The World’s First Open-Source Supplement Company

Most companies use "proprietary blends" so they don't have to tell you the amount of each ingredient in their formulas. At Natural Stacks we believe it's your right to know exactly what you're putting into your body. We proudly publish our innovative formulas and ingredient suppliers in an open source format. 

LEARN ABOUT OUR COMMITMENT TO TRANSPARENCY

Vitamin D3 plays an integral role in regulating the neuromuscular and immune systems, as well as mood and sleep. It’s also a critical hormone precursor that supports new cell growth and bone formation.

Natural Stacks Vitamin D3 features:

  • 5,000 IU of Vitamin D3
  • 100 mg of Organic Coconut Oil
  • Highly bioavailable

02/ Ingredients

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100% Happiness Guarantee

If for whatever reason you're unsatisfied with your Natural Stacks supplements, you can keep the full bottle on us and we'll refund your money. Anything after the first bottle, we'll ask that you return for a refund.

average rating 5.0 out of 5
Based on 76 reviews
  • 5 Stars
    73 Reviews
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100% of reviewers would recommend this product to a friend
76 Reviews
Rated 5 out of 5
Review posted

Smart for Shift Workers

I am a new paramedic with low seniority, so I have been working 12 hour night shifts for the past year now. Shift work has definitely made me question my vitamin D levels and I know for a fact my mood has been more volatile. Been taking the Vitamin D supplement for a couple weeks now and notice a stabilization in mood. Took a blood test last week and my Vitamin D levels were at 59 ng/mL. Which is right in the middle of normal values. Unfortunately, I don't have a value for before I started supplementing. I do, however, have a history of having lower levels in the past and with working night shift, I can only imagine what they were at prior to me supplementing.

As far as immune system improvement, I typically get a cold more often than most people. About 3-5 times a year. Felt like I was coming down with a cold again a few days back and was preparing for the week of misery. Went to sleep and woke up feeling normal. Not sure it was the supplement or not that help kick whatever was trying get me sick but I'm sure it help somewhat.

Definitely will keep supplementing with product for as long as I'm on nights.

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Rated 5 out of 5
Review posted

Natural Stacks Vitamins are pure and Great quality.

I love being able to rest assured that the quality of the products provided by this company are standardized to a level befitting people who care about their health and what they put into their bodies. Bravo Natural Stacks.

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Rated 5 out of 5
Review posted

I love everything from this company!

I have tried Natural Stacks dopamine, serotonin, vitamin D, vitamin C, and both CBD products. I have been very happy with the results of each and every product.

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Rated 4 out of 5
Review posted

Vitamin D3-coconut oil

I like the product.what does it help with when taking.

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Rated 5 out of 5
Review posted

The best

I have many different Vitamin D brands, this one is definitely the best.

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