My product reivew
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 vitamn 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: (115) 5 star ratings. (9) 4 star ratings. (0) 3 star ratings. (2) 2 star ratings. (2) 1 star ratings.
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I absolutely love the Isotonix Vitamin D with K2. Isotonix have the best absorption.
Response from Customer Service on 05/06/2026
Thank you so much for your wonderful review of Isotonix® Vitamin D with K2! We're thrilled to hear how much you love the product and appreciate your kind words about its absorption. Your feedback means a lot to us, and we’re grateful for your continued support and loyalty. Thank you for being a valued customer!
Sugary supplement
2 out of 5 star rating.
It contains sugar, fructose, and maltodextrin which are not good for health. Especially with people who had diabetes.
Response from Customer Service on 04/23/2026
Thank you so much for your feedback on Isotonix® Vitamin D with K2. We truly appreciate you taking the time to share your thoughts with us.
The small amount of sugar included in Isotonix products is necessary to facilitate our unique isotonic delivery system, which helps maximize nutrient absorption. Please be assured that we strive to source the highest quality ingredients for our customers’ well-being.
We understand your concern, especially when it comes to managing conditions like diabetes. We always recommend that individuals with medical conditions or those taking medication consult their treating physician before starting any new supplement. Only your healthcare provider can determine what’s appropriate for your specific needs.
For diabetic patients, if their physician approves the use of Isotonix products, we suggest they consider replacing a serving of fruit with a serving of Isotonix, as guided by their physician. Ultimately, your healthcare provider is the best resource when it comes to managing your dietary needs.
Thank you again for your feedback. If you have any further questions or need more information, please feel free to reach out.
Great product
5 out of 5 star rating.
I am loving these vitamins
Response from Customer Service on 04/20/2026
Thank you so much for your wonderful review! We're delighted to hear that you're loving Isotonix® Vitamin D with K2. Your feedback means a lot to us—thank you for being a valued member of our community!
Great product
5 out of 5 star rating.
Just add water and mixes itself. I cannot take vitamin D in pill form, harsh on my stomach. This is very gentle and apparently works very well as shown in my bloodwork results! So glad this product exists and known by my doctor who recommended this product to me.
Response from Customer Service on 04/15/2026
Thank you so much for your wonderful review! We're delighted to hear that nutraMetrix Isotonix® Vitamin D with K2 is easy to use, gentle on your system, and recommended by your doctor. Your experience and feedback mean a lot to us—thank you for being a valued member of our community!
A must have.
5 out of 5 star rating.
In my household Vitamin D has to be a staple. I don't notice it so much in myself, but my 19 year old son is a completelyl different (more pleasant) person when he's taking Vitamin D. Tastes great.
Response from Customer Service on 03/03/2026
Thank you so much for your wonderful review! We're delighted to hear that Isotonix® Vitamin D with K2 has become a staple in your household, and that your family enjoys the taste and benefits. Your feedback means a lot to us—thank you for being a valued member of our community!
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