Sunshine in a bottle!
5 out of 5 star rating. 
Fuel your body for the day ahead!
68%
of people are vitamin D deficient. Vitamin D plays an essential role in bone, heart and immune health, working with vitamin K to support absorption of calcium and healthy arteries.
10,000 IU
Recommended daily upper limit of vitamin D
Shine Bright With Essential Support
Vitamin D3 (cholecalciferol) Vitamin D plays an important role in bone health, heart health and immune support while working with vitamin K to support normal absorption of calcium and promote healthy arteries. Vitamin D is a fat-soluble vitamin that is found in some foods and endogenously produced when sunlight strikes the skin and activates vitamin D synthesis.
Product Classification
Isotonic
Vegetarian
Gluten-Free
Dairy Free
No Detectable GMO
Good Manufacturing Practices
Directions for Use
Pour 1 level capful of powder into the measuring overcap of the white bottle.
Add water to the line in overcap (2 fl. oz/60 mL) and stir.
Enjoy once a day; for maximum absorption, take with a meal.
Key Ingredients & Benefits
Vitamin K2*
Supports normal delivery of calcium to the bones
Promotes healthy arteries and elasticity of blood vessels
Helps maintain bone mass
Supports calcium utilization
Vitamin D3 (Cholecalciferol)*
Supports immune health
Helps maintain bone mass by supporting normal osteoclast activity
Helps maintain normal blood pressure
Helps maintain bone health
Benefits Beyond Your Bones
Isotonix® Vitamin D with K2 is the first of its kind to deliver both of these powerful vitamins with isotonic delivery. The unique relationship between vitamin K and D enables support for calcium absorption and utilization.
Isotonix Delivery System
:05 minutes
Isotonix Liquid Vitamins
- Formulated to survive digestion.
- Delivers concentrated nutrients to the site of absorption.
- Contains no fillers or binders.
- No artificial color or flavors.
:40 minutes
Standard Vitamin Tablet
- Contains lab-created coatings and lubricants.
- Often contains artificial colors, nutrients and flavors.
- Limited absorption of nutrient utilization.
Frequently Asked Questions
Why is vitamin K included in Isotonix Vitamin D with K2?
Some studies have concluded that vitamin K2 does not interfere with anticoagulant medications; however, most products containing vitamin K (including K1 and/or K2) warn users taking anticoagulants not to take the product. If you are currently taking warfarin or another anticoagulant medication, you should consult your physician before taking any product containing vitamin K1 or K2.
Is it safe to take more than one serving of this product daily?
One serving daily of Isotonix Vitamin D with K2 is recommended. Check with your physician before taking additional daily servings of this product.
What are dietary sources of vitamin D?
Foods rich in vitamin D include cod liver oil, salmon, mackerel and tuna.
Is there a toxicity level for vitamin D?
Studies have shown that healthy adults taking 125 mcg of vitamin D daily for extended periods rarely experience toxicity, as long as blood calcium and vitamin D levels are monitored. Vitamin D toxicity is very rare and usually occurs with much higher doses (more than 250 mcg per day) over long periods.
Research Scope
*These statements have not been evaluated by the Food and Drug Administration. This product(s) is not intended to diagnose, treat, cure or prevent any disease.
Reviews
Break down of ratings: (121) 5 star ratings. (9) 4 star ratings. (0) 3 star ratings. (2) 2 star ratings. (2) 1 star ratings.
would recommend this product.
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Living in New England, especially during the winter months, I like having a Vitamin D product that's easy to take consistently. This one has become a permanent part of my morning routine.
Response from Customer Service on 06/15/2026
Thank you so much for your wonderful review of Isotonix® Vitamin D with K2! We're delighted to hear it's become your "sunshine in a bottle" and an essential part of your morning routine, especially during the New England winters. Your feedback means a lot to us. Thank you for being a valued customer!
Daily Routine
5 out of 5 star rating.
My doctor did some blood work and it showed I had a eficiency in vitamin D. I started taking a cap off our isotonix Vitamin D with K2 each day. It has made a difference in my energy level and helping me in my maintaining my blood pressure levels. Now my levels are in great shape
Response from Customer Service on 06/15/2026
Thank you so much for your wonderful review of Isotonix® Vitamin D with K2! We're delighted to hear it's made a positive difference in your energy and wellness routine, and that your levels are now in great shape. Your feedback means a lot to us. Thank you for being a valued customer!
Know Your Levels!
5 out of 5 star rating.
It is important to know your Vitamin D level; not just if it is 'normal', but the actual number. Supplement with this product for optimal health!
Response from Customer Service on 06/12/2026
Thank you so much for your insightful review of nutraMetrix Isotonix® Vitamin D with K2! We're glad you value the importance of monitoring Vitamin D levels and appreciate your trust in our product for supplementation. Your feedback means a lot to us. Thank you for being a valued customer!
optimal “D” levels
5 out of 5 star rating.
After years of trying to bring up his Vitamin D level, it was 7 which was the lowest his doctor had ever seen, my husband started taking 2 servings a day of isotonix vitamin D.
When he had his levels tested again he had finally reached the optimal level his Doctor recommended!
Response from Customer Service on 06/12/2026
Thank you so much for sharing your experience with Isotonix® Vitamin D with K2! We're delighted to hear your husband achieved his recommended levels and found the the product beneficial in his wellness routine. Your feedback means a lot to us. Thank you for being a valued customer and for choosing Isotonix® for your wellness routine!
Isotonix Vitamin D with K2
5 out of 5 star rating.
I need all the support for immune health, maintain bone mass, normal blood pressure and bone health!! And love the taste!!
Response from Customer Service on 06/08/2026
Thank you so much for your wonderful review of Isotonix® Vitamin D with K2! We're delighted to hear you appreciate the support it offers and that you love the taste. Your feedback means a lot to us. Thank you for being a valued customer!
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