• 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
($10.49/per serving)
($11.65/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 38 reviews
92%
(35)
8%
(3)
0%
(0)
0%
(0)
0%
(0)
K
Kimberly Albers

I like the combination in liquid form.

S
Samantha Driscoll
Great products all around!

Very happy with our purchase and have already re-ordered! My kids take it and call it the water supplement it has little to no taste!

We love this brand!!

Hi Samantha,

Thanks for this feedback about Bio-Avail D3/K2! We love hearing that it's become a family favorite, especially that your kids have given it the adorable nickname 'water supplement.' You're right about the neutral taste - we specifically formulated it with MCT oil as the carrier to ensure a clean, virtually tasteless experience that works for everyone, including kids.

It's great that you've made vitamin D supplementation a family priority. With most Americans not getting enough D3, and K2 being equally crucial for growing bones and cardiovascular health, you're giving your family an excellent foundation for optimal health.

We truly appreciate your trust in Adapt Naturals. Thank you for being part of our community and for taking the time to share your experience!

M
Mariana Kostova
Great product

The best in the market! We all need it. Love it!

Hi Mariana,

Thank you for your review of Bio-Avail D3/K2! You're absolutely right - with most Americans not getting enough vitamin D, and K2 being even harder to obtain from modern diets, these nutrients are essential for optimal health. The liquid formula makes it easy to get exactly the amount you need, and at less than 6 cents per serving, it's both effective and affordable.

Thanks for being part of the Adapt Naturals community!

M
Min Han
Vitamin D/K

So far so good! I’ve been taking 10k iu daily and am feeling much better! The liquid is easy to take and doesn’t have a taste at all, which is fantastic for me! No weird aftertaste! I would definitely buy again!

Hi Min,

Thank you for the review of Bio-Avail D3/K2! We're thrilled to hear you're feeling better and enjoying the neutral taste. We specifically chose MCT oil as the carrier because it's both highly absorbable and has a clean, neutral flavor.

Thank you for choosing Bio-Avail D3/K2. We look forward to continuing to support your health journey!

J
Julie Z
High quality and clean

This is our first time using these supplements and I'm so glad we got them! They are third party tested, so they actually say what they are and are CLEAN! The omegas are easy to swallow and don't have any fishy after taste. The vitamin d/k is really great to just put in your morning lemon water with breakfast and so easy to drop in! We will definitely be adding these supplements to our lifestyle in the long run!

User picture

Hi Julie,

Thanks for this great review! Love hearing that the D3/K2 drops work so well in your morning lemon water. And you're absolutely right about the testing - we're serious about keeping each product clean and pure. So glad you've found supplements that fit easily into your routine!

123