Your free fortnightly recommendation – it's on us
Drawing on nearly half a decade at Which?, Natalie helps readers cut through the noise with practical guidance on trending products, pest control, cleaning advice and money-saving tips during the sales.
Every fortnight, Which? free account owners are given an exclusive glimpse behind the curtain at some of our members-only product reviews.
This week, we're putting two vitamin D supplements under the spotlight. One is a ray of sunshine with great absorption, plenty of doses and a wallet-friendly price, while the other leaves a lot to be desired.
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At a glance: Nutravita Vitamin D3 Drops vs Vitabiotics Ultra Vitamin D Gummies
| Best Buy & Great Value: Nutravita Vitamin D3 Drops | Vitabiotics Ultra Vitamin D Gummies | |
|---|---|---|
| Which? test score | 99% | 58% |
| Where to buy | SQUIRREL_TEXT_50030011 | SQUIRREL_TEXT_50030114 |
| Cost per daily dose* | 2p** | 24p |
| Bioavailability | ||
| Dose | ||
| Additives |
Date tested: September 2025. Which? test score combines scores for each attribute tested, weighted according to overall importance.
Bioavailability: how easily the vitamin D in the supplement is absorbed by the body. Dose: whether vitamin D is included in an appropriate dose – not too low or too high. Additives: whether the product contains lots of bulking and filling agents or additives, and what types are used.
* Daily dose cost based on manufacturer's recommended dose and cheapest price per pack at time of original publication. As pack pricing is dynamic, this is indicative only and may not be correct if prices change.
** The manufacturer says this bottle contains 2,000 doses, based on a dose of one drop a day, meaning it would last more than five years. However, the shelf life is up to two years, so we've based the cost per daily dose on that. If you're sharing the bottle, it will go further. We're not able to show every retailer, and cheaper prices may be available.
Best Buy/Great Value: Nutravita Vitamin D3 Drops
We like: Excellent bioavailability
Watch out for: Dropper can be slightly fiddly to use
This simple – yet highly effective – liquid supplement combines vitamin D3 with coconut oil, which helps its absorption. The convenient liquid drop format is ideal if you’d rather avoid swallowing tablets or capsules.
Plus, the quantity is seriously impressive, with around 2,000 doses per bottle. In theory, one bottle could last for more than five years, although the two-year shelf life means you’re unlikely to use every last drop.
With a good dosage, an effective format and no unnecessary extras, it gives you exactly what you need without the fuss. Better still, it has a low enough price to earn our Great Value recommendation, too.
For Which? members only: see our full Nutravita Vitamin D3 Drops review
Vitabiotics Ultra Vitamin D Gummies
We like: Some may prefer taking gummies to tablets
Watch out for: High cost per dose
Like other gummies, these contain lots of additives, including glucose syrup, sugar and flavourings. They're also pricey compared with alternatives.
For Which? members only: see our full Vitabiotics Ultra Vitamin D Gummies review
Our expert says
Shefalee Loth, Which? principal researcher and nutritionist
'Getting enough vitamin D isn’t always as simple as eating the right foods, particularly during the darker months when our bodies make less of it from sunlight.
'We've tested a range of popular supplements, from tablets and gummies to sprays and drops, to see which ones make getting your daily vitamin D as easy and effective as possible.
'Our independent tests looked at whether they provided a sensible dose, how readily the vitamin D could be absorbed and whether they contained unnecessary extras. Our Best Buys stood out for getting the important things right – and we also highlighted Great Value options that offer a good dose without the hefty price.'
All your health questions answered
- Best multivitamin supplements – get the most from your daily supplements with help from our testing.
- The UK's most common vitamin deficiencies and how to fix them – discover how some simple diet changes can help ensure you get the vitamins you need.
- The healthier butters and spreads – we analysed more than 50 popular spreads to determine the best for your nutrition.
- High-fibre foods: cheap and easy ways to boost your diet – fibre is essential in your diet, and we tell you how to get more of it easily.
We have your back when things go wrong
- Faulty product? How to get a refund, repair or replacement
- Make a delivery complaint
- Spot scams and protect yourself from them
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