• Gnarly Baseline D3 supplement in a brown bottle
  • Gnarly Baseline D3 supplement in a brown bottle description side
  • Gnarly Baseline D3 supplement in a brown bottle nutrition side
  • Gnarly Baseline D3 supplement in a brown bottle nutrition information
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Rated 5.0 out of 5
Based on 11 reviews

Baseline Vitamin D3

Baseline Vitamin D3

$12.95
$12.95
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The hormone-precursor most athletes are running low on — especially the ones logging miles in the dark months.

Immune System
Bone Health
Heart Health
Mood & well-being
Free shipping on orders over $75
30-day money-back guarantee
Trusted by 55,000+ athletes
NSF Certified

Benefits

Gnarly Vitamin D3 addresses one of the most widespread and underestimated nutritional deficiencies in active people — especially those who live and train in northern climates, spend significant time in low-light conditions, or simply don't get enough direct sun exposure year-round. Vitamin D3 is not just a bone health supplement — it's foundational to immune function, mood, hormonal balance, and athletic performance. Clean, vegan-friendly, NSF Content Certified.

  • Supports bone density, immune function, mood, and hormonal health
  • Especially critical for athletes in northern climates or with limited direct sun exposure
  • Vegan-friendly, clean-label capsule — no unnecessary fillers or additives

Function

Vitamin D is technically a hormone precursor, not just a vitamin — and it influences virtually every system in the body. Deficiency is remarkably common: an estimated 40%+ of Americans are vitamin D insufficient, with active populations in lower-sunlight climates running even higher risk.

For athletes, the stakes are higher. Vitamin D plays a direct role in muscle function, testosterone production, immune resilience, and bone mineral density — all of which are critical for sustained athletic performance and injury prevention. Research also links adequate vitamin D levels to improved mood and reduced risk of seasonal affective symptoms, relevant for athletes who spend months training in winter conditions.

Vitamin D3 (cholecalciferol) is the most bioavailable and effective form — the same form your skin synthesizes from sunlight exposure. Getting enough from sunlight alone is nearly impossible for most people who live above the 35th parallel or who train indoors during winter months. Supplementation is the practical, evidence-based solution.

How to Use

Take 1 capsule daily with a meal containing dietary fat — Vitamin D is fat-soluble and absorbs best when consumed with fat.

Stack: Part of the Gnarly Baseline daily wellness system. Pair with Gnarly Magnesium Glycinate (magnesium supports Vitamin D metabolism) and Gnarly Omega-3 for a complete foundational health stack.

Ingredients

Active Ingredients: Vitamin D3 as Vegan Cholecalciferol (1,000 IU)

Other Ingredients: Rice Bran, Vegetarian Capsule

Gnarly Effect

Vitamin D3 supplementation builds blood serum levels gradually over time. Most individuals see meaningful increases in serum 25(OH)D levels within 4–8 weeks of consistent daily supplementation.

Functional benefits — improved mood, immune support, reduced fatigue — are typically noticed within 4–6 weeks for individuals who were deficient at baseline.

Results vary significantly based on starting deficiency level, body weight, sun exposure, and individual absorption. Those starting with significant deficiency may notice more pronounced improvements. Periodic blood testing (every 3–6 months) is the most reliable way to confirm adequate levels.

Return Policy

If you’re not 100% satisfied, return your product within 30 days (less than half used) for a full refund, and we’ll also replace any items that arrive damaged. Exchanges are available, and return shipping may apply.
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FAQs View full details

Athlete Tested, Community Loved.

From mountain athletes to everyday grinders, we're trusted by people who demand more from their nutrition — and themselves.

Reviewer

“I’m a huge proponent for real food on the bike— sandwiches, pizza, burritos etc. Gnarly Nutrition Fuel20, Hydrate, protein & creatine really round out my nutrition. It’s easy to pack, all natural and tastes great too." —Lael Wilcox

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“The mountains are where I want to spend my days, preferably on my bike with friends, the further out the better. Gnarly products keep me going so I can spend more time out there." —Eric Porter

Why Choose Us?

Because what you put in your body matters. We obsess over quality, transparency, and performance so you don’t have to.

Science-Backed, Fully Transparent

Science-Backed, Fully Transparent

No proprietary blends. No filler. Every ingredient is dosed with purpose and backed by research.

Built as a System

Built as a System

Everyday, before, during, and recovery nutrition designed to work together across your entire training cycle.

Clean Ingredients

Clean Ingredients

Vegan-friendly options, minimal allergens, no artificial colors or flavors. Fuel that works for more bodies.

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Features Gnarly Other Brands
Non GMO
NSF Certified. Third-party Tested
Soy Free
Gluten Free
No Proprietary Blends
Science-back Formulas

*NSF Certified for selected products only

Frequently Asked Questions

No fine print, no confusion. These are the questions we hear most about our products, our standards, and how Gnarly fits into real training days.

When is it best to take Vitamin D?

Vitamin D is a fat-soluble vitamin. So any fat-soluble nutrient, like Gnarly Baseline D3, is always better absorbed when taken with food. As an aside, the same is true for something like turmeric, which is also fat-soluble.

Should a doctor test my vitamin D levels before supplementation?

If you have the access, it’s always a good idea to have your vitamin D tested annually to determine if you’re dealing with a clinical deficiency. When you’re tested, it will be your 25 hydroxy vitamin D levels that will be measured to determine Vitamin D status.

Usually if you’re vitamin D deficient, you’ll need to take more than 1,000 IUs to deal with that deficiency (the amount in one capsule of Gnarly Baseline D3).

Gnarly Baseline D3 was designed to help people avoid deficiency by providing the proper amount of supplementation (1000-2000 IUs daily) when lifestyle factors and environment might limit the amount of sunlight we get, and therefore vitamin D we naturally produce. 

For many this means supplementing in winter months when daytime hours are shorter and we spend less time outdoors with skin exposed.  For others supplementation may be required year round.

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average rating 5.0 out of 5
Based on 11 reviews
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100% of reviewers would recommend this product to a friend
11 Reviews
Reviewed by Greg M.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Great product

As a vitamin D supplement I feel I needed this for the fact that I may not get enough regularly.

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Reviewed by Jon L.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

As good as it gets!

*****

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Reviewed by Billy S.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Great to have on hand

I love that their baseline products are simple, and provide just the things that most athletes need a little extra of!

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Reviewed by Jessie N.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

not sure how to rate just yet

Have been using daily for a few weeks. I think my energy is better, less fatigue during the day and I do sleep better at night. easy to take.

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Reviewed by Jordan A.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Helped my Vit D levels!

Helped my Vit D levels!

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