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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

01/ THE SUNSHINE VITAMIN

Stay positive and keep your body healthy during those long indoor days or tough winter months with Vitamin D3 aka The Sunshine Vitamin.

Having healthy vitamin D3 levels is essential to optimal health and wellness. 

Our Vitamin D3 contains 5000IU in a coconut oil capsule.

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 79 reviews
  • 5 Stars
    76 Reviews
  • 4 Stars
    3 Reviews
  • 3 Stars
    0 Reviews
  • 2 Stars
    0 Reviews
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    0 Reviews
79 Reviews
Reviewed by Andrew C., from United States
Verified Buyer
I recommend this product
My Age
18 - 24
My Regular Dosage
1 Capsule
My Results
  • Improved Immune Function
  • Enhanced Well Being
Rated 5 out of 5
Review posted

Effective and cheap

Coconut oil is the prime combo with d3. Highly recommend

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Reviewed by Cheryl J., from United States
Verified Buyer
I recommend this product
My Age
55 - 64
My Regular Dosage
1 Capsule
My Results
  • Enhanced Well Being
  • Better Sleep
  • Improved Mood
  • Improved Immune Function
Rated 5 out of 5
Review posted

As advertised

As Advertised.

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Reviewed by Heidi Schlittler S., from United States
Verified Buyer
I recommend this product
My Age
45 - 54
My Regular Dosage
2 Capsules
My Results
  • Improved Immune Function
Rated 5 out of 5
Review posted

Need for immunity boost

During this time period and the illness going on I cannot be more satisfied with having more vitamins D helping bios immunity bone health and sunshine in a pill

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Reviewed by Ryan W., from United States
Verified Buyer
I recommend this product
My Age
18 - 24
My Regular Dosage
1 Capsule
My Results
  • Improved Mood
  • Enhanced Well Being
  • Improved Immune Function
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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Reviewed by Greta Nuernberger F., from United States
Verified Buyer
I recommend this product
My Age
55 - 64
My Regular Dosage
1 Capsule
My Results
  • Improved Immune Function
  • Enhanced Well Being
  • Better Sleep
  • Faster Recovery
  • Improved Mood
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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