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 USA. 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 Identify that the supplement has been manufactured in the US to the highest standards using only the best vegan ingredients.
High-Quality We always recommend buying from local companies. Large and international brands sometimes make their products abroad, which could result in toxic ingredients or harmful side effects.
Money-Back Guarantee Companies that stand by their product with a 60 day money back guarantee tend to have higher quality products. They also give you sufficient time to see results or return 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 US 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.

1. Vitamin D3 + K2 Complex ^{[ 1 ]}

by Bettervits

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
60 Possible Servings
Made in USA w/ US & Global Ingredients
Vegan Friendly
60 Day Money Back Guarantee

Cons

Only Available Online Only Available Online
Sometimes Out of Stock

The Bottom Line

Of all the Vitamin D supplements we reviewed Bettervits D3 + K2 was the strongest contender, coming in with both good value for money and a strong quality formula.

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, due to the strong serving size dose of 4,000 IU, it is possible to only take 1 capsule for most daily needs, as each capsule provides 2,000IU which is a sufficient dose for many. This makes it better value for money over other products which have 2,000IU per serving only.

The combination of high dose D3 + K2 vitamins helps boost immunity, strengthens bones & muscles and elevates your mood and energy levels. It may even help lower the chances of Type 2 diabetes.

Lastly, Bettervits Vitamin D3 + K2 is made in the USA with the highest standard vegan ingredients and quality control due to it being manufactured by GMP 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.

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2. Vitamin D3

by JSHealth