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Certified Grass-Fed Collagen Peptides with Optimal 2 kDa Molecular Weight


Get the purest collagen made with SOLUGEL®—the only collagen ingredient with third-party certified grass-fed verification—plus clinically-optimized molecular size for maximum absorption!

✓ 10 grams of SOLUGEL® certified grass-fed collagen peptides per serving 

✓ Optimal 2 kDa molecular weight for superior absorption and bioavailability

✓ Support skin elasticity, joint comfort, and gut health 

✓ Dissolves completely clear—odorless and tasteless in any beverage

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See What Others Are Saying About Bio-Avail Collagen+

  • "I push my body hard, typically upwards of 15 hours of training per week, encompassing Ice Hockey, Resistance Training, and Performance training (agility, power, speed, etc.). Incorporating Bio-Avail Collagen + into my routine has decreased muscle fatigue and increased desired energy output. My HRV is trending up, as are my readiness and sleep scores via Oura. I highly recommend it."

    —Jator

  • "I have tried MULTIPLE collagen powders, liquid collagen, and collagen pills. I am a bit of a supplement "junkie";). I stopped buying collagen because I felt the quality wasn't consistent. I placed my old collagen and the Adapt Naturals head to head, and the Adapt had ZERO taste (which is a positive thing!) and dissolved much better than my old collagen powder. Chris and the Adapt team have done it again... you just can't beat the quality of their products. I am hooked!"

    —Rebecca

  • "I've been taking collagen (a different brand) for almost a year without seeing much change in my joints or skin. After only a month of Bio-Avail Collagen+, the creaking in my knees has gone away, and I've had creaking in my knees for years!"

    —Tyler

Introducing the first certified grass-fed collagen with optimal molecular weight—all in one pouch!

Bio-Avail Collagen+ is the first and only collagen supplement that combines SOLUGEL® certified grass-fed collagen peptides with a scientifically-optimized 2 kDa molecular weight for maximum absorption and effectiveness.

Unlike other collagen supplements that use unverified "grass-fed" claims or sub-optimal molecular sizes, Bio-Avail Collagen+ provides 10 grams of collagen peptides that dissolve completely clear and are efficiently absorbed to support your skin, joints, and gut health.

Bio-Avail Collagen+ is the first and only supplement to combine certified grass-fed verification with optimal molecular sizing in a single product.

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What makes Bio-Avail Collagen+ stand out?

  • Certified grass-fed collagen you can trust

    Bio-Avail Collagen+ uses SOLUGEL® certified grass-fed collagen peptides - the only collagen ingredient certified by LIAF Control in collaboration with the American Grassfed Association. This isn't just a marketing label. It's third-party verification that cattle spend their entire lives on pasture, with no hormones, antibiotics, or grain feed.

  • Optimized for maximum absorption

    Bio-Avail Collagen+ features collagen peptides precisely sized at 2 kilodaltons (kDa) - the optimal molecular weight for absorption. This means the peptides dissolve completely clear in any beverage, absorb efficiently through your digestive tract, and actually reach your skin, joints, and gut where they're needed.

  • Research-validated therapeutic dose

    Bio-Avail Collagen+ provides a full 10 grams of collagen per serving - the amount shown in clinical studies to deliver meaningful results. Many brands only include 2.5 to 5 grams to cut costs. We refuse to compromise on effectiveness.

  • Just one pure ingredient

    Bio-Avail Collagen+ contains only certified grass-fed collagen peptides. Nothing else. No fillers, no sweeteners, no artificial flavors or colors, no "proprietary blends." This single-ingredient purity means no hidden additives to trigger sensitivities and maximum collagen content in every scoop.

Formulated to Transform Your Skin, Joints & Vitality from the Inside Out

After treating thousands of patients over 15 years, I discovered why most collagen supplements fail—and created the clinical breakthrough that has helped thousands of people reclaim their youthful vitality. Bio-Avail Collagen+ was formulated to address the root causes of collagen decline, not just mask symptoms.

Unlike traditional approaches that rely on unverified "grass-fed" claims (which have no legal definition), sub-optimal molecular weights that don't absorb well, or inadequate dosing that can't deliver clinical results, Bio-Avail Collagen+ provides the exact protocol I used in my clinic to help patients achieve remarkable transformations.

Bio-Avail Collagen+ promotes more elastic and hydrated skin, comfortable and flexible joints, faster recovery after activity, stronger hair and nails, and improved gut lining integrity—transforming your health from the foundation up.

Here are some benefits you can expect from this clinically-formulated collagen:

✓ Visibly improves skin elasticity and hydration. Say goodbye to dry, sagging skin and fine lines. Feel confident with smoother, more youthful-looking skin that glows from within.

✓ Supports comfortable, flexible joints. No more morning stiffness or post-workout discomfort. Experience the freedom to move without limitations and stay active as you age.

✓ Promotes stronger hair and nails. Watch as brittle nails become strong and hair regains its shine and thickness. Look and feel your best from head to toe.

✓ Enhances gut lining integrity. Support your digestive health and nutrient absorption. A healthy gut means better overall wellness and vitality.

✓ Accelerates recovery after activity. Bounce back faster from workouts and daily activities. Wake up refreshed and ready to take on the day.

✓ Promotes deeper, more restful sleep. The glycine in collagen helps regulate sleep cycles and body temperature. Experience the restorative sleep your body needs for optimal health and vitality.

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Bio-Avail Collagen+ contains:

CERTIFIED GRASS-FED COLLAGEN PEPTIDES (SOLUGEL®)

CERTIFIED GRASS-FED COLLAGEN PEPTIDES (SOLUGEL®)

10 grams of certified grass-fed bovine collagen peptides per serving. Unlike 95% of "grass-fed" collagen products that make unverified claims, SOLUGEL® is the only collagen ingredient certified by LIAF Control in collaboration with the American Grassfed Association, ensuring cattle are pasture-raised for life without hormones or antibiotics.

OPTIMAL MOLECULAR WEIGHT (2 kDa)

OPTIMAL MOLECULAR WEIGHT (2 kDa)

Precisely sized collagen peptides that dissolve completely clear without clumping or cloudiness. This optimal size ensures maximum absorption through your digestive tract, allowing more collagen to reach your skin, joints, and tissues where it's needed most.

TYPES I & III COLLAGEN

TYPES I & III COLLAGEN

The two most abundant collagen types in your body, specifically supporting skin elasticity, joint comfort, bone strength, and gut lining integrity. These are the exact types that decline with age and need replenishment.

SINGLE-INGREDIENT PURITY

SINGLE-INGREDIENT PURITY

Just pure collagen peptides - nothing else. No fillers, sweeteners, flavors, colors, or preservatives that could trigger sensitivities or dilute effectiveness. What you see is what you get: 100% collagen.

Bio-Avail Collagen+ gives you clinically-proven collagen supplementation in its purest, most effective form—at a significantly lower price than you'd pay for inferior products.

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Adapt Naturals Bio-Avail Collagen+

Bio-Avail Collagen+ is the most transparently sourced, clinically formulated collagen supplement on the market. No other product combines certified grass-fed verification, optimal molecular weight, research-validated dosing, and single-ingredient purity in one superior formula.

  • Certified grass-fed collagen with third-party verification 
  • Optimal 2 kDa molecular weight for maximum absorption 
  • Research-validated 10-gram therapeutic dose 
  • Single-ingredient purity without fillers or additives 
  • Dissolves completely clear in hot or cold beverages 
  • Formulated by globally-renowned Functional Medicine clinician Chris Kresser 
  • Made without gluten and GMOs 
  • Manufactured in the US in a certified GMP facility

Signs You Need Bio-Avail Collagen+

Fine lines, wrinkles, or sagging skin

Joint stiffness or discomfort, especially in the morning

Longer recovery time after exercise or activity

Thinning hair or brittle nails

Digestive issues or gut discomfort

Feeling less resilient than you used to

What You'll Feel Using Bio-Avail Collagen+

  • Smoother, more hydrated skin with improved elasticity

  • Comfortable, flexible joints throughout the day

  • Faster recovery and less soreness after activity

  •  Stronger, healthier hair and nails

  • Better digestive comfort and regularity

  •  Enhanced overall vitality and resilience

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

"I'm excited about Adapt Naturals and Bio-Avail Multi. Chris is a leading clinician, educator, and researcher in the Functional Medicine space. I've learned a lot from him about nutrition and supplements over the years, and I know his products are fueled by high-quality, evidence-based ingredients you can trust."

Dr. Mark Hyman MD

14-time New York Times best selling author and founder of the Cleveland Clinic Center for Functional Medicine

"Chris Kresser is one of the sharpest minds in the functional / integrative medicine space. I have reached out to Chris many times when working to unravel my own health journey and his insights have always been incredible. Given all that, I'm super excited for the release of Adapt Naturals line of supplements, especially Bio-Avail Multi. Chris and I are aligned in that we believe the bulk of our nutrition should come from whole, minimally processed foods, but we also recognize that the right supplement, at the right time can 'change everything.'"

Robb Wolf

Former research biochemist and 2-time New York Times bestselling author of The Paleo Solution and Wired To Eat.

"I can't think of a better person to formulate supplements than Chris Kresser. I trust his ability to skillfully combine ancestral wisdom with modern science and cutting-edge research. Taken together, the products offer a well-rounded and complete way to boost your nutritional status. I am excited about this high-quality, comprehensive new product line - I strongly recommend it!"

Dr. Akil Palanisamy MD

Harvard-trained physician, author, speaker, and holistic medicine expert in integrative and functional medicine

"I trust Chris Kresser with my life, and you will too."

Sara Gottfried MD

Harvard Trained Physician and New York TimesBestselling author of The Hormone Cure

Choose Your Bio-Avail Collagen+ Package

FREE pouch of Bio-Avail Omega+ included. Plus, free shipping when you order 3 or more pouches!

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About your FREE Bio-Avail Omega+

The perfect complement to complete your ageless vitality transformation!

Bio-Avail Omega+ supports healthy response to post-exercise inflammation while Bio-Avail Collagen+ rebuilds your structural proteins—creating a comprehensive approach to healthy aging that addresses both recovery and tissue regeneration.

What makes Bio-Avail Omega+ different from regular fish oil? Most omega-3 supplements only provide EPA and DHA. Bio-Avail Omega+ goes beyond with NovaSol® curcumin—the most bioavailable form of curcumin on the market—plus ThymoQuin® black seed oil for immune and metabolic support. This triple-action formula means you get comprehensive support for joints, mood, cognition, and healthy inflammation response in one convenient softgel.

It's like getting three powerful nutrients that support recovery and vitality in one product!

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

Third Party Lab-Tested

At Adapt Naturals, all of our products are third-party tested and validated, and we are always happy to share these results with customers. We want you to have full confidence that you’re getting exactly what you think you are with each purchase.

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Your Questions Answered

Mix one scoop (10g) into any hot or cold beverage. It dissolves completely clear with no taste, making it perfect for coffee, tea, smoothies, or plain water. For optimal results, take daily. You may notice benefits within 4-8 weeks of consistent use, with continued improvements over 3-6 months.

The term "grass-fed" is not regulated in supplements, meaning many companies can make this claim without verification. Our collagen is different—it'scertified by LIAF Control, a member of the American Grassfed Association. This certification guarantees that the cattle spent 100% of their lives on pasture, eating grass, with no hormones or antibiotics, and with full traceability back to the multigenerational, family source farms.Click hereto learn more about how we source our collagen.

Three key differences: 1) It's the only certified grass-fed collagen on the market; 2) It has a precise ~2 kDa molecular weight for optimal absorption and bioavailability; and 3) It contains a full 10-gram dose, which research shows is most effective for results. Plus, it's a clean-label product with absolutely no fillers, sweeteners, or additives.

The ~2 kDa molecular weight of our collagen peptides makes them more bioavailable and easier to digest. This means better absorption, reduced digestive discomfort, and greater efficacy. Our collagen also dissolves completely clear in liquids—no clumps or gritty texture—making it more pleasant to consume.

Bio-Avail Collagen+ is gluten-free, dairy-free, soy-free, and contains no added sugars, fillers, or artificial ingredients. However, it is derived from bovine sources, so it is not suitable for vegetarians or vegans.

While individual results vary, studies show benefits can be observed in different timeframes: improvements in skin elasticity within 4-8 weeks, joint comfort within 3-6 months, and exercise recovery benefits within 4-12 weeks. Consistency is key—daily use will yield the best results.

Research has shown that collagen peptides can significantly reduce appetite and subsequent meal energy intake compared to other proteins. This satiety effect is thought to be related to collagen's specific amino acid profile, which may influence hunger hormones and metabolic signals. Some studies showed a 20% reduction in food intake following collagen consumption.

Customer Reviews

Based on 31 reviews
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D
D.G.
Bio-Avail Collagen

Bio-Avail Collagen coupled with Bio-Avail Omega+ is helping me sleep better and also my gut. The combination seems to help my skin too. I will continue to use both!

T
Ted Spo
Great Collagen

Has def helped with my achy joints!

Hi Ted,

We’re so glad you’re enjoying it! Our Bio-Avail Collagen+ promotes joint comfort, skin hydration, tissue strength, just to mention a few of the benefits. It’s wonderful to hear you’re feeling the difference!

T
Tim Miller
Collagen

I have only been taking the Bio Collagen for a little over a month now and I have started noticing some changes. Some of my problem joints have gotten better and I have noticed my hair is getting stronger.

Hi Tim,

That’s fantastic news—thank you for sharing! Bio-Avail Collagen+ was formulated to dissolve easily and support the health of skin, hair, nails, and joints. We’re happy to hear you’re already noticing positive changes.

E
Erin Kelly
Dissolves perfectly

Seems expensive but is only one scoop for a serving, others are 3! Dissolves really nicely so none is left on the insides of the cup or glass.

Hi Erin,

We’re so glad you’re enjoying the texture and convenience! Bio-Avail Collagen+ provides a full serving of hydrolyzed collagen peptides, glycine, and hyaluronic acid to help support skin, hair, nails, and connective tissue—no fillers, no clumps. We wish you the best!

A
Andrea S.
Adapt Naturals is the best

We’ve tried a lot of supplements and vitamins but the Adapt Collagen+ is by far so superior. I feel great every day. And my husband has been using Adapt Omega and loves it. We are now using Adapt Mag to help with stress and a very relaxing sleep. All the Adapt products we’ve tried have worked great.

Hi Andrea,

This is such great feedback—thank you! Bio-Avail Collagen+ is designed for easy mixing and absorption, with hydrolyzed collagen peptides, glycine, and hyaluronic acid to support healthy connective tissue and skin. We’re so glad you and your husband are enjoying our Omega+ and Mag as well. It’s an honor to be part of your wellness toolkit!

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