Worried about the signs of aging? Don't worry, we have the solution. Collagen supplements are a great way to increase your body's natural production of collagen and help reduce the appearance of expression lines, wrinkles, and sagging skin.

Not only do these supplements help improve your appearance, but they also have several other health benefits. For example, collagen can help improve joint health, digestion, and sleep quality. So if you're looking for a way to look and feel your best, a quality collagen supplement is definitely the way to go!

In this article, we will discuss the benefits of collagen supplementation and highlight some of the best options on the market!

Why Collagen?

Collagen is the most abundant protein in our bodies, and it's responsible for a whole host of functions. It's a major component of our skin, hair, nails, bones, and joints, and it plays a role in wound healing and digestion.

Did You Know: Collagen is the glue that holds us together, quite literally. The word “collagen” comes from the Greek kolla, meaning “glue”.

Unfortunately, our collagen production starts to decline as we age, potentially resulting in collagen deficiency which can lead to wrinkles, joint pain, and other age-related problems. Fortunately, there's an easy way to boost your collagen levels: by taking a supplement of these vital proteins.

Collagen supplements are made from animal sources like bone broth or fish skin, and they're rich in the amino acids that our bodies need to produce collagen. In addition to increasing collagen production, these supplements can also help to improve skin elasticity, reduce inflammation, and promote gut health.

So if you're looking for a way to fight the signs of aging or improve your overall health, consider adding a collagen supplement to your diet.

Benefits Include:

  • Healthier Skin- As we age, our skin begins to show signs of wear and tear. Fine lines and wrinkles appear, and our skin loses its elasticity resulting in a compromised skin barrier and loose skin. But there may be a way to fight back against the effects of aging skin. Collagen is a protein that is found in our skin, and it plays an important role in keeping our skin firm and plump. Unfortunately, collagen production declines as we get older. However, studies suggest that using collagen in supplement form may help to reduce the appearance of wrinkles and improve skin elasticity.1
  • Healthy Hair and Nails- Just like the skin on our face, the health of our hair and nails is a reflection of our diet and lifestyle. And just like our skin, as we age we start to lose collagen, resulting in drier, thinner hair and nails that are more prone to breakage. Collagen is the main structural protein found in our skin, hair, and nails, so it's no surprise that taking a supplement with collagen can help to improve their condition. Small studies have shown that supplementation can lead to increased hair density and nail growth,2 as well as reduced brittleness.
  • Healthy Joints- Collagen provides the building blocks for cartilage, which is the rubbery tissue that cushions your joints and allows them to move smoothly. Without enough collagen, cartilage can break down, leading to joint pain and inflammation. When it comes to joint pain, studies have found that supplementing with various forms of collagen can help reduce stiffness and pain.3 If you’re considering trying a collagen supplement for joint pain relief, be sure to speak with your doctor first to see if it’s right for you.
  • Healthy Bones- As we age, our bones can become weaker and more brittle. This is due in part to a natural decline in collagen production. Collagen is a protein that helps to give bones their strength. It also plays an important role in bone formation. Supplementing with collagen can help to counteract the effects of aging by increasing bone formation and supporting healthy bone density. In one study, participants who took collagen peptides for 12 months experienced increased bone mineral density and reduced bone resorption4 (the process of breaking down old bone tissue). These results suggest that collagen supplementation may support collagen production and promote healthy bones as we age.
  • Healthy Gut- Collagen plays an important role in gut health. It helps to seal the spaces between our cells and provides structure to our GI tract. A healthy gut barrier is important for preventing bacteria and toxins from entering our bloodstream. Some research suggests that using collagen supplements can help treat leaky gut syndrome by sealing the spaces between cells in the gut lining. Although more research is needed to confirm these claims, collagen may be a promising treatment for leaky gut syndrome and other GI disorders.
  • Reduces Inflammation- One of collagen's many benefits is its ability to decrease inflammation.5 Studies have shown that collagen can help to reduce the symptoms of joint pain, arthritis, and inflammatory bowel disease. Additionally, collagen has been shown to boost the immune system and promote healing. So how does collagen achieve all of these impressive feats? Collagen is rich in proline, an amino acid that helps to reduce inflammation. Proline helps to support support collagen synthesis and repair tissue damage by encouraging cell growth. Additionally, proline helps to regulate the immune system by producing white blood cells. As a result, collagen is an important tool in the fight against inflammation.

Important Considerations

If you're considering taking a collagen supplement, there are a few things you should keep in mind:

  1. Side Effects- Collagen is generally well tolerated, but some people may experience mild gastrointestinal upset, headaches, dizziness, or insomnia.
  2. Allergies- People with allergies or dietary restrictions should be aware that collagen is derived from animal sources and may not be suitable for them.
  3. Kidney Stones- Finally, people with kidney stones should avoid using collagen supplements as they may increase the risk of stone formation.

However, overall, collagen supplements are safe for most people and can be a helpful way to support skin, hair, and nail health. So if you're looking for a way to turn back the clock and support your overall health and well-being, take a look at Our List of Mentions and consider adding a collagen supplement to your daily routine.

Collage of the 5 best collagen supplements specifically formulated to combat sagging skin.

Our List of Mentions

We all know that collagen supplements are important for keeping our skin looking young and healthy, but it can be hard to decide which product is right for you.

With so many collagen supplements on the market, it can be hard to decide which one is best for you. They all promise the world, but how do you know which one will actually deliver?

Not to worry, we've got you covered. We've done the research and compiled a list of the best collagen supplements for sagging skin. We've included our favorite products, as well as a brief description of why we love them.

We mention helpful products that we feel are useful for our readers. As an Amazon Associate, we may earn a commission on qualifying purchases from the links on this page if you decide to purchase something, at no cost to you. All opinions in this article are our own and reviews have been edited for length and clarity.

Top Mention

1. Best Collagen Powder

Garden of Life Grass Fed Collagen Peptides

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Collagen Source: Bovine Collagen Peptides

Collagen Type: I & III

Net Weight: 19.75 oz

Servings/ Container: 28

Why We Mention It

Looking for a beauty supplement that does it all? Introducing Garden of Life's Grass-Fed Collagen Peptides. This powerful collagen peptide powder helps promote skin elasticity, strong nails, and healthy hair, while also helping to reduce the signs of aging. Perfect for both men and women, it dissolves quickly and is soluble in hot or cold liquids. You can add it to your favorite smoothie, shake or mix it with water or almond milk. Or, get creative and use it in baking recipes. Morning, afternoon, or evening, Garden of Life's Grass Fed Collagen Peptides are a great way to upgrade your favorite beverage. And, it comes with a scoop included for your convenience. Garden of Life only uses clean, traceable, and third-party-certified collagen peptides in its products. So you can trust that you're getting the highest quality product available. Check out all the different ways Garden of Life collagen powders can support your health and wellness needs today!

Customer Reviews: Most customers are amazed by the results they have seen from consuming this natural collagen powder. The majority say the tasteless powder can easily be mixed with any drink and has reportedly improved their hair, nails, skin, and joints. Virtually everyone is impressed by the fact that the collagen is sourced from grass-fed, pasture-raised cows, which gives them confidence in its quality and nutritional value.

What We Should Mention

Garden of Life's Grass Fed Collagen Peptide powder is sourced from cows that are pasture raised to a strict standard and are third-party Non-GMO Tested by iGEN, Certified Gluten-Free by NSF, and Certified Keto & Paleo by the Paleo Foundation. With 1.5 Billion CFU probiotics for digestion, these collagen peptides are hydrolyzed with enzymes that break down the collagen into its amino acids for best absorption from the digestive tract into the bloodstream. USDA Organic and made in the USA from foods grown in the USA and other countries, their peptides are free from antibiotics, hormones, or GMOs.

🟢 Pros:

  • Contains 18 grams of protein
  • Contains 1.5 billion CFU probiotics for digestion
  • Tasteless
  • Third-party Non-GMO tested

❌ Cons:

  • Some people say it doesn't dissolve well in liquids

2. Best Collagen Capsules

Dr. Emil Nutrition Multi-Collagen Plus

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Collagen Source: Bovine, Chicken, Eggshell, & Marine Collagen Peptides

Collagen Type(s): I, II, III, V, & X

Capsules/ Bottle: 90

Servings/ Bottle: 30

Why We Mention It

Do you want to turn back the hands of time? To feel young and vibrant again? Then you need Dr. Emil Nutrition's Multi-Collagen Plus. This unique blend of hydrolyzed collagen peptides from grass-fed bovine, chicken, eggshell, and marine sources is designed to support optimal hair, skin, nails, joints, and gut health. Collagen is the key to a youthful appearance, and these capsules are the most convenient way to get your daily dose. Just take them with water - no messy powder to deal with. And because they're easy to digest, these collagen peptides are readily absorbed by the body for maximum benefit. So don't wait another day - start feeling young again with Dr. Emil Nutrition's Multi-Collagen Plus!

Customer Reviews: Customers of Dr. Emil's Multi Collagen Plus capsules have reported positive changes to their skin, nails, hair growth, and pain relief. Many users said they prefer it over other brands since one capsule contains all the necessary types of collagen, eliminating the need to take multiple pills. The majority of those consistent with taking the concentrated dosage report that it has helped them see results in as little as a couple of weeks.

What We Should Mention

This doctor-derived formula is made with the highest quality ingredients and manufactured in a cGMP facility. Plus, it's gluten-free, non-GMO and 100% free of hype, hormones, and empty promises. Made in the USA, this supplement is designed to support healthy skin, hair & nails, joint health, and digestive health. So if you're looking for a supplement that can help you look and feel your best, try Dr. Emil Nutrition Multi-Collagen Plus today!

🟢 Pros:

  • 100% Grass-fed sources
  • Easy to swallow capsules for fast results
  • Fast-absorbing formula
  • Certified gluten-free and Non-GMO

❌ Cons:

  • Not for people with known allergies to shellfish

3. Best For Hair, Skin, and Nails

Reserveage Nutrition Tres Beauty 3

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Collagen Source: Bovine Collagen Peptides

Collagen Type(s): I & III

Capsules/ Bottle: 90

Servings/ Bottle: 30

Why We Mention It

Reserveage Nutrition's Tres Beauty 3 is a beauty supplement that covers all the bases! This unique formula includes collagen, hyaluronic acid, and keratin to support skin hydration, strong and lustrous hair, and healthy nails. Plus, it also has biotin and beautifying B vitamins to give you an all-around boost of beauty nutrients. So whether you're concerned about wrinkles, dryness, or brittle nails, Tres Beauty 3 is here to help. Why settle for anything less than the best for your beauty routine? Reserveage Nutrition's Tres Beauty 3: Because you're worth it.

Customer Reviews: Customers who have tried the Tres Beauty 3 collagen capsules have reported positive results after taking the product during the first few months of use. They've stated that the product has improved the strength and growth of their nails, as well as the overall appearance of their skin. Users have received compliments on their brighter and more youthful-looking skin, and attribute it to the daily use of Tres Beauty 3 collagen capsules. Overall, customers highly recommend this product to others.

What We Should Mention

Looking for a beauty supplement that can help you achieve radiant skin, lustrous hair, and strong nails? Reserveage Nutrition's Tres Beauty 3 may be perfect for you! This unique formula comes complete with collagen, keratin, and biotin to support your overall beauty.

The addition of hydrolyzed collagen types I-III provides essential amino acids that help to support healthy connective tissue and joint function. This makes Reserveage Nutrition Tres Beauty 3 not only good for your outward appearance but also your overall health.

Plus, it's gluten-free and made with organic ingredients, so you can feel good about taking it. Simply take three capsules daily to enjoy the benefits.

🟢 Pros:

  • Contains elastin to firm the skin
  • Contains hyaluronic acid to hydrate the skin
  • Easy to swallow capsules
  • Gluten-free

❌ Cons:

  • Can be expensive for long-term use

4. Best For Vitality

Vital Vitamins Multi Collagen Complex

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Collagen Source: Bovine, Chicken, Eggshell, & Marine Collagen Peptides

Collagen Type(s): I, II, III, V, & X

Capsules/ Bottle: 150

Servings/ Bottle: 50

Why We Mention It

Looking for a way to keep your skin looking young and radiant? Try Vital Vitamins Multi Collagen Complex capsules! This unique blend of collagen-boosting compounds will help keep your skin elastic and hydrated. With just a recommended dose of 3 capsules per day, you can enjoy the benefits of healthy hair, skin, and nails. Take them with you wherever you go in a convenient handbag or pocket-size bottle. Don't let age get in the way of looking and feeling your best! Try Vital Vitamins Multi Collagen Complex today.

Customer Reviews: Many customers report noticing improvements in their skin, hair, and nails after taking Multi Collagen Complex for a few months. Some users even reported relief from joint and knee pain. This capsule form of collagen supplement was also preferred over the unpleasant taste of similar powder versions. Overall, customers have been pleased with the results of this product.

What We Should Mention

Vital Vitamins Multi Collagen Complex capsules are ethically sourced from pure, non-GMO, grass-fed, pasture-raised, hormone-free, and cruelty-free sources. They're also free of gluten, wheat, yeast, artificial ingredients, and preservatives. Plus, this collagen complex is specially formulated to provide you with a safe and potent way to support your overall health. As we age, our bodies produce less collagen, so supplementing with Vital Vitamins Multi Collagen Complex can help keep you looking young and beautiful.

🟢 Pros:

  • All-in-one collagen supplement
  • Digestive enzyme blend for easy absorption
  • Non-GMO, Gluten-free, dairy-free
  • Manufactured in a GMP Certified Laboratory

❌ Cons:

  • Not for people with known fish allergies

5. Best For Any Budget

Hello Lovely Collagen Peptides

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Collagen Source: Bovine, Chicken, Eggshell, & Marine Collagen Peptides

Collagen Type(s): I, II, III, V, & X

Capsules/ Bottle: 60

Servings/ Bottle: 20

Why We Mention It

Looking for a powerful collagen supplement that can help support your overall health and beauty? Look no further than Hello Lovely Collagen Peptides. This unique blend of five different types of collagen can help support healthy skin, hair, and nails. Plus, the hydrolyzed peptides are easily absorbed by the body for maximum benefits. Whether you want to improve your overall appearance or ward off the signs of aging, Hello Lovely Collagen Peptides can help. Give it a try today and feel the difference!

Customer Reviews: Customers are wild about Hello Lovely Multi Collagen capsules, stating that it has significantly helped them with managing joint pain, and has improved their skin and hair. They appreciate the ease of use and the affordable price, and consider the product highly effective. Overall, the majority feel Hello Lovely Multi Collagen capsules are a great choice for those looking to prioritize their joint and skin health without having to break the bank.

What We Should Mention

These capsules are sourced from the highest quality ingredients and third-party lab-tested for purity and quality. Each ingredient is hand-picked and the result of years of research. Hello Lovely Collagen Peptide capsules are bottled in the USA following strict cGMP guidelines and are certified for safety. Pregnant or nursing mothers, children under the age of 18, and individuals with a known medical condition should consult a physician before using this supplement.

🟢 Pros:

  • Complete blend of collagen proteins
  • No artifical colors
  • Non-GMO, Gluten-free, dairy-free
  • Third party lab certified

❌ Cons:

  • Not for people with known fish allergies

Honorable Mentions

Although these products didn't make it to the top of our list this time around, they still deserve credit for coming close. Each has favorable reviews from thousands of customers, proving that there's something special about them. So don't dismiss these items just because we haven't mentioned them yet; give them a chance and see why so many other people are glad they did!


Vital Proteins Collagen Peptides


Live Conscious Collagen Peptides


NeoCell Super Collagen with Vitamin C


Smiling woman with gray hair holding a glass of water while taking a collagen supplement in a convenient capsule form.

Tips Worth Mentioning

We all know that collagen supplements offer a wide range of benefits, but it can be hard to know which type to choose and how to use them safely.

Not all collagen peptide supplements are created equal. With so many on the market, it can be hard to know which one is right for you. And if you're not using them correctly, you might not be getting the full benefits they offer.

We've put together a list of tips we feel are worth mentioning when choosing the best collagen supplements to improve your skin health. We include which types of collagen are best, what to look for, and how to safely use them as recommended by experts.

Know What To Look For

If you’re seeking collagen supplements for sagging skin and can’t decide the best one for you, don’t worry - there are a few key points to consider.

1) Variety

When it comes to variety, there is no one-size-fits-all solution since there are many ways to use collagen supplements. What works for someone else may not be the best option for you.

  • Powder- Collagen powders come in a variety of flavors and can be easily mixed into smoothies or other drinks.
  • Capsules- Collagen capsules are the most convenient option because they are easy to take on the go without the fuss of cleaning up.
  • Liquid- Liquid collagen is absorbed quickly and easily by the body for maximum benefits, however, many products require refrigeration which is not always convenient.
  • Gummies- A collagen gummy offers a tasty way to get your daily dose of collagen without having to swallow pills or mix powders.

2) Form

Explore which forms are offered by a particular brand so you can find one that fits your specific needs and your lifestyle easily.

  • Collagen Peptides- This is the most common form of collagen typically found in supplements because it has already been broken down for better absorption.
  • Gelatin- Partially hydrolyzed collagen, or gelatin, is a protein substance derived from collagen that has been processed but only dissolves in hot water. Foods containing gelatin such as bone broth provide us with dietary collagen, which can have many benefits for our health including gut health, joint pain relief, and skin elasticity.
  • Raw or Undenatured Collagen- Collagen comes in a raw, or undenatured form, such as UC-II collagen, which is commonly used for joint pain relief.

3) Type

Make sure to look at the type of collagen present in the supplement - some collagens have different properties that target specific concerns.

Out of the 28 types of collagen,6 these four are the most common:

  • Type I- Is the most common type of collagen in the body and is important for skin, hair, and nails.
  • Type ll- Is found in the joints and can help support comfort and mobility.
  • Type lll- Is found in the intestines, muscles, and vessels, and can help hydration.
  • Type lV- Is important in wound healing and in embryogenesis (the transformation of an embryo into a fetus).

For a glowing complexion, lustrous locks and strong nails turn to type I & III collagen supplements. Joint health? Type II is your go-to source!

Some supplements may even contain type V and type X, which are beneficial for healthy muscles, lungs, liver, and bones.

4) Ingredients

Check the ingredients in the product. Find something with natural ingredients and no added chemicals.

Did You Know: Digestive enzymes break down the collagen in food into smaller pieces. But collagen in supplements has already been broken down, or hydrolyzed, which is why it’s thought to be absorbed more efficiently than collagen from foods.

Collagen supplements are a popular way to boost your body's natural collagen production and help improve skin, hair, nails and more. However, if you have allergies to fish or eggs it might be best for you to avoid marine collagen peptides or eggshell-derived sources and try bovine collagen peptides instead as they can cause unwanted reactions in some people.

Additionally, these particular types of supplement may also lower blood sugar levels so if you're taking medication - including insulin, metformin, or glyburide - then always check with your healthcare professional first about potential interactions between the two.

When To Take

If you're searching for the ideal time to add collagen to your wellness routine, there are a few things to consider. In regards to digestive or gut issues, it's recommended that taking collagen on an empty stomach or with meals can be beneficial in the morning. For improved sleep quality, experts suggest supplementing at night before bedtime!

Smiling older woman touching her face with a youthful glow since using collagen supplements for younger looking skin.

Did We Mention

Collagen For Sagging Skin FAQs?

Collagen supplements are all the rage right now, but there is so much conflicting information out there about them.

It can be hard to figure out what collagen supplement is best for you, what dosage you should take, and whether or not they even work.

We've gathered everything you need to know about collagen supplements for sagging skin in this comprehensive buyer's guide of frequently asked questions. From which form of collagen is best to how often should you be taking it, we have you covered.

What is the difference between collagen and collagen peptides?

Collagen is a protein naturally produced in our bodies, vital for maintaining the structure and elasticity of skin. In contrast, collagen peptides, often used as a supplement, are collagen molecules that have been broken down into smaller, easily digestible fragments. Peptides are short chains of amino acids, the building blocks of proteins, while polypeptides are longer chains of these amino acids. The term "polypeptide for skin" refers to these long chains utilized in skincare products to support collagen production, thereby improving skin health.

Can collagen help with crepey skin?

Yes, collagen can help with crepey skin. Crepey skin is a common sign of aging skin and occurs when the skin becomes thinner and loses its elasticity. This can be caused by various factors such as genetics, sun exposure, and lifestyle choices like smoking and poor nutrition.

Collagen helps to promote skin elasticity and firmness, which can improve the appearance of crepey skin.

Does collagen help sagging jowls?

Absolutely! Collagen plays a key role in keeping the skin tight and firm, which can help reduce the appearance of sagging jowls. As we age, our collagen production decreases, leading to sagging skin and neck wrinkles. By supplementing with collagen, we can help support our body's natural production of this essential protein and promote firmer, more youthful-looking skin.

Does collagen tighten saggy skin?

Yes, collagen can help tighten saggy skin. Collagen is a protein that helps promote skin elasticity, which is why it's often used in anti-aging skincare products. Increased collagen production can help fill in wrinkles and lines, and may also help improve skin tone and texture. While collagen supplements won't completely erase the signs of aging skin, they can certainly help make a noticeable difference.

Which type of collagen is best for sagging skin?

Type I collagen is usually considered best for the skin. It's the most abundant type of collagen in the body and is found in the skin, bones, and tendons.

Type III collagen is also important for the skin. It helps to keep the skin hydrated and can prevent smile lines, crow's feet, and forehead wrinkles from forming. The best collagen supplements typically contain a blend of type I and type III collagen.

What is the best form of collagen to take?

There are a few different types of collagen, but the best type to take is hydrolyzed collagen. This is because it's a pre-digested form of collagen that is easy for your body to absorb and use. Hydrolyzed collagen or collagen peptides typically contain all essential amino acids.

How long does it take for collagen to tighten skin?

It depends on the person. But typically, it takes around 6 to 12 weeks of regular collagen consumption to tighten skin. Collagen helps to fill in wrinkles and lines while promoting healthy skin cell production. So, if you're looking for a more youthful appearance, adding collagen to your healthy diet is a great way to achieve it.

Is it okay to have collagen powder every day?

Yes, collagen powder is a healthy way to add protein and other nutrients to your daily diet. Collagen is the most abundant protein in the body and helps form connective tissues such as skin, hair, nails, and bones. It's also a good source of amino acids, which are the building blocks of protein.

How much collagen should a 55-year-old woman take daily?

There is no set answer to how much collagen per day a 55-year-old woman needs since this will vary depending on her circumstances. However, experts generally recommend 3–10 grams per day as a good ballpark estimate.

Is it too late to start taking collagen?

No, it's never too late to start using collagen. Collagen supplements are becoming more and more popular as people learn about their many health benefits. So If you're not already taking a collagen supplement, there's no time like the present to start!

The Final Mention

You’re not alone in your collagen journey. Millions of Americans are on the hunt for the top collagen supplements to keep their skin looking hydrated, plump, and youthful.

With our helpful list of the best supplements out there, you’ll be able to make an informed decision about which one is right for you and your budget.

So what are you waiting for? Try one of our top 5 picks from Our List of Mentions today!

Thank You For Reading- We Hope You Found Exactly What You Were Looking For!

#1 Best Collagen Powder

Garden of Life Grass Fed Collagen Peptides

#2 Best Collagen Capsules

Dr. Emil Nutritian Multi-Collagen Plus

#3 Best For Hair, Skin, and Nails

Reserveage Nutrition Tres Beauty 3

#4 Best For Vitality

Vital Vitamins Multi Collagen Complex

#5 Best For Any Budget

Hello Lovely Collagen Peptides

✅ 6 Sources

HealthMention only uses sources from authoritative and reliable resources, such as peer-reviewed studies, to strengthen the accuracy of our content.

  1. Bruyere O, Zegels B, Leonori L, Janssen A, Bourges C, Reginster JY. Effect of collagen hydrolysate in articular pain: a 6-month randomized, double-blind, placebo controlled study. Complement Ther Med. 2012; 20(3):124-30.
  2. Hexsel D, Zague V, Schunck M, Siega C, Camozzato FO, Oesser S. Oral supplementation with specific bioactive collagen peptides improves nail growth and reduces symptoms of brittle nails. J Cosmet Dermatol. 2017;16(4):520-526. doi:10.1111/jocd.12393
  3. Bello AE, Oesser S. Collagen hydrolysate for the treatment of osteoarthritis and other joint disorders: a review of the literature. Curr Med Res Opin. 2006;22(11):2221-2232. doi:10.1185/030079906X148373
  4. König D, Oesser S, Scharla S, Zdzieblik D, Gollhofer A. Specific Collagen Peptides Improve Bone Mineral Density and Bone Markers in Postmenopausal Women-A Randomized Controlled Study. Nutrients. 2018;10(1):97. Published 2018 Jan 16. doi:10.3390/nu10010097
  5. Schwarz D, Lipoldová M, Reinecke H, Sohrabi Y. Targeting inflammation with collagen. Clin Transl Med. 2022;12(5):e831. doi:10.1002/ctm2.831
  6. Ricard-Blum S. The collagen family. Cold Spring Harb Perspect Biol. 2011;3(1):a004978. Published 2011 Jan 1. doi:10.1101/cshperspect.a004978
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