Delivering to United Kingdom
The best vitamin D supplements
Vitamin D supports immunity and bone health, and most of us fall short in winter. Here is how to choose, and our pharmacist picks.
In short
For most adults, a daily 10 microgram (400 IU) vitamin D3 supplement is ideal through autumn and winter. D3 is better absorbed than D2; capsules, tablets and sprays all work.
Our picks
- Best overallVitamin D3 1000 IU
A simple, well-absorbed daily dose that covers the winter shortfall for most adults.
View product → - Best for immunity comboOmega-3 Fish Oil
Pairs well with vitamin D for winter wellbeing, supporting heart and brain too.
View product →
How we chose
Our pharmacy team weighs the evidence, not the hype.
- 1
Right form
We favour vitamin D3 (cholecalciferol), which raises blood levels more effectively than D2.
- 2
Sensible dose
10 micrograms (400 IU) daily suits most adults; higher only if advised by a clinician.
- 3
Quality & value
Clear labelling, reputable manufacturing and a fair price per daily dose.
Frequently asked
D3 or D2, which is better?
Vitamin D3 (cholecalciferol) is generally more effective at raising and maintaining blood levels than D2, so it is the usual first choice.
Can I take too much vitamin D?
Yes. Stick to the amount on the label. Very high doses over time can be harmful, so only exceed standard amounts on a clinician's advice.