• Bio-Avail D3/K2
  • Bio-Avail D3/K2
  • Bio-Avail D3/K2
  • Bio-Avail D3/K2

Bio-Avail D3/K2

3-6 month supply

A Highly Absorbable Blend of Vitamins D3 and K2

Bio-Avail D3/K2

3-6 month supply

A Highly Absorbable Blend of Vitamins D3 and K2

Restore optimal D3 and K2 levels with this clean, easy-to-absorb, liquid formula.

  • Supercharge your immune, metabolic, cardiovascular, and bone health

  • Flexible dosing: 1,000 IU of D3 and 120 mcg of K2 per one-drop serving

  • Only 3 ingredients: MCT oil, D3, and K2. No artificial fillers or junk!

  • High-potency formula (600 servings per bottle!) saves you money and time.

Delivers every
($15.30/per serving)
($17/per serving)

Free US Shipping on orders over $85

60-day Returns

RESTORE OPTIMAL D3 LEVELS

Overcome Vitamin D Inadequacy (>90% of Americans)

Support immune function, heart and metabolic health, mood, cognitive function, strong bones

BOOST VITAMIN K2 INTAKE

Protect Your Bones and Heart

Experience the synergistic benefits of D3 and K2 for cardiovascular and bone health.

PERSONALIZE YOUR DOSE

Fine-Tune Your Daily Dose

With 1,000 IU of D3 and 120 mcg of K2 per drop, our flexible liquid formula makes it easy to get exactly the amount you need.

SAVE MONEY & TIME

Affordable and Efficient D3/K2 Benefits

Our high-potency formula provides a clean source of D3/K2 at less than 6 cents per serving.

Powerful Nutrients & Vitamins

Vitamin D3

Vitamin D3

1,000 IU of vitamin D3 in a highly absorbable, liquid form. Avoid seasonal fluctuations of vitamin D levels and optimize your intake no matter where you live or what time of year it is. 

Vitamin K2

Vitamin K2

120 mcg of vitamin K2 in MK-4 form. Get the full benefits of vitamin K2 by taking one of the most effective forms.

MCT Oil

MCT Oil

MCT oil is a perfect carrier for D3 and K2 because it is rapidly absorbed and is a great energy source. It has a clean, neutral taste with no sweeteners, artificial flavors, binders, or fillers.

Signs You Need Bio-Avail D3/K2

Frequent colds & flu

Low mood

Weak bones

Metabolic difficulties

Brain fog, poor memory

Cardiovascular risk

What You'll Feel Using Bio-Avail D3/K2

  • Better immune function

  • Stronger bones

  • Sharper mind

  • Elevated mood

  • Healthier metabolism

  • Improved cardiovascular function

  • Greater longevity

60-Day Money Back Guarantee

60-Day Money Back Guarantee

We're confident you'll love our products, but if you're not completely satisfied, we offer a 60-day, 100% money-back guarantee on all purchases. Simply contact us for a full refund, no questions asked. Buy with confidence knowing you're covered by our guarantee.

The Adapt Naturals Standard

The Adapt Naturals Standard

In our increasingly toxic world, the last thing you want to worry about is a lot of artificial junk in your supplements. Adapt Naturals supplements are made with the cleanest possible ingredients, without gluten or GMOs. Our products are manufactured in a U.S. facility that meets the NSF’s rigorous GMP regulatory standards.

Third-Party Lab-Tested with Transparent Results

Third-Party Lab-Tested with Transparent Results

We conduct third-party testing on all our products to verify their purity, potency, and safety. Most importantly, we transparently share these results with our customers by posting Certificates of Analysis (COAs) and test results directly on our website. We want you to have full confidence that you’re getting exactly what you think you are with each purchase.

See Test Results

Real Stories of Health and Happiness

  • "Great price for a high quality vitamin D that will last a VERY long time."

    —Lauren, Verified

  • “I really like the fact that these two vitamins are combined in liquid form.”

    —Dianne, Verified

  • “This is so easy to take daily!”

    —Michelle, Verified

Discover the Bio-Avail D3/K2 Advantage

 
Competitors
Ingredients
Natural, whole-food
Synthetic, fillers
Absorbability
Maximally absorbable
Low absorption
Health Focus
Addresses root causes
Addresses symptoms
Clinical Background
15 years in-clinic
Not typically
Sustainability
Supports soil health
Disregards soil health
Packaging
Glass/recyclable
Single-use plastics
Founder
Functional Medicine expert
Marketers
Try Now

Meet Chris Kresser, your
Trusted Health & Wellness Guide

Founder & Functional Medicine Clinician

  • Globally renowned expert with over 15 years of experience
  • Dedicated to helping people improve their health by addressing modern challenges and nutrient gaps

Author & Educator

  • Treated thousands of patients
  • Trained more than 2,000 healthcare professionals
  • Gained valuable insights into functional medicine and nutrition

Why choose Bio-Avail D3/K2?

Our modern diets often fall short of providing the optimal amounts of essential nutrients our bodies need to function at their best. With the Bio-Avail D3/K2, you can overcome nutrient deficiency and support your overall health and well-being. We've done the research, so you don't have to!

Formulated to Replicate Optimal Ancestral Diets

Changes in dietary patterns, declining soil quality, and a growing toxic burden have made it increasingly difficult to obtain adequate nutrients from our daily food intake. Most Americans don’t get enough vitamin D and K2—with potentially serious consequences. With just a few drops of Bio-Avail D3/K2 daily, you’ll never have to worry about falling short of these critical nutrients again!

Harness Years of In-Clinic Experience and Ancestral Wisdom

Backed by Adapt Naturals' 15 years of in-clinic experience and dedicated to creating supplements that make a meaningful difference, Bio-Avail Omega+ combines cutting-edge research with insights from ancestral wisdom to bring you a premium-quality supplement.

Bio-Avail D3/K2

Unlock Your Optimal Health

Upgrade Your Wellness with Bio-Avail D3/K2—Lifelong Health, Simplified

Get Healthier & Happier - Try Now

Good For You—And the Planet

You can’t have healthy humans without a healthy planet. That’s why Adapt Naturals is working toward zero plastic and landfill waste in our supply chain.

Starting in the fall of 2023, we’re transitioning our packaging to 100% compostable, stand-up pouches. They’re made from cellulose (wood pulp) and are free of PLA, BPA, PFAS, phthalates, and other harmful chemicals. They’re printed with non-toxic, compostable ink. The pouches are so clean and biodegradable that you can put them in your backyard or curbside compost bin! 

Our sustainable packaging initiative will prevent over 120,000 plastic bottles from ending up in a landfill or the oceans. Thank you for being part of the solution and helping Adapt Naturals protect the beauty of our natural environment!

Your Questions Answered

Take one to five drops per day with or without food as directed by your healthcare provider. The optimal dosage will depend on your individual needs and whether you take vitamin D3 and/or K2 in other products.

We suggest consulting with your healthcare provider to determine your optimal dose of vitamins D3 and K2. Bio-Avail Multi contains 2,000 IU of vitamin D3 and 50 mcg of vitamin K2. Bio-Avail D3/K2 contains 1,000 IU of vitamin D3 and 120 mcg of K2 per serving/drop. This makes achieving your optimal dose of both nutrients easy according to your healthcare provider’s recommendations.

The shelf life is two years.

The MCT oil is derived from coconuts. This product is not suitable for people who are allergic to coconuts.

No, it is not vegan. The vitamin D3 is sourced from lanolin, which comes from the glands of wool-bearing animals.

Yes, all Adapt Naturals products, including Bio-Avail D3/K2, undergo rigorous third-party testing for purity and potency. Most importantly, we transparently share these results with our customers by posting Certificates of Analysis (CoAs) and test results on our website. This level of openness is almost unheard of in the supplement industry. It allows you to see exactly what’s in the product you’re putting into your body. Click here to view the most recent CoA and test results.

Customer Reviews

Based on 33 reviews
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K
Karyn Spaeth
Dropper hard to control

Tricky to control for desired number of drops. Tends to leak extra. Also, expires sooner than expected as compared to other brands we’ve tried. However, do like the K2 type and dose

Hi Karyn,

Thank you for your thoughtful feedback on Bio-Avail D3/K2!

You raise valid points about the dropper control. Here's a tip that many customers find helpful: Try holding the dropper at a 45-degree angle and applying gentle pressure to get more precise single drops. If you continue to experience difficulties, please reach out to our customer service team - we're happy to provide additional guidance.

Regarding the date on the bottle - I want to clarify that this is actually a 'best by' date, not an expiration date. The three ingredients in our D3/K2 (vitamin D3, vitamin K2, and MCT oil) are quite stable and unlikely to degrade significantly within a two-year timeframe. While we're required by regulations to include this date, your bottles will still be safe and effective to use beyond the date listed. At most, there might be an extremely slight decrease in potency over time, but even this is unlikely within two years of manufacture. We're currently working with our manufacturer to obtain additional documentation that will help us better communicate this to customers in the future.

We're glad you appreciate our choice of K2 forms and dosing. Our formula includes both MK-4 and MK-7 forms of K2 (60 mcg each) for optimal absorption and effectiveness.

If you'd like to discuss your concerns further or need any additional tips, please don't hesitate to contact our support team.

Thank you for choosing Adapt Naturals. We're committed to helping you get the most out of our products!

K
Kate McAnany
Trust the product!

I just started taking this; however, I love that I can give this to my infant and toddler during the “sick/winter season” and feel confident they are getting a great supplement. I started taking it myself about a week ago and have warded off all Thanksgiving week illnesses this far. Excited to add this to my routine.

Hi Kate, We are thrilled to hear of the wonders our Bio-Avail D3/K2 is doing for you and your kids. We are happy you gave it a try. Thank you for sharing your experience and for supporting our brand. All the best!

S
Shiloh Cadieux
Adapt Naturals Made Quality Products

I have been feeling calmer, more energetic and happier since I started using your vitamins, especially the D3/K2. Thanks!

Hi Shiloh. We are thrilled to hear you have noticed improvements in your mood and energy levels. Thank you for trying our Bio-Avail D3/K2 and sharing your experience. All the best!

S
Sharon Shin
Educated

I trust the research done by Chris, and knowing how complicated bone health is; I know that I am doing the best I can for my bones, despite genetic predisposition to osteoporosis. There is nothing better or guaranteed that doesn't have horrible possible side effects and guaranteed side effects.

Hi Sharon, Thank you for reviewing our Bio-Avail D3/K2. We are glad you chose us for your supplement needs. We appreciate your support. Best of health!

G
Gregg Stutzman
Great Products Review

Quality products/ingredients, with the added benefit of maximum absorption through bio-availability! "Clean'' company!

Hi Gregg, Thank you for reviewing our Bio-Avail D3/K2. We are glad you chose us for your supplement needs. We appreciate your support. Best of health!

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