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Vitamin D

Not medical advice

This compares label amounts against published reference doses. It is information, not advice, and it is not personalised. Consult a healthcare professional before starting, stopping or combining supplements — particularly if you take prescription medication.
Side by side

Comparison

Product At full doseVitamin D3 per day BandCost per full dose Days supply
Vitamin D3 4000IU
WeightWorld
 1 of 1100 mcg Full dose£0.002 400 days
Every product

What's actually in them

Ingredient On the label Per day Reference Ratio Band
4000IU 100 mcgAt/over upper limit 10 mcg 10× Full dose
The daily amount meets or exceeds the published reference dose.
Reference dose
10 mcg (recommended daily allowance)
Source
SACN Vitamin D and Health report, July 2016— checked 5 Aug 2026
Upper limit
100 mcg
Evidence
Strong
Timing

Best taken with dietary fat

  • Vitamin D3 with Anti-seizure drugs
  • Vitamin D3 with Orlistat
Days supply
400 days
Cost per day
£0.025
Cost per full dose
£0.002
Price
£9.90
Amazon, 5 Aug 2026

Label captured 5 Aug 2026 (version 1).

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