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The Bare Biology Vitamin D Test Kit box features a minimalistic design with abstract blue waves. A hand holding a clenched fist symbolizes the fight against deficiency, set against a white background.
a woman sitting at table, using her laptop and holding a bare biology vitamin D test kit. No More Guessing is written in the bottom corner.
Illustration of a lady with blue hair doing a standing yoga pose and the Bare Biology difference checklist next to her: just a few drops of blood, do it at home, quick results.
The white Bare Biology Vitamin D Test Kit package features a blue abstract wave and fish design, providing a modern, minimalist way to identify vitamin D deficiency for health-conscious individuals.
 
Test Kit

Vitamin D Test Kit

£50.00
off

Unusual to find a useful prick, but here it is. A few tiny drops of blood tell you how much vitamin D you actually need. About 1 in 6 UK adults is thought to be deficient in vitamin D but it’s best to check, as too much (though rare) can be pretty bad.

Laboratory tested for accuracy

Includes D3 and D2 breakdown

Follow up dosage recommendations

Quantity
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What you need to know

It’s estimated 1 in 6 UK adults has low vitamin D* and supplementation is our only source from October to March. But if you’d like to know where you are, the only way is to take a test and good luck getting a doctor appointment these days. Best DIY it.

What’s Included

The kit includes:

✔️ Dried blood collection device

✔️ Lancets

✔️ Plasters

✔️ Prepaid return box

✔️ Instructions

Who Should Test

Everyone would benefit from knowing their vitamin D levels, even if it’s just to check the supplements are doing their job. There are some groups of people who would particularly benefit:People with limited exposure to sunlight (that’s all of us in the UK).

• People who don’t go outside much through choice or health limitations.

• Vegetarians and vegans as food sourced vitamin D3 is only found in animal products.

• Over 50s due to slower vitamin D metabolic processing and decreased calcium absorption.

• People with darker skin tones which need longer in the sun to get enough vitamin D.

• Alcohol drinkers and smokers.

• People with medical conditions and certain medications (see our vitamin D FAQs for more detail).

Instructions

Important: read carefully when you receive the kit otherwise the sample could fail and you would need to buy a new kit.

Do this first thing in the morning before you eat anything.

Activate your kit online following the instructions inside the test kit (you can do this anytime before taking the test).

Do the test, following the instructions carefully. Download our 'how to guide' and watch our 'how to video' on how to use the lancets correctly.

Package it up and put it in the postbox. It's all prepaid.

Receive emails throughout to track progress.

Login to your customer portal to get your PDF results.

Results can take up to 21 days from day of posting.

Current batch expiry: 18/6/2026

For more information visit the test kit FAQs, or speak with our customer services. They're ready to help via the live chat feature (bottom right of the page), or email info@barebiology.com anytime.

Example Test Results & How To Guide

Vitamin D Test Kit

£50.00

Why Testing is Important

1

Deficiency is common in the UK

We’re obsessed with the weather for good reason! We rarely see enough sun so around 75% of us are deficient.
2

The health benefits are enormous

Vitamin D has a huge impact on immune health and lots of new research shows it could be one of the most important nutrients.
3

Know your ideal dosage

Vitamin D toxicity (too much) is really harmful so it’s important to know your level if you’re supplementing.
4

Check you're absorbing Vitamin D

You may be taking a supplement but still have low levels. It could be genetics or it could be a health issue which you should check out.

woman holding bare biology beam and balance vitamin d3 and k2 spray bottle
woman holding bare biology beam and balance vitamin d3 and k2 spray bottle
4.2
Rated 4.2 out of 5 stars
Based on 17 reviews
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17 reviews
  • Rated 5 out of 5 stars
    2 months ago
    Vitamin D test kit

    Was easy to use and return. Results came within a week. Would recommend.

    Lee O.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    8 months ago
    Useful and convenient

    This kit is similar to the ones available elsewhere online that I have used before, but with the instructions presented slightly more clearly and the convenience of ordering from the same site as my supplements.

    I always find producing the blood spots difficult, so I deduct a star only because you are instructed to produce five spots, whereas I thought three or four is more usual and difficult enough.

    Thankfully there were plenty of lancets to have several attempts, but obviously I would have liked to succeed first time. I have now learnt by experience that for me it is pointless to try and extract blood from my left hand - possibly due to years of playing string instruments in the past having thickened the skin. Sticking rock music on the stereo and getting really pumped up also helps.

    The results arrived quicker than with other services I have used - within the week. I had hoped the result would prove that I didn't need to take a high dose, as my levels were boosted on prescription a seven years ago and I have been taking 1000 or 2000iu on and off ever since, but sadly this was not the case and my levels have gone back down.

    Janine S.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    9 months ago
    Great for those who can get blood out

    To be honest, I didn’t think we would get a result after taking the test. I bought it as a present for my mum and we made sure we followed all the instructions to the T. The kit came with 3 lancets (in case 1 was not enough). Even 3 weren’t enough! The lancet’s point is so fine that the hole made isn’t enough to make the blood come out. My mum is on a daily dose of Aspirin and even that didn’t help. We weren’t getting anywhere and in the end, we had to use a pin to take the test. Even then, it was really difficult to make sure that all 6 sections on the blood collection sample were filled with blood. You can’t just touch the card, the drop of blood has to easily drop off your finger on the particular area. I even think that 3 stars is way too generous.

    After receiving the result, I also don’t know what to do next and how to improve the level of Vit D as it’s been regularly taken for years but the test showed low levels of it.

    Natasha S.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    9 months ago
    Excellent fast experience

    Easy to do and the results came really quickly afterwards. Drawing the blood can be a bit tricky but other than that I am pleased with the kit and service. Very informative

    Aysha T.
    Verified Buyer
    Was this helpful?
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Viewing Slides 1 to 3 of 4
Lucy Laight Health, Vitamin D

The importance of vitamin D blood tests

Wondering if you're getting enough sunshine vitamin? Vitamin D blood tests are key to knowing your levels. Find out why getting tested is important for your well-being and how it...

Read more

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