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Bare Biology Vitamin D test kit with colourful illustration on packaging of lady with blue wavy hair.
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.

Vitamin D Test Kit

£50.00

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

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: 17/12/2026

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.

Vitamin D Test Kit

£50.00

Why Testing is Important

  • 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.

  • 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.

  • Know your ideal dosage

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

  • 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
4.1
Rated 4.1 out of 5 stars
Based on 18 reviews
18 reviews
  • Tri D. M. P.
    Verified Buyer
    How old are you? 25-34
    What is your gender? Male
    Why do you take Bare Biology supplements? General wellbeing, Skin health, Immunity support, Heart health, Mental health
    Yesterday
    How old are you? 25-34
    What is your gender? Male
    Why do you take Bare Biology supplements? General wellbeing, Skin health, Immunity support, Heart health, Mental health
    Rated 1 out of 5 stars
    Extremely hard - Don't do it at home

    As far as I love BB products so much that I ordered 2 test kits (one for me, one for my partner) without checking the reviews. If I checked it, I wouldn't have spent nearly 100 quids for 2 of these.

    It's an EXTREMELY PAINFUL process to go through, and yes 3 lancets were not enough and I can't bear more. My 3 fingers hurting the whole day, the blood came out not enough and dried off quickly on my fingers which I need to touch the card. I followed through carefully their instructions including the warm up.

    Now I give some benefit of doubts that: (1) my blood could be so thick or something wrong with me that the blood didn't drop out properly/easily, (2) I didn't press the lancet hard enough (I wouldn't want to press it harder!).

    I wouldn't be able to do it myself, the mechanisim is too bad. I did use some home blood test in the past and they used an easy click button not pressing like this. I needed to ask my partner to do it for me and after experiencing my trauma, she decided not to do the test herself which the test kit is lying there for nothing.

    My advise is: if you are scared like me, better to go to the clinic and get it done professionally rather than at home and waste your money. And this test kit is from BB's partner, not BB directly.

    BB Profile picture for Bare Biology
    Bare Biology
    Yesterday

    Hello Tri,

    We're so sorry to hear about your experience with our vitamin D test kit.

    We completely understand how frustrating this must have been. This certainly isn't the experience we'd want you to have.

    I've just reached out to you directly via email to see how we can help. In the meantime, please know that you can always contact our friendly customer service team at info@barebiology.com if you ever have any issues with our products. We're always happy to help.

    Best wishes,

    Charlie

  • Lee O.
    Verified Buyer
    How old are you? 35-44
    What is your gender? Male
    Why do you take Bare Biology supplements? General wellbeing
    1 year ago
    How old are you? 35-44
    What is your gender? Male
    Why do you take Bare Biology supplements? General wellbeing
    Rated 5 out of 5 stars
    Vitamin D test kit

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

  • Janine S.
    Verified Buyer
    How old are you? 45-54
    What is your gender? Female
    Why do you take Bare Biology supplements? General wellbeing
    2 years ago
    How old are you? 45-54
    What is your gender? Female
    Why do you take Bare Biology supplements? General wellbeing
    Rated 4 out of 5 stars
    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.

  • Natasha S.
    Verified Buyer
    How old are you? 45-54
    What is your gender? Female
    Why do you take Bare Biology supplements? General wellbeing , Joint health , Immunity support , Heart health , Skin health
    2 years ago
    How old are you? 45-54
    What is your gender? Female
    Why do you take Bare Biology supplements? General wellbeing , Joint health , Immunity support , Heart health , Skin health
    Rated 3 out of 5 stars
    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.

    BB Profile picture for Bare Biology
    Bare Biology
    2 years ago

    Thank you for sharing your feedback, Natasha. We're sorry to hear about the troublesome lancets in your testing kit. We are always here to offer support and can send more lancets or sample cards if you need them.

    We're glad you managed to complete the test though. The results include recommendations on how to increase your vitamin D levels from both food sources and supplemental doses.
    If you're still unsure on what's best for you, you can always message the lab or our customer service team for further help. Just email us at info@barebiology.com.

    We're here to help! 😊

  • Aysha T.
    Verified Buyer
    How old are you? 35-44
    What is your gender? Female
    Why do you take Bare Biology supplements? General wellbeing
    2 years ago
    How old are you? 35-44
    What is your gender? Female
    Why do you take Bare Biology supplements? General wellbeing
    Rated 4 out of 5 stars
    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

  • Fiona M.
    Verified Reviewer
    How old are you? 45-54
    What is your gender? Female
    Why do you take Bare Biology supplements? General wellbeing
    2 years ago
    How old are you? 45-54
    What is your gender? Female
    Why do you take Bare Biology supplements? General wellbeing
    Rated 1 out of 5 stars
    Difficult to do

    I followed all the directions but found the test really difficult to do. I just couldn’t get enough blood, even though I used all the lancets. Wouldn’t use again. Will need to go to GP to do a proper test.

    BB Profile picture for Bare Biology
    Bare Biology
    2 years ago

    Hi Fiona

    Thank you for your review, and I'm so sorry to hear you are having trouble with your test.

    I've popped you an email directly. If you need extra lancets or a new sample paper, we can easily send them to you right away.

    You can contact us at any time via info@barebiology.com, and we're always ready to help with product problems or questions.

    I hope this helps.

    Georgia

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