Binkley NC, Bischoff-Ferrari HA, Gordon CM, Hanley DA, Heaney RP, Murad MH, Weaver CM. Evaluation, treatment, and prevention of vitamin D deficiency: an endocrine society clinical practice guideline. J Clin Endocrinol Metab. 2011 Jul;96(7):1911-30.

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Nutri Advanced has a thorough research process and for any references included, each source is scrutinised beforehand. We aim to use the highest value source where possible, referencing peer-reviewed journals and official guidelines in the first instance before alternatives. You can learn more about how we ensure our content is accurate at time of publication on our editorial policy.