Vitamin D Supplements
Vitamin D supplements made in the UK: vitamin D3 with K2, vegan D3 from lichen, and vitamin D drops dosed by the drop. Vitamin D contributes to the maintenance of normal bones and the normal function of the immune system.
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Choosing a vitamin D supplement
Vitamin D3 in the forms people actually ask for: capsules with K2, a vegan D3 from lichen, and oil drops you can dose precisely. Vitamin D contributes to the maintenance of normal bones and teeth, normal muscle function and the normal function of the immune system. UK guidance is that everyone considers a daily supplement from October to March.
The four products compared
| Product | Vitamin D per capsule or dose | Form | Chosen for |
|---|---|---|---|
| Vitamin D3 and K2 capsules | 2500 IU | Capsule with K2 | A higher daily dose with K2 alongside, for people whose result was low |
| Vegan vitamin D3 and K2 capsules | 2500 IU | Capsule, D3 from lichen | The same dose for vegans |
| Vitamin D drops | 1000 IU per dose | Oil drops | Flexible dosing, children and anyone who does not take capsules |
| Vitamin D3 and K2 oil drops | 1000 IU per dose | Oil drops with K2 | Drops with K2 alongside |
How to choose
UK guidance is 10 micrograms (400 IU) a day for most adults over winter, and the drops meet that comfortably. The 2500 IU capsules are for people whose blood result was low and who are raising it under guidance; the Nutri Tailor guide What vitamin D level needs supplementation? sets out the UK thresholds, and How long does vitamin D take to work? explains why a retest is worth waiting about twelve weeks for. Vitamin D is fat soluble, so take it with a meal that contains some fat.
All products are made in the UK to GMP standards and ship worldwide from the UK, with duties and taxes shown at checkout. If you take prescribed medicines, are pregnant or breastfeeding, or have a diagnosed condition, talk to your GP or pharmacist first. Not sure which fits? Ask Nutri365, the Nutri Tailor AI health expert.
Written by Nutri Tailor from the Health Reference Library. Last checked 6 September 2026. General information, not personal advice.