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Vitamin D Frequently Asked Questions

Vitamin D Frequently Asked Questions

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.