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Vitabiotics Ultra Vitamin D3 1000IU, 96 tablets vs Vitabiotics Ultra Vitamin D3 400IU, 96 tablets vs Natures Aid Mini Drops Vitamin D3, 50ml vs Vegan Vitamin D3 1000iu, 180 tablets. Rows marked in yellow are where these products differ on what we have recorded.
Where they differ
- Price now
- Look Into awards
 Vitabiotics Ultra Vitamin D3 1000IU, 96 tablets |  Vitabiotics Ultra Vitamin D3 400IU, 96 tablets |  Natures Aid Mini Drops Vitamin D3, 50ml |  Vegan Vitamin D3 1000iu, 180 tablets | |
|---|---|---|---|---|
| Price now | £2.14 | £3.00 | £3.72 | £7.99 |
| Look Into awards | Best for what Britain is actually buying | LookInto Winner | Best for babies and under fives | Best for vegans |
| Why it was picked | 1,000 IU is 25 micrograms, a quarter of the NHS ceiling, and it is the strength most British shelves default to. You are paying 4.3p a day. (Best vitamin D supplements) | This is the one that matches the advice, and it is also the cheapest thing on the list. 400 IU is 10 micrograms, which is exactly what the NHS tells adults and children over one to take through autumn and winter. It is a small tablet, it is a UK brand with the review depth to match, and there is nothing else in it to think about. (Best vitamin D supplements) | The label states 400 IU per dose, which is the 10 micrograms the NHS asks for in children aged 1 to 4 all year round, and within the 8.5 to 10 micrograms it names for babies up to one. (Best vitamin D supplements) | Most vitamin D3 on the shelf is cholecalciferol made from lanolin, which comes off sheep's wool, so an ordinary D3 tablet is usually not vegan even when nothing on the front of the box mentions animals. (Best vitamin D supplements) |
| Category | Health & Wellness | Health & Wellness | Health & Wellness | Health & Wellness |
| Read the research | Best vitamin D supplements checked 28 Sep 2026 | Best vitamin D supplements checked 28 Sep 2026 | Best vitamin D supplements checked 28 Sep 2026 | Best vitamin D supplements checked 28 Sep 2026 |
| Where to buy | View on Amazon Full record | View on Amazon Full record | View on Amazon Full record | View on Amazon Full record |
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Look Into researches products from published sources: makers’ pages, retailer listings and regulators. We have not handled or tested these products, and a blank field means we have not recorded that figure yet, not that the product lacks the feature. Awards are Look Into editorial picks, not Amazon or third-party awards. As an Amazon Associate, Look Into earns from qualifying purchases; commission never decides a ranking. How we check · How we make money