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Vitamin D Test Kit
Vitamin D Test Kit
Vitamin D Test Kit

Vitamin D Test Kit


Wondering how much vitamin D you need or if your supplement is working? Find out with this super easy and accurate finger prick test and receive tailored advice on dosage and nutrition.

Laboratory tested for accuracy

Includes D3 and D2 breakdown

Follow up dosage recommendations

Earn Flourish points with this purchase


It’s estimated 75% of the UK population has low vitamin D levels. Supplementation is our only source from October to March. It’s important to know your level so you take the right amount. Too much can be very bad for our health but we need enough for good health.

What’s Included

The kit includes:

Dried blood collection device



Prepaid return box


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 then!).

• 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 FAQs for more detail).


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 get your PDF results with personalised advice.

    Receive results normally around 10 days after receipt of the sample.

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Vitamin D Test Kit


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.  But taking enough is also key.


Are you absorbing Vitamin D?

You may be taking a supplement but still have low levels. This is an indicator of a health issue which is important to check out.  Genetics can also play a role in this.

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

For people & planet, by people

Founder of bare biology Melanie Lawson smiling in grey cardigan and gold necklace

100% UK family owned

We’re a small, founder-led business with no investors and zero association with big corporations. We run the business with our customers at its heart.

Omega 3 Supplement Company

Stellar customer service

You’re the most important part of our business and we’ll always look after you. You’ll never read a bad review about our customer service.

Sustainable, of course

From MSC certified marine collagen and sustainably sourced omega-3, to compostable and recyclable packaging. A UK & Norway based supply chain, we do business with care and consideration.

Rated 4.3 out of 5 stars
Based on 13 reviews
13 reviews
  • Fiona M.
    Verified Reviewer
    I do not recommend this product
    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
    3 days ago
    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 days 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, and we're always ready to help with product problems or questions.

    I hope this helps.


  • Caroline F.
    Verified Buyer
    I do not recommend this product
    Rated 1 out of 5 stars
    3 weeks ago
    Vitamin D Test Kit

    The kit had clear instructions and the report came through quickly. However I found it difficult to produce the bloods drops in the quantity needed. I suspect my result (0 nmol/l) was because I was not able to produce enough blood however the report didn't suggest this might be the case and was therefore not helpful at all.

    BB Profile picture for Bare Biology
    Bare Biology
    3 weeks ago

    Hi Caroline,

    We're glad the instructions were clear and the report came through quickly. But we're sorry you had a bit of trouble doing the test.

    If a test were to be unsuccessful you would be notified. So we've got in touch with the lab directly to see if they can shed anymore light on this for you. Once we've heard back we'll update you directly.

    Thank you for taking the time to leave us a review, and we hope to resolve this issue for you soon.

    Best wishes,

  • Shirley S.
    Verified Buyer
    I recommend this product
    How old are you? 55-64
    What is your gender? Female
    Why do you take Bare Biology supplements? Menopause support
    Rated 5 out of 5 stars
    1 month ago
    Vitamin D Test Kit

    Easy to use kit and guide to support you. Got the results quickly. Would definitely recommend.

  • Joanna K.
    Verified Buyer
    I recommend this product
    How old are you? 35-44
    What is your gender? Female
    Rated 5 out of 5 stars
    1 month ago
    Amazing service

    The test was delivery super quickly. Was easy to do and got the results back very fast. The report with the results was very comprehensive and helpful. Would highly recommend.

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