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Vitamin D3 - 100 Capsules

Rated 4.9 out of 5 stars
179 Reviews

Vitamin D3 - 100 Capsules

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  • Supports a healthy immune system
  • Supports healthy mood and cognition
  • Supports bone health and bone density

Who Needs Vitamin D3

Do you wear sunscreen or live in a cloudy, dark, or polluted place? Do you eat a plant-based diet? Do you get sick frequently, have low moods, muscle weakness, or brain fog? If so, you might be struggling with vitamin D deficiency.

Darker skin and sunscreen reduce vitamin D conversion in the skin. Both lead to a greater reliance on food sources to get enough vitamin D. Fatty fish (like salmon and mackerel) are a good source of vitamin D. If fish is not accessible due to toxicity or food preferences, you may need vitamin D supplementation.

Vitamin D3 provides a potent serving (125 mcg or 5,000 IU) of the active form of vitamin D3.

Vitamin D3, also known as cholecalciferol, is considered a bioavailable form of vitamin D. Compared to vitamin D2 (ergocalciferol), it offers superior utilization in the body.

Vitamin D3 delivers a potent serving of active vitamin D3 in an easy-to-swallow vegetarian capsule. It provides 5,000 International Units (IU) or 625% of your Daily Value for vitamin D.

The role of vitamin D in the human body cannot be overstated. Benefits of vitamin D (as D3) include:

  • A healthy immune system
  • Bone health
  • Healthy bone density
  • Reduced risk factors for bone fractures
  • Brain health
  • Positive mood
  • Healthy muscle function
  • Cardiovascular wellness
  • Optimal calcium absorption
  • Healthy blood pressure
This vitamin D supplement is provided in an easy-to-swallow vegetarian capsule. Always take fat-soluble vitamin D with fatty foods for best absorption. For a vitamin D3 supplement that can be taken without food, consider our Vitamin D Drops.

Vitamin D3 is perfect for individuals with:
  • Low ultraviolet sun exposure
  • Darker skin
  • Older adults
  • Diets excluding seafood and dairy products
  • Those who cannot swallow capsules
  • Those looking for an easy, bioavailable delivery method
Vitamin D3 makes it easy to maintain healthy vitamin D levels. It’s the perfect companion to your favorite multivitamin. Get ready to experience the health effects of vitamin D with only one small capsule per day!

Customer Review

This is it

I have been using this product for six years and I am completely satisfied. I would never consider another one on the market because this one,I feel, is very pure and clean, and that matters to me. I strongly believe in this company and how it strives to bring, to one and all, the best each and every day. I have never been disappointed. bonus: customer support is the very, very best! ~Cynthia F.

Key Ingredients In Vitamin D3

  • Vitamin D3: Supports a healthy mood by initiating the first step of serotonin synthesis via activation of the TPH2 gene. Supports immune system function, muscular energy function, and bone health.

Why Vitamin D3 Works

Did you know that vitamin D is not actually a vitamin but a hormone? Vitamin D is known as a seco-steroid hormone. A hormone is a substance that travels to distant tissues and organs to change the behavior of cells. Hormones do this by binding to the cell's DNA and changing what genes are expressed.

The effects of vitamin D on gene expression appear to be far-reaching. Vitamin D increases the expression of genes in intestinal cells that allow for more calcium absorption. Thousands of different genes and cells are affected by vitamin D. In particular, immune cell function is significantly altered in the presence of vitamin D. In fact, some researchers are calling vitamin D one of the most important modulators of healthy immune cells in the human body.

Vitamin D also plays a role in tryptophan metabolism. Adequate cellular vitamin D induces the activity of the enzyme tryptophan hydroxylase 2 (TPH2). As shown in the StrateGene® Report, this enzyme facilitates the conversion of tryptophan to 5-HTP, which is a precursor for serotonin and melatonin. This may be one of the many ways that vitamin D helps to support a healthy mood and sleep.

As a fat-soluble vitamin, vitamin D is best absorbed when combined with dietary fats. Take Vitamin D3 with fat-containing foods for optimal absorption. For a liquid vitamin D3 supplement that can be taken without food, consider our Vitamin D Drops.

Vitamin D3
Supplement Facts

Serving Size: 1 Capsule
Servings Per Container: 100

Vitamin D3 (as cholecalciferol) 125 mcg (5000 IU) 625%
DV = Daily Value

Other Ingredients: Microcrystalline cellulose, vegetarian capsule (hypromellose and water), ascorbyl palmitate, and silica.

  • Suitable For: Vegetarians
  • Delivery Method: Capsules
  • How To Store: Keep closed in a cool, dry place out of reach by children.

Free Of: Dairy, Eggs, Fish, Gluten, GMO, Peanuts, Shellfish, Soy, Tree Nuts, Wheat, Artificial Colors, Artificial Flavors, and Artificial Preservatives

How to Use Vitamin D3

Suggested Use

Take 1 capsule daily with food or as directed by your healthcare professional.


Children and pregnant or breastfeeding women should consult their healthcare provider prior to use. Do not use if tamper seal is damaged. Do not exceed suggested use without physician consultation.

How to Enhance Vitamin D3


Monitor Your Vitamin D

Consider getting a routine blood test to track your vitamin D status. This can help you maintain vitamin D blood levels in an optimal range. Low vitamin D levels or vitamin D deficiency may increase your risk for health issues and certain medical conditions. On the other hand, elevated levels of vitamin D or too much vitamin D from higher doses of vitamin D supplements can lead to vitamin D toxicity and other adverse side effects.


Pairs Well With

Optimal DHA, a fish oil source of omega-3 fatty acids for optimal brain function, cognition, and heart health. Optimal Electrolyte, to support cellular hydration and water balance required by your brain and immune system. Optimal Magnesium, to support strong bones alongside vitamin D..


Clean Your Genes

After years of suffering from unexplainable health issues, Dr. Ben Lynch, ND discovered the root cause - "dirty" genes. In his best-selling book, Dirty Genes, Dr. Ben Lynch describes the steps you can take to promote optimal epigenetic health. Ready to get started? Click here to take the Dirty Genes Quiz to find which of your genes are dirty!

Why Choose Seeking Health

Here at Seeking Health, we are committed to providing you the best in bioavailable supplements, methylation support, prenatal vitamins, genetic analysis tools, and more.

We strive to go above and beyond the average supplement company, which is why we allocate significant resources to testing all of our supplements for purity, potency, and label claims.

  • Third-party tested for heavy
    metals, microbials, and potency
  • Scientifically formulated by Dr. Ben Lynch, ND
  • Manufactured in the USA from globally
    sourced ingredients
  • Nutrients in their bioavailable
    forms for optimal absorption
  • cGMP facility registered by NSF International
Purity & Potency Tested & Assured
Scientifically Formulated by Dr. Ben Lynch
Manufactured in the USA from globally sourced ingredients third-party independently tested
Bioavailable Nutrients

FAQs for Vitamin D3

What is the purpose of each ingredient in Vitamin D3?

Ingredients Purpose
Vitamin D3 (as cholecalciferol) Provides natural vitamin D support for a balanced mood and healthy immune system; Adequate calcium and vitamin D throughout life, along with physical activity, may reduce the risk of osteoporosis later in life

Why is Vitamin D3 not suitable for vegans?

Vitamin D3 is suitable for vegetarians. The vitamin D3 is derived from sheep’s wool, making Vitamin D3 unsuitable for some vegans. This vitamin D3, however, is derived from wool that is sheared from live healthy sheep, so no animals are harmed in the process.

Who is Vitamin D3 intended for?

Vitamin D3 is a pure and potent vitamin D3 supplement in a vegetarian capsule. It is intended for anyone seeking to support healthy vitamin D levels. This product is perfect for individuals with low sun exposure, a diet that excludes seafood or dairy products, and those who cannot swallow capsules. Vitamin D3 occurs naturally in fatty fish, cod liver oil, egg yolks, and beef liver. Vitamin D3 contains cholecalciferol derived from cholesterol in sheep’s wool, making it suitable for vegetarians.

The amount of vitamin D needed by each individual varies for a number of reasons, such as the use of sunscreen, skin tone, and climate. Because vitamin D is a fat-soluble nutrient, and dosing can vary, we recommend consulting with your healthcare provider for medical advice to determine your optimal dose.

Vitamin D is required for optimal absorption of minerals including calcium, making it an important nutrient for supporting healthy bones and structural health. It may also play a role in supporting immune health and cellular integrity.

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What our customers say

Real reviews from real customers.

Rated 4.9 out of 5 stars
Based on 179 reviews
Total 5 star reviews: 168 Total 4 star reviews: 7 Total 3 star reviews: 2 Total 2 star reviews: 0 Total 1 star reviews: 2
98%would recommend this product
179 reviews
  • KW
    Kristin W.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    1 hour ago
    One of Our Favorites!

    This has been one of our family's daily “go to” everyday for the last three years and have remained on it for cellular support!!!!

  • JB
    Jeanine B.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    1 month ago
    Works great

    My vitamin D was low and my doctor recommended supplements to raise my levels. I have been taking it and I feel much better. Works great!!

  • JG
    James G.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    2 months ago

    I’ve been taking this Vitamin D3 for about 3 years, it’s steady and always performs well!

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These statements have not been evaluated by the Food and Drug Administration (FDA). This product is not intended to diagnose, treat, cure, or prevent any disease.