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High-Strength Vitamin D3 Tablets

£8.99 for 400 servings at WeightWorld. That works out at 1p per 1,000 IU, which ranks it 1st of the 207 vitamin D3 products we price across 20 UK retailers.

What it really costs, per 1,000 IU1pOne 1,000 IU dose is our comparison unit for vitamin D3. It is not a recommendation.
A day1p
A week4p
A month17p
A year£2.05

At one 1,000 IU dose a day, this pack lasts 4.4 years. A month is 30 days, so twelve of them is not quite a year.

How we worked it out

  • In the pack: 400 × 4,000 IU = 1,600,000 IU
  • £8.99 ÷ 1,600,000 IU × 1,000 IU = 0.562p per 1,000 IU
  • A week 0.562p × 7 = 4p · a month × 30 = 17p · a year × 365 = £2.05
  • Amount per serving: stated on the label.

The standard dose is a comparison unit, not a recommendation. Always confirm the price on the retailer's site. How we compare everything.

How it compares: vitamin D3

All 207, ranked →
WeightWorldThis productCheapest per 1,000 IUWeightWorld · 4,000 IU a serving · 17p a month · a pack lasts 4.4 years1pshown above
ZipVitVitamin D3 4000iuZipVit · 4,000 IU a serving · 17p a month · a pack lasts 4 years1p£8.49View at ZipVit (opens in a new tab)

Ranked purely by price per 1,000 IU. 439 combination products also contain vitamin D3.

On the label

Vitamin D3 · Vitamin D3
4,000 IU per serving (stated on the label)
Pack
400 servings · 1 tablet(s) a serving
Cost per serving
2p (400 servings in the pack)
More label details
Sold by
WeightWorld
What the listing says
“Servings per Container: 400” · “Take 1 tablet daily” · “Vitamin D3 (Source : Lanolin) ; 4000 IU”
Ingredients

Dicalcium Phosphate., Microcrystalline Cellulose, Silicon Dioxide Advice Do not exceed the recommended daily dose. Food supplements must not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Discontinue use and consult a doctor if any adverse reactions occur. Not intended for use by persons under the age of 18.

From the WeightWorld listing. Check the pack itself if you have an allergy: labels mark allergens in bold.

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One 1,000 IU dose is our comparison unit, not a recommendation.

Price history

No price change since 9 October 2026. Checked on 1 day, most recently 9 October 2026.

Price at every check
£8.99WeightWorld
First recorded
£8.999 Oct
Checked on
1 daysince 9 Oct

Checked once so far, on 9 October 2026.

  1. First checked at WeightWorld: £8.99

Questions about this product

How much does WeightWorld High-Strength Vitamin D3 Tablets cost per 1,000 IU?

1p per 1,000 IU, from £8.99 for 400 servings at WeightWorld, checked on 9 October 2026.

Is it the cheapest vitamin D3 in the UK?

Yes. Of the 207 we price across 20 UK retailers, this is the cheapest per 1,000 IU.

How long does one pack last?

4.4 years at one 1,000 IU dose. The pack holds 1,600,000 IU in total.

About WeightWorld

All 124 WeightWorld products, priced per dose

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