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VitaminsVegan

Vitamin D3, 30 ml

£20.49 for 30 ml at Healf. That works out at 17p per 1,000 IU, which ranks it 141st of the 207 vitamin D3 products we price across 20 UK retailers.

What it really costs, per 1,000 IU17pOne 1,000 IU dose is our comparison unit for vitamin D3. It is not a recommendation.

A day17p

A week£1.20

A month£5.12

A year£62.32

At one 1,000 IU dose a day, this pack lasts 4 months. A month is 30 days, so twelve of them is not quite a year.

How we worked it out

Servings: 30 ÷ 1 per serving = 30
In the pack: 30 × 4,000 IU = 120,000 IU
£20.49 ÷ 120,000 IU × 1,000 IU = 17.1p per 1,000 IU
A week 17.1p × 7 = £1.20 · a month × 30 = £5.12 · a year × 365 = £62.32
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.

Cheaper vitamin D3

All 207, ranked →

Vitamin D3 2000 IUHealf · 2,000 IU a serving · £4.62 a month · a pack lasts 4 months15p£18.49View at Healf

Vitamin D3 4000iuHealf · 4,000 IU a serving · £4.68 a month · a pack lasts 4 months16p£18.70View at Healf

Calcium 1000mg & Vitamin D3 400iu TabletsSimply Supplements · 400 IU a serving · £4.70 a month · a pack lasts 2 months16p£11.29View at Simply Supplements

Vitamin D3 1,000 IUHealf · 1,000 IU a serving · £4.87 a month · a pack lasts 4 months16p£19.49View at Healf

Folic Acid 400 µg + Vitamin D 60 Tablets (2 month supply)Boots · 400 IU a serving · £5.00 a month · a pack lasts 24 days17p£4.00View at Boots

This productHealf · 4,000 IU a serving · £5.12 a month · a pack lasts 4 months17pshown above

Switching to the Healf pack saves 50p a month at the same 1,000 IU dose.

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: 30 ml · 30 servings · 1 ml a serving
Cost per serving: 68p (30 servings in the pack)

More label details

Claimed on the listing: vegan, vegetarian
Sold by: Healf
What the listing says: “30ml” · “Servings Per Container: About 30” · “One Dropperful (1mL)” · “(D3) (4,000 IU) ; 100 mcg”

Ingredients

Vitamin D (as Cholecalciferol) (D3) (4,000 lU), Medium Chain Triglyceride Oil, Antioxidant (Mixed Tocopherols)

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

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Daily doseIUFordays

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

Price history

No price change since 1 October 2026. Checked on 20 days, most recently 20 October 2026.

Price at every check: £20.49Healf
First recorded: £20.491 Oct
Checked on: 20 dayssince 1 Oct

Pack price at each check.

1 OctFirst checked at Healf: £20.49

Questions about this product

How much does Thorne Vitamin D3 cost per 1,000 IU?

17p per 1,000 IU, from £20.49 for 30 ml at Healf, checked on 20 October 2026.

Is it the cheapest vitamin D3 in the UK?

No, it is 141st of 207. High-Strength Vitamin D3 Tablets at WeightWorld works out at 1p per 1,000 IU.

How long does one pack last?

4 months at one 1,000 IU dose. The pack holds 120,000 IU in total.

About Thorne

All 123 Thorne products, priced per dose

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