Our Top 5 Vitamin D Supplements in 2025

Find out which supplements actually work and which to stay away from

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Why Take a Vitamin D Supplement?

Vitamin D is essential for many functions, more specifically for healthy bones, teeth, muscles and immune system. This is because Vitamin D works to increase our absorption of calcium, magnesium and phosphate.

Getting enough Vitamin D from our diet, particularly Vitamin D3, is notoriously difficult. The Vitamin D that we get from foods, supplements and the sun isn’t immediately available in the state that our bodies need.

Even if we are getting enough Vitamin D, our body may also need assistance converting this into a state that our body can use. Vitamin K2 enables this process.

Our main source of Vitamin D is from sunlight, which causes difficulties for most of the US population to absorb the amount required.

Why Specifically Vitamin D3 & K2?

Vitamin D3 is the most bioavailable form of Vitamin D that our body can absorb, meaning that it is also our primary source of Vitamin D. Given that we cannot get enough from the available sunlight, we should take Vitamin D3 as a supplement.

Vitamin D3 and K2 work hand in hand for optimal calcium absorption and benefits. Firstly, Vitamin K2 prevents any inadvertent toxicity that can occur by taking too much Vitamin D.

Secondly, K2 actually aids the processes that D3 are involved in – it ensures that the calcium that the Vitamin D makes available actually ends up in the right places.

There’s another important element to the D3 + K2 teamwork. We know that Vitamin D is essential for immune health. Research has now shown that Vitamin K2 has a part to play here too. Put them together and the benefits for immune function are quite remarkable.

Benefits of High Quality Vitamin D3 Complex

Vitamin D is recommended for almost all adults in the UK. It is a vital vitamin to take and it comes with extensive benefits such as:

  • Supports Immune System

  • Improves Mood & Wellbeing

  • Supports Joint, Bone & Muscles

  • Supports Blood Pressure Levels

What To Look For?

Not all supplements are equal. It's important to only choose supplements that fit the following, or you may not experience an improvement and could lose your money.

  • Scientifically-Proven Formula Look at the formula, and that it contains Vitamin D3 and Vitamin K2 MK-7, to ensure the highest quality and bioavailable compounds.
  • High-Strength Look at the labelling to see how much Vitamin D3 and K2 are present in the supplement. You need to identify a high-dosage of Vitamin D3 up to 4000iu and 100ug of K2.
  • High-Quality Identify that the supplement has been manufactured in the UK to the highest standards using only the best vegan ingredients.
  • Money-Back Guarantee Make sure you choose a supplement that has a straightforward money-back guarantee, should you not be satisfied with the product.

What Should I Avoid?

  • Poor Formulations & Doses Discard products which are only labelled as Vitamin D, or D2, without the benefits of D3 and K2.
  • Subpar Ingredients Avoid supplements which are not manufactured in the UK or which use animal products.
  • Low Potency Take notice of the strength as you want to take a high dose. Many supplements contain very low levels.
  • Artificial Reviews Watch out for product listings on Amazon and other marketplaces. In many cases, these reviews are fake and only made to increase their visibility. Buy from brands that have trusted-looking websites and produce their supplements locally.

A+

OVERALL GRADE

TOTAL RANKING

  • Ingredient Safety
    9.9AVG. 9.9/10
  • Projected Efectiveness
    9.8AVG. 9.8/10
  • Value
    9.7AVG. 9.7/10
  • Return Policy
    9.5AVG. 9.5/10
  • Customer Satisfaction
    9.6AVG. 9.6/10

Pros

  • 4000IU High Dosage of Vitamin D3
  • Contains Vital K2 Vitamin
  • Good Value For Money
  • Only 1 Capsule Per Day Needed
  • Manufactured in the UK
  • Vegan Friendly
  • 60 Day Money Back Guarantee
  • Recommended by Healthcare Professionals

Cons

  • Only Available Online Only Available Online
  • Sometimes Out of Stock

The Bottom Line

Of every Vitamin D supplement we tested Bettervits D3 + K2 is by far the highest quality Vitamin D supplement.

Unlike many other brands, Bettervits includes Vitamin K2 to prevent toxicity which could be caused from too much Vitamin D. It also aids in boosting calcium absorption.

Additionally, you only need to take 1 capsule a day due to the very high dosage of Vitamin D3. This makes it better value for money over other products which have 2 capsule servings.

The combination of high dose D3 + K2 vitamins helps boost immunity, strenghtens bones & muscles and elevates your mood and energy levels. It could even help prevent Type 2 Diabetes.

Lastly, Bettervits Vitamin D3 + K2 is made in the UK with the highest standard vegan ingredients and quality control as per European & UK Standards.

Most importantly, Bettervits comes with a Money Back Guarantee of 60 Days, so readers can try it risk free.

* Results and rankings are based on subjective opinion and do not necessarily reflect typical results from the use of these products. Please visit product website for more information.
We found one coupon code for this product: PRO10 for 10% off

2. Vit D3/ Vit K2

by Natures Plus

B+

OVERALL GRADE

TOTAL RANKING

  • Ingredient Safety
    9.2AVG. 9.2/10
  • Projected Efectiveness
    9.0AVG. 9.0/10
  • Value
    9.1AVG. 9.1/10
  • Return Policy
    9.5AVG. 9.5/10
  • Customer Satisfaction
    8.8AVG. 8.8/10

Pros

  • Contains Vitamin D3 and Vitmamin K2
  • No artificial colours and preservatives

Cons

  • Large capsule - can be difficult to digest
  • Manufactured outside of the UK

The Bottom Line

This D3 & K2 combo supplement by Natures Plus contains the right ingredients to prevent toxicity of too large doses of Vitamin D3. However, despite the inclusion of K2, it still contains a rather low potency of Vitamin D. This could impact effectiveness.

In addition, it is in quite a large capsule and is not manufactured locally, which means it is a difficult pill to swallow.

* Results and rankings are based on subjective opinion and do not necessarily reflect typical results from the use of these products. Please visit product website for more information.
We found one coupon code for this product: PRO10 for 10% off

3. D3 1,000 IU

by Bio Innovations

C

OVERALL GRADE

TOTAL RANKING

  • Ingredient Safety
    8.7AVG. 8.7/10
  • Projected Efectiveness
    89AVG. 8.9/10
  • Value
    9.0AVG. 9.0/10
  • Return Policy
    8.2AVG. 8.2/10
  • Customer Satisfaction
    8.6AVG. 8.6/10

Pros

  • Vegan Friendly
  • Manufactured under GMP standards
  • Can be dissolved

Cons

  • Does not contain Vitamin K2 MK-7
  • Manufactured Outside of UK
  • No Money Back Guarantee
  • Low Dosage of Vitamin D

The Bottom Line

This D3 supplement by Bio innovations is vegan friendly and contains a low dose of Vitamin D.

However, it falls short due to the fact that it is not made locally in the UK, and therefore it's ingredients can not be fully traced. Furthermore, this means it is not as regulated as the other products on this list.

Due to the lack of Vitamin K2, the level of potency of the D3 ingredient is extremely low. Therefore it is generally recommended to find a supplement that does contain K2.

* Results and rankings are based on subjective opinion and do not necessarily reflect typical results from the use of these products. Please visit product website for more information.
We found one coupon code for this product: PRO10 for 10% off

4. Vitamin D3 2000iu

by Troo Healthcare

D

OVERALL GRADE

TOTAL RANKING

  • Ingredient Safety
    8.5AVG. 8.5/10
  • Projected Efectiveness
    8.0AVG. 8.0/10
  • Value
    8.1AVG. 8.1/10
  • Return Policy
    8.0AVG. 8.0/10
  • Customer Satisfaction
    8.4AVG. 8.4/10

Pros

  • Manufactured in the UK
  • Vegan Friendly

Cons

  • Does not contain Vitamin K2
  • Low Dosage of Vitamin D
  • No Money Back Guarantee
  • Requires 2 Capsules Per Day

The Bottom Line

Troo Healthcare's Vitamin D supplement comes in at second place, primarily due to the local manufacturing and therefore abidance of local regulations. Furthermore, their supplement is vegan friendly.

However, it falls short in terms of potency, as it has a lower dose than Bettervits. This makes it less effective and also means it requires a daily serving of 2 capsules, which makes it less value for money.

Perhaps most importantly, it does not contain Vitamin K2 which prevents toxicity from too high doses.

* Results and rankings are based on subjective opinion and do not necessarily reflect typical results from the use of these products. Please visit product website for more information.
We found one coupon code for this product: PRO10 for 10% off

5. Chewable Vitamin D-3

by Now

D-

OVERALL GRADE

TOTAL RANKING

  • Ingredient Safety
    8.5AVG. 8.5/10
  • Projected Efectiveness
    7.6AVG. 7.6/10
  • Value
    7.3AVG. 7.3/10
  • Return Policy
    8.1AVG. 8.1/10
  • Customer Satisfaction
    8.2AVG. 8.2/10

Pros

  • Chewable Form
  • Contains Natural Fruit Flavors

Cons

  • Low Dosage of Vitamin D3
  • Does not Contain Vitamin K-2
  • Not Vegan Friendly

The Bottom Line

These chewable Vitamin D3 supplements are great if you have difficulty swallowing pills.

However, due to it's intake method, it contains a much lower dose of Vitamin D than the rest of the products in this list. In addition, it does not contain K2 and is not vegan friendly, therefore it is only recommended for readers who are physically unable to swallow pills. *

* Results and rankings are based on subjective opinion and do not necessarily reflect typical results from the use of these products. Please visit product website for more information.
We found one coupon code for this product: PRO10 for 10% off

2025's Top Vitamin D3 Supplement

Overall, BetterVit's Vitamin D3 & K2 Supplement is far superior to most other products on the market today. With a science-backed formula, trusted reputation and high quality ingredients, their product is the most effective and with proven results. Best of all, they offer a moneyback guarantee and free shipping, so customers have peace of mind and no risk. 60 Day Return Policy

MADE
IN THE UK

FREE
SHIPPING

MONEY-BACK
Guarantee

Disclosure

We strive to ensure that comparisons are made on the basis of factual information such as ingredients, quantity of ingredients, real customer testimonials, manufacturing location, return policies and other pertinent information to evaluate a product.

The information contained within this site is not intended as a substitute for professional medical advice. If you have, expect to have, or suspect you may have any medical condition, you are urged to consult with a health care provider. These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any diseases or medical conditions.

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