Vitamin D Supplements


Vitamin D is one of the most commonly low nutrients in UK diets, particularly through autumn and winter when sunlight exposure drops. GreenVits stocks a full range of Vitamin D3 formats, from a standard 1,000 IU (25mcg) daily maintenance dose through to high-strength 10,000, 20,000 and 50,000 IU capsules for those advised by a healthcare professional to correct a significant deficiency.

Our D3 and K2 combination capsules pair Vitamin D3 with Vitamin K2, a nutrient increasingly recommended alongside D3 because of how the two work together in calcium metabolism. All our Vitamin D capsules are made in small, tiny soft vegetable capsules, designed to be easy to swallow.

If you're unsure which strength is right for you, speak to your GP or pharmacist, particularly if you're already taking a high-strength dose or have been advised on a specific target blood level.

Frequently asked questions

How much vitamin D do I need a day?

The NHS says adults and children from the age of 1 need 10 micrograms (400 IU) of vitamin D a day. In the UK, it advises considering a daily supplement during autumn and winter, when there’s less sunlight.

What is the most vitamin D I should take a day?

The NHS advises adults not to take more than 100 micrograms (4,000 IU) of vitamin D a day, as it could be harmful. Children aged 1 to 10 should not have more than 50 micrograms (2,000 IU) a day.

Who are the high-strength 10,000, 20,000 and 50,000 IU capsules for?

These are for people a doctor or pharmacist has advised to take a higher dose, for example to correct a deficiency. They are not for everyday use without that advice. For daily maintenance, our 1,000 IU (25 mcg) capsules are the standard option.

Why is vitamin K2 combined with vitamin D3?

Vitamin D3 and vitamin K2 are often paired because of how they work together in calcium metabolism. If you take blood-thinning medication such as warfarin, speak to your GP or pharmacist before taking vitamin K.