Best Collagen Supplements: Types, Benefits, and What to Look For

The collagen supplements with the most skin research behind them are hydrolyzed collagen peptides. A 2023 meta-analysis in Nutrients found no significant difference between collagen sources for skin elasticity (Pu et al.), and a 2019 review in the Journal of Drugs in Dermatology (Choi et al.) reported improvements in skin elasticity and hydration. This guide compares brands by peptide quality, purity, and pricing per gram.

Medically reviewed by Matthew Olesiak, MD, on September 24, 2026.

This article is for informational purposes only and does not constitute medical advice. Consult your physician before starting any supplement regimen.

Collagen is the most abundant protein in the human body, making up about 30% of your total protein (Cleveland Clinic). Production declines with age, and women see a significant drop after menopause. That decline shows up in your skin, joints, bones, and gut. The right collagen supplement can help offset some of that loss, but the market is flooded with options, and not all of them are worth your money. (see collagen supplementation research) (see collagen supplement evidence)

Below, you’ll find a clear breakdown of collagen types, what the science actually says about benefits, who stands to gain the most from supplementation, and exactly what to look for (and avoid) on the label. If you’re ready to compare specific products, check out our verified collagen supplement reviews.

What Is Collagen and Why Does It Matter?

Collagen is a structural protein that acts as a scaffold for your skin, bones, tendons, ligaments, and gut lining. Think of it as the glue holding your body together. Your body makes collagen naturally from amino acids (primarily glycine, proline, and hydroxyproline), but that production slows with age, UV exposure, smoking, and poor diet.

According to the American Academy of Dermatology, women’s skin loses about 30% of its collagen during the first five years of menopause.

Collagen supplements deliver pre-broken-down amino acids (called peptides) that your body can absorb and use to support its own collagen-building processes. But there are different types, different sources, and real differences in quality. Let’s break it all down.

The Three Main Types of Collagen (and When to Use Each)

The collagen family has 28 members (Ricard-Blum, 2011), and three of them come up most often in supplements. Each type serves a different function, and knowing the difference helps you pick the right supplement for your goals.

Type I Collagen: Skin, Hair, Nails, and Bones

Type I makes up 90% of your body’s collagen and gives structure to skin, bones, tendons, and ligaments, according to Cleveland Clinic. If your main concern is skin elasticity, wrinkle reduction, hair thickness, or bone strength, Type I is what you want.

Most bovine (cow-derived) and marine (fish-derived) collagen supplements are rich in Type I. A 2014 study by Proksch et al. in the journal Skin Pharmacology and Physiology randomized 69 women aged 35 to 55 to collagen peptides (2.5 g or 5 g) or placebo for 8 weeks. Skin elasticity improved in both collagen groups compared with placebo.

Type II Collagen: Joint Cartilage and Flexibility

Type II collagen is the main structural component of cartilage. If you have joint stiffness, osteoarthritis, or you’re an active person dealing with wear-and-tear on your knees, hips, or shoulders, Type II is the one to prioritize.

Lugo et al. published a 2016 study in the Nutrition Journal in which 191 volunteers with knee osteoarthritis took undenatured Type II collagen (UC-II), glucosamine plus chondroitin, or placebo for 180 days. The UC-II group had a significantly larger drop in total WOMAC score than both other groups. Two of the three authors worked for InterHealth Nutraceuticals.

Chicken-derived collagen is the richest source of Type II. You’ll often find it in joint-specific formulas.

Type III Collagen: Blood Vessels, Organs, and Gut

Type III collagen works alongside Type I in your skin, blood vessels, and intestinal lining. It’s important for cardiovascular health and gut integrity. Bovine collagen is the best source for Type III, as it naturally contains both Type I and Type III together.

Evidence for gut benefits is thin. A 2022 study in JMIR Formative Research (Abrahams et al.) had no placebo group: 14 of 40 women finished 8 weeks of collagen peptides, and 13 of those 14 reported fewer digestive symptoms, including bloating.

Collagen Types Comparison Table

Type	Found In	Best For	Top Sources
Type I	Skin, bones, tendons, ligaments	Skin elasticity, wrinkles, hair, bone density	Bovine, marine (fish)
Type II	Cartilage	Joint pain, osteoarthritis, flexibility	Chicken (sternum cartilage)
Type III	Muscles, arteries, organs	Usually sold together with Type I	Bovine

Collagen Sources: Marine vs. Bovine vs. Chicken

The animal source of your collagen matters more than most brands want you to think. Each source has real advantages and limitations.

Marine Collagen (Fish)

Marine collagen comes from fish skin and scales, primarily cod, pollock, or snapper. It’s almost entirely Type I collagen with smaller peptide molecules, which means faster absorption. Marine collagen peptides tend to have smaller molecular weight than bovine collagen, which may support faster absorption in the gut.

Marine collagen is the best choice if your primary goal is skin health. It’s also a good option for people who avoid beef or pork for religious or dietary reasons. The downside: marine collagen is typically more expensive, and some products carry a faint fishy taste (though the best tasteless collagen powders on the market, like those from Vital Proteins and Orgain, have solved that problem).

Bovine Collagen (Cow)

Bovine collagen is sourced from cowhide and bones. It provides both Type I and Type III collagen, making it the most versatile single-source option. It’s ideal if you want skin, bone, AND gut support in one product. Bovine collagen is also the most affordable option per gram.

Look for grass-fed, pasture-raised sourcing. This isn’t just marketing. Grass-fed, pasture-raised cattle are generally raised without antibiotics or added hormones, and many consumers prefer this sourcing for overall quality reasons.

Chicken Collagen

Chicken collagen (from sternum cartilage) is the primary source of Type II collagen. If joint health is your main concern, this is the source to look for. Most UC-II (undenatured Type II collagen) supplements come from chicken.

You’ll rarely find chicken collagen sold on its own as a powder. It’s more common in capsule-based joint formulas or multi-collagen blends.

Hydrolyzed Collagen Peptides vs. Gelatin vs. Undenatured Collagen

This is where most buyers get confused, and it’s one of the most important distinctions.

Hydrolyzed Collagen Peptides

Hydrolyzed collagen has been broken down into small peptides through enzymatic processing. These small peptides dissolve in hot or cold liquids and are the form used in most of the skin trials cited on this page.

A 2015 study by Asserin et al. in the Journal of Cosmetic Dermatology ran two placebo-controlled trials of collagen peptides. Skin hydration rose significantly after 8 weeks, and collagen density in the dermis increased after 4 weeks. One author works for Rousselot, a collagen maker.

Gelatin

Gelatin is partially hydrolyzed collagen. It dissolves only in hot liquid and gels when cooled (that’s what makes Jello jiggle). Same amino acids as hydrolyzed collagen, but larger molecules mean slower absorption. Gelatin works great in cooking (bone broth, gummies, baked goods) but isn’t practical for daily supplementation in drinks.

Undenatured (Native) Type II Collagen

This is a special case. Undenatured Type II collagen (UC-II) hasn’t been broken down at all. It works differently from peptides: instead of providing building blocks, it trains your immune system to stop attacking your own cartilage (a process called oral tolerance). Its evidence is for joint health, in the Lugo trial above.

What the Research Actually Says About Collagen Benefits

I want to be honest about what’s well-supported and where the evidence is still developing. Here is where the clinical data stands.

Skin Elasticity and Hydration: Strong Evidence

This is collagen’s strongest area of research. A 2021 systematic review and meta-analysis by de Miranda et al. in the International Journal of Dermatology analyzed 19 randomized controlled trials with 1,125 total participants. Collagen improved skin hydration, elasticity, and wrinkles compared with placebo, and the authors concluded that 90 days of hydrolyzed collagen reduced signs of skin aging.

Proksch et al. (2014, Skin Pharmacology and Physiology) found that 2.5g of collagen peptides daily for 8 weeks reduced eye wrinkle volume by 20% in 114 women ages 45-65. Kim et al. (2018, Nutrients) showed 1,000mg of low-molecular-weight collagen improved skin hydration at 6 weeks and wrinkle depth at 12 weeks in 64 women ages 40-60.

Joint Health: Good Evidence

Zdzieblik et al. (2017, Applied Physiology, Nutrition, and Metabolism) studied 139 young athletes with knee pain during sport. After 12 weeks, the collagen peptide group reported significantly less activity-related knee pain than the placebo group and used fewer additional treatments.

For osteoarthritis specifically, the Lugo et al. (2016) trial mentioned earlier showed UC-II outperformed glucosamine plus chondroitin in reducing WOMAC scores over 180 days. For more on supporting joint health through diet, see our guide on best foods for gut health, since inflammation and gut integrity affect joints too.

Bone Density: Promising but Early

Konig et al. (2018, Nutrients) randomized 131 postmenopausal women (average age 64) with reduced bone density to collagen peptides or placebo for 12 months. Bone density in the spine and femoral neck rose significantly in the collagen group compared with placebo. The bone formation marker P1NP rose in the collagen group, while the breakdown marker CTX 1 rose in the placebo group.

This is encouraging, but we need more large-scale trials before drawing firm conclusions. Collagen supplementation should complement, not replace, calcium, vitamin D, and weight-bearing exercise for bone health.

Gut Health: Preliminary Evidence

A 2017 lab study by Chen et al. in Food & Function found that fish-skin collagen peptides reduced damage to the tight junction proteins ZO-1 and occludin in intestinal cells grown in a dish. That is a cell study, not a human trial.

The 2022 human study (Abrahams et al., JMIR Formative Research) was small and had no placebo group, so it cannot show that collagen heals the gut. More human trials are needed here. If gut health is a priority, collagen may be a helpful addition alongside foods that support gut health and proper nutrition.

Who Benefits Most from Collagen Supplements?

Collagen isn’t a magic fix for everyone. Based on the research, these groups stand to gain the most:

Adults over 50. Collagen production drops with age. In a 2006 study in the American Journal of Pathology (Varani et al.), skin cells from people over 80 made less type I procollagen than cells from people aged 18 to 29.

Post-menopausal women. Skin loses about 30% of its collagen in the first five years of menopause, per the AAD. The Konig et al. (2018) bone density study specifically targeted this population and found measurable benefits at 12 months.

Active adults and athletes. The Zdzieblik et al. (2017) study found less activity-related knee pain in young athletes. If you also take creatine, see can you take collagen and creatine together.

People with early signs of skin aging. Skin hydration and elasticity are the best-studied outcomes, as the meta-analyses above show. You might also consider pairing collagen with a quality topical product. See our wrinkle cream reviews for options that work from the outside in.

Individuals with joint pain or osteoarthritis. Both hydrolyzed collagen and UC-II have clinical support for reducing joint pain and stiffness.

What to Look for in a Collagen Supplement

Not all collagen products deliver what they promise. Here’s my checklist for evaluating any collagen supplement, whether it’s a powder, capsule, or liquid.

1. Third-Party Testing

This is non-negotiable. Look for NSF International, USP, or Informed Sport certification on the label. Third-party testing confirms the product actually contains what it claims and screens for heavy metals, pesticides, and contaminants. Independent testing labs like ConsumerLab have found that some collagen supplements contain less collagen than advertised or carry heavy metal contamination, which is why third-party certification matters.

2. Source and Type

Match the collagen type to your goal:

• Skin, hair, nails, bones: Type I (marine or bovine)
• Joints: Type II (chicken) or hydrolyzed collagen at higher doses
• General wellness: Type I + III blend (bovine)
• Multi-purpose: Multi-collagen blend (all three sources)

For source quality, look for grass-fed/pasture-raised bovine or wild-caught fish. Avoid products that don’t disclose their collagen source at all.

3. Amounts Used in Studies

The trials on this page used 2.5 g or 5 g a day for skin (Proksch 2014), 5 g a day for knee pain and bone density (Zdzieblik 2017, Konig 2018), and 40 mg a day of UC-II for knee osteoarthritis (Lugo 2016). Compare a product’s serving with the amounts used in the research it cites, and ask your doctor what fits you.

4. Added Vitamin C

Your body needs vitamin C to make collagen (Cleveland Clinic), and a 2017 review in Nutrients (Pullar et al.) describes vitamin C stimulating collagen synthesis in skin. Some collagen supplements include vitamin C in the formula.

5. Minimal Additives

The cleanest collagen supplements contain one ingredient: hydrolyzed collagen peptides. Watch out for added sugars, artificial sweeteners, fillers, and unnecessary flavoring. Flavored varieties are fine if you prefer them, but check the sugar content.

6. Molecular Weight

Look for products that say “hydrolyzed” or “collagen peptides” on the label. This is especially relevant if you want a tasteless powder that dissolves cleanly in coffee or water.

Red Flags to Avoid in Collagen Products

Watch for these warning signs:

• No third-party testing mentioned anywhere. If a brand doesn’t test independently, assume they have something to hide.
• Proprietary blends that hide individual doses. You should know exactly how many grams of each collagen type you’re getting.
• Outrageous health claims. Any product claiming to “reverse aging” or “rebuild your joints in days” is selling hype, not science.
• Undisclosed collagen source. If the label just says “collagen” without specifying bovine, marine, or chicken, move on.
• Extremely cheap pricing. Quality collagen from grass-fed bovine or wild-caught fish costs money to produce. A price far below similar products is worth questioning.
• Added hormones or unnecessary ingredients. Collagen doesn’t need added hormones, and many extras (like biotin at mega-doses) are marketing tactics, not science-backed additions.

How to Take Collagen for Best Results

Timing

There’s no single “best time” to take collagen. The clinical studies showing benefits did not specify strict timing. That said, taking collagen on an empty stomach (morning, before breakfast) may improve absorption since it won’t compete with other proteins for uptake. Some people prefer adding it to their morning coffee or smoothie, which works just fine.

A small 2017 study by Shaw et al. in the American Journal of Clinical Nutrition (8 healthy men) found that vitamin C-enriched gelatin taken 1 hour before exercise doubled a blood marker of collagen synthesis. It measured a marker, not joint pain.

Consistency Matters More Than Timing

The skin trials cited here ran from 8 weeks to 12 months, and the de Miranda meta-analysis concluded that 90 days of use reduced signs of skin aging. Collagen isn’t something you’ll feel working overnight. If you skip days regularly, you’re unlikely to see the benefits the research describes.

Pair with Vitamin C

Vitamin C is one of the nutrients your body needs to form collagen (Cleveland Clinic). Food sources include oranges, strawberries, bell peppers, and broccoli.

Stay Hydrated

Collagen for Skin and Joints: A Dual Approach

Many people over 50 deal with both skin changes and joint discomfort at the same time. The good news is you don’t always need separate products. Bovine hydrolyzed collagen supplies Type I and Type III collagen.

Some brands sell products that combine hydrolyzed collagen with UC-II. If you want to compare specific formulas, see the options in our verified collagen supplement reviews section.

And don’t overlook what you put on your skin alongside what you take internally. Collagen supplements address skin structure from the inside, while topical products target the surface. Pairing an oral supplement with a proven topical can produce faster visible results. Browse our dark spot remover reviews if uneven skin tone is part of your concern.

The Best Collagen Multivitamin: Does It Exist?

Some products combine collagen with a multivitamin formula, and this category is growing fast. The idea is appealing, but there are trade-offs.

The main issue is the amount. Compare the collagen per serving on a multivitamin-collagen label with the amounts used in the trials above (2.5 g or more a day for skin).

Separate products make it easier to see how much of each you are getting. Check the label math carefully, and ask your doctor or pharmacist if you take other supplements or medicines.

Collagen peptides only work if your gut can absorb them. Bloating, low stomach acid, or a compromised gut lining can blunt how much hydrolyzed collagen actually reaches the bloodstream. Our guide on gut function and nutrient absorption explains how to set up the absorption side.

Frequently Asked Questions About Collagen Supplements

What is the best type of collagen to take?

It depends on your goal. Most skin research uses hydrolyzed collagen peptides (Choi et al., 2019; Pu et al., 2023). Undenatured type II collagen is sold for joint support; check the research behind the specific product before you buy.

How long does it take for collagen supplements to work?

In skin trials, changes in hydration and elasticity were measured over 2 to 12 weeks (Pu et al., 2023). In the König et al. (2018) study in postmenopausal women, bone mineral density was measured after 12 months. Daily consistency matters in both cases.

Can collagen supplements cause side effects?

A 2019 systematic review in the Journal of Drugs in Dermatology reported no adverse events in the collagen trials it included (Choi et al.). If you have a fish, shellfish, or egg allergy, check the collagen source carefully to avoid allergens.

Is marine collagen better than bovine collagen?

A 2023 meta-analysis in Nutrients found no significant difference between collagen sources for skin elasticity, although effects on skin hydration varied by source (Pu et al.). Neither marine nor bovine collagen is clearly better. Marine collagen suits people who avoid beef, and bovine powders are often cheaper.

Should I take collagen with food or on an empty stomach?

Either works. Taking it with food is fine, and some people find it easier on their stomach that way. The most important factors are taking it consistently every day and getting enough vitamin C, which the body uses to make collagen (Pullar et al., 2017).

How much collagen should adults over 50 take daily?

We do not give dosing advice. For reference, trials in the Choi et al. (2019) review used 2.5 to 10 grams of collagen hydrolysate per day, and the König et al. (2018) bone study in postmenopausal women used 5 grams per day. Check with your doctor first, especially if you take medications or have kidney concerns, since collagen adds to your total protein intake.

What should I look for in a collagen powder?

Five things: (1) third-party testing from NSF, USP, or Informed Sport, (2) clearly labeled collagen type and source, (3) the amount of hydrolyzed collagen per serving stated clearly, (4) minimal additives, fillers, and sugar, and (5) the inclusion of vitamin C or a note to pair with vitamin C. Avoid proprietary blends that hide dosages and products that don’t disclose their collagen source. For a full product comparison based on these criteria, visit our collagen supplement reviews category.

Bottom Line

Collagen supplementation isn’t a miracle fix, but the clinical evidence for skin, joint, and bone benefits is real and growing. The key is choosing the right type for your goals, using it consistently, and checking with your doctor first if you have a health condition.

Look for third-party tested products with clean ingredients, pair with vitamin C, and be skeptical of brands making exaggerated promises. If you’re over 50, post-menopausal, or dealing with joint discomfort, the research suggests collagen is one of the more evidence-backed supplements available today.

Ready to find the right collagen for you? Start with our verified collagen supplement reviews to compare products side by side, or explore Consumer Health Guide for more research-backed health and supplement guidance. You can also learn more about our review methodology to see how we evaluate every product.