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Vitamin D3 + K2

  • Supports a healthy immune system
  • Supports healthy teeth and bones
  • High potency. 5,000 IU of D3 and 100 mcg of K2 as MK7

Third Party Tested

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60-day Return Policy

High End Ingredients

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Love It

This is my favorite vitamin D I have found! I love that it also has K2 in it and it is one of the most affordable supplements compared to other brands that also include K2. They are easy to take and have helped my immune system! ~Lindsey

The combination of these two ingredients are essential for health.

Ensuring you have sufficient levels is incredibly important.

Assess each statement below. If you relate to one or more, then Vitamin D3 + K2 may be the vitamin D supplement you need:

  • I have darker skin.
  • I’m overweight.
  • I am 50+ years old.
  • My job is indoors.
  • I have to avoid sun exposure.
  • I’m looking for a high-potency vitamin D3 supplement that uses vitamin K2 as long-acting MK7.
  • My teeth are causing me problems. I’d like to support healthy teeth.
  • My child is experiencing a growth spurt. I want to support their teeth and bone development in a proactive, healthy way.
  • I live in areas of low sunshine. I know I need additional vitamin D3 with K2.
  • My blood sugar levels are high. I want to support healthy blood sugar levels.
  • I struggle with recurrent colds, styes, cold sores and get sick often. I want to support a healthy immune system.
  • My bones ache and are weaker. I want to support healthy, strong bones.
  • Lab testing shows that my vitamin D3 levels are low. I want to support healthy D3 levels safely by also supplementing with vitamin K2.

If a number of those resonated with you, then Vitamin D3 + K2 is something that you should seriously consider.

If none of the statements above relate to your current life situation, then Vitamin D3 + K2 is most likely not something you need right now.

Key Ingredients

Inside the Uncompromising Quality of Our Ingredients

  • D3 and K2
    Current research demonstrates that pregnant women require 4,000 IU (100 mcg) of vitamin D3. Taking D3 requires vitamin K2 in sufficient amounts. These two nutrients support every cellular process that occurs during pregnancy for both mother and developing baby.

Suggested Use

As needed, take 1 capsule with food any time of day or night, or as directed by your healthcare professional


Consult your healthcare professional prior to use. Do not use if inner tamper seal is damaged.

Suitable for

Vegetarians, Pregnancy, Breastfeeding, Bariatric, Methyl Sensitive

Delivery Method


How to Store

Keep closed in a cool, dry place out of reach by children.

  • No Artificial Flavors
  • No Artificial Colors
  • Wheat-Free
  • Tree-Nut-Free
  • Shellfish-Free
  • Sesame-Free
  • Soy-Free
  • Peanut-Free
  • GMO-Free
  • Gluten-Free
  • Fish-Free
  • Egg-Free
  • Dairy-Free

Generally speaking, Vitamin D3 + K2 is a supplement that you can use daily.

I prefer taking Vitamin D3 + K2 every night after dinner. I usually take it along with my other foundational supplements: Optimal Fish Oil and ProBiota HistaminX.

Pregnant or breastfeeding? Optimal Prenatal and Prenatal Essentials already provide you 4,000 IU of D3 and 100 mcg of K2 as MK7 with each serving. You should not need to supplement with Vitamin D3 + K2 unless your healthcare professional advised you to do so.

The safe daily upper limit intake of vitamin D3 for:

  • 4-8 years old is 3,000 IU
  • 9 years and above is 4,000 IU
You may use Vitamin D3 + K2 for kids 4 years old and up. You would not give it to them daily. Instead, you would give it to them every other day. This way, they stay within the safe upper limit range.

If they cannot swallow a capsule, you may open the capsule and empty the contents on a bite of food.

It’s recommended to test your vitamin D3 levels periodically with your doctor. You don’t want them too high or too low. If too high, it can contribute to high blood calcium levels. Ask your doctor to test blood calcium levels if you discover that your D3 levels are in the high range.

There is a lot of confusion about what the ideal vitamin D3 range is. Talk with your doctor about this.

I personally like to see my vitamin D3 levels between 30-50 ng/mL. I know some health professionals like to see vitamin D3 levels quite high for some conditions such as autoimmune disease. Follow your health professional’s recommendation.

Magnesium does support vitamin D3 metabolism. We don’t provide magnesium in any of our vitamin D3 supplements because it’s bulky. That would mean a larger capsule or multiple capsules per serving.

Where can you get extra magnesium? You can get 150 mg of magnesium from either Optimal Electrolyte or Optimal Magnesium. I drink Optimal Electrolyte every day so I don’t need to use Optimal Magnesium.

What our customers say

Real reviews from real customers.

Rated 5.0 out of 5 stars
Based on 545 reviews
Total 5 star reviews: 530 Total 4 star reviews: 14 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 1
98%would recommend this product
545 reviews
  • K
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    2 days ago
    Favorite Vit D!

    I love that these can be combined. We take this along with magnesium and it’s help raise our vitamin D levels!

  • R
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    3 days ago
    Best Vitamin D!

    I love Seeking Health because they are 3rd party tested and affordable! This Vitamin D3 + K2 does not disappoint. It has significantly helped me especially in the winter time when I'm not getting as much sun. Highly recommend!

  • MD
    Marianne D.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    2 weeks ago
    Love It!

    Been taking it for years.

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