Vitamin D3 Capsules, 90 capsules
£16.99 for 90 capsules at Bio-Synergy. That works out at 4p per 1,000 IU, which ranks it 46th of the 207 vitamin D3 products we price across 20 UK retailers.
At one 1,000 IU dose a day, this pack lasts 1.2 years. A month is 30 days, so twelve of them is not quite a year.
How we worked it out
- Servings: 90 ÷ 1 per serving = 90
- In the pack: 90 × 5,000 IU = 450,000 IU
- £16.99 ÷ 450,000 IU × 1,000 IU = 3.78p per 1,000 IU
- A week 3.78p × 7 = 26p · a month × 30 = £1.13 · a year × 365 = £13.78
- 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 →
Switching to the Vitabiotics pack saves 20p 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
- 5,000 IU per serving (stated on the label)
- Pack
- 90 capsules · 90 servings · 1 capsule(s) a serving
- Cost per serving
- 19p (90 servings in the pack)
More label details
- Barcode
- 5034839008208
- Sold by
- Bio-Synergy
- What the listing says
- “Specifications: 90 caps” · “Provides 5000iu (125mcg) of Vitamin D3 per capsule”
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One 1,000 IU dose is our comparison unit, not a recommendation.
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Filled in from the label’s serving: 1 capsule.
What you paid
Optional. At Bio-Synergy today: £16.99.
“Order by” allows 5 working days’ delivery from Bio-Synergy and your spare days.
Price history
No price change since 21 September 2026. Checked on 29 days, most recently 20 October 2026.
- Price at every check
- £16.99Bio-Synergy
- First recorded
- £16.9921 Sept
- Checked on
- 29 dayssince 21 Sept
- First checked at Bio-Synergy: £16.99
Questions about this product
How much does Bio-Synergy Vitamin D3 Capsules cost per 1,000 IU?
4p per 1,000 IU, from £16.99 for 90 capsules at Bio-Synergy, checked on 20 October 2026.
Is it the cheapest vitamin D3 in the UK?
No, it is 46th of 207. High-Strength Vitamin D3 Tablets at WeightWorld works out at 1p per 1,000 IU.
How long does one pack last?
1.2 years at one 1,000 IU dose. The pack holds 450,000 IU in total.
About Bio-Synergy
Founded 1997 · London, England
Bio-Synergy is a sports nutrition company founded in 1997 by Daniel Herman, who remains a director. It is based on Finchley Road in London and says its products are made in the UK.
All 29 Bio-Synergy products, priced per doseVisit Bio-Synergy (opens in a new tab)
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