Do Collagen Supplements Work? Benefits, Types, and How to Choose The Best Collagen

If you’ve ever wondered, do collagen supplements work, you’re not alone.

Some people swear by them for skin, joints, and gut health.

Others say collagen is a waste of money because “your body just breaks it down like any other protein.”

So what’s actually true?

As a registered dietitian, collagen is something I’ve used for years with clients—and something I personally consume daily. Like most things in nutrition, the answer isn’t black and white.

Collagen isn’t a magic fix. But it’s also not useless. When you understand how it actually works—and how to use it correctly—it can be a really helpful foundational tool.

So if you’ve been asking yourself, do collagen supplements work, this post will walk you through what actually matters.

What Is Collagen and Why Does It Matter (and Do Collagen Supplements Work?)

Collagen is the most abundant protein in your body, making up about 30% of total body protein (Shoulders & Raines, 2009).

It plays a structural role, helping support:

• skin
• joints
• bones
• hair and nails
• connective tissue

You can think of collagen as the framework that holds your body together.

Because of this, your body is constantly breaking collagen down and rebuilding it—which means it requires consistent nutritional support.

The Different Types of Collagen (and Why They Matter)

This is something most people never think about—but it actually helps explain why different collagen supplements exist.

There are multiple types of collagen in the body, but the most important ones are:

• Type I collagen → found in skin, bones, tendons (structure + strength)
• Type III collagen → found in skin, organs, blood vessels (elasticity + flexibility)
• Type II collagen → found in cartilage (joint cushioning and support)

Most collagen supplements you see (especially powders) contain Type I and Type III, which is why they’re often marketed for skin, hair, nails, and overall structural support.

Type II collagen is more specific to joint and cartilage health, and is often found in more targeted joint formulas.

So when choosing a collagen, it’s not just about taking collagen—it’s about which type and what goal you’re trying to support.

Why Collagen Production Declines

Your body’s natural collagen production begins to decline in your late 20s and continues as you age (Varani et al., 2006). Plus, modern diets have shifted away from collagen-rich foods.

Historically, humans ate animals nose-to-tail, consuming skin, cartilage, and connective tissue. Now, most people eat primarily muscle meat, which is much lower in collagen.

This combination of aging + dietary changes can contribute to:

• skin changes
• joint discomfort
• slower recovery
• changes in connective tissue integrity

Between eating less of it and making less of it, collagen becomes something your body needs more support with as you age.

(Varani et al., 2006)

How Your Body Makes Collagen (and What It Needs)

Your body doesn’t absorb collagen and directly use it. Instead, it breaks proteins down into amino acids and rebuilds collagen internally using:

• glycine, proline, hydroxyproline (amino acids)
• vitamin C
• adequate total protein

(DePhillipo et al., 2018)

Collagen Supplementation: Is It a Waste of Money?

This is usually where the question comes up: do collagen supplements work, or are they just expensive protein powders?

Another common argument against collagen is:

“It just gets broken down like any other protein.”

This is partially true—but incomplete.

Collagen is consumed as hydrolyzed collagen (collagen peptides). During digestion, some is broken down into amino acids, but research shows that certain di- and tripeptides (like Pro-Hyp and Gly-Pro-Hyp) are absorbed intact into the bloodstream (Iwai et al., 2005; Shigemura et al., 2009).

These peptides don’t just sit there—they may act as biological signals.

Research suggests they can:

• stimulate fibroblasts (collagen-producing cells)
• increase collagen and elastin synthesis
• support extracellular matrix integrity

(Zague et al., 2018; Choi et al., 2014)

Bottom line: collagen is not magic, but it is also not useless. It functions as both a protein source and a signaling compound.

So again—the answer to do collagen supplements work is yes, but only when you understand how to use them correctly.

Collagen Is Not a Complete Protein (How to Use It Correctly)

One of the biggest misconceptions is how collagen fits into your overall protein intake.

Collagen is an incomplete protein because it lacks tryptophan, an essential amino acid (WHO/FAO protein standards).

That means collagen as a supplement should not be your only protein source at a meal.

However, you can absolutely use collagen supplements strategically.

If you’re using collagen as part of your protein intake—especially if you don’t want to increase meat consumption—pair it with foods that contain tryptophan.

Examples include:

• lentils and beans
• pumpkin seeds
• eggs or fish
• complete protein powders

For context:

• 3 oz chicken → ~240 mg tryptophan
• 1 egg → ~90 mg
• 1 cup lentils → ~150–180 mg

(USDA FoodData Central)

Collagen works best as a protein booster, not a protein replacement.

How to Use Collagen Powder in Real Life

This is where collagen becomes practical.

I don’t use collagen to replace meals—I use it to fill in gaps.

For example:

• adding collagen to coffee or tea with a balanced breakfast
• mixing it into water or electrolytes when I start my day
• combining it with protein powder in smoothies

One tip: collagen blends easily, but in drinks like coffee or tea, I find about 2 tablespoons is the upper limit before it affects taste.

How to Get Collagen Naturally From Your Diet

Before relying on supplements, it’s worth looking at how to get collagen naturally from your diet.

This is something I emphasize with many of my clients—especially those dealing with gut health issues.

I often recommend cooking meats using moist-heat methods, especially for people working on gut health.

Part of the reason is cooking technique matters. Higher, dry-heat methods like frequent grilling or baking can lead to the formation of more inflammatory compounds, especially when foods are overcooked or charred.

But just as important—moist-heat methods are how we actually make tougher, more collagen-rich cuts of meat easier to eat and digest.

This includes things like:

• slow cooking
• braising
• stewing
• making bone broth

These methods:

✔ are gentler on digestion

✔ help break down connective tissue

✔ naturally release collagen and gelatin into the food

This is a big reason bone broth became so popular—it’s essentially a concentrated way to pull those nutrients out of the food and make them more accessible.

And for many people, especially those who don’t tolerate tougher cuts of meat well, this can be a really practical way to support both digestion and collagen intake at the same time.

Here’s my bone broth recipe.

Important Note for Gut Health

Gut health is not one-size-fits-all.

Some people—especially those with SIBO or histamine intolerance—may feel worse when consuming bone broth or collagen.

If you’ve ever taken collagen or bone broth and felt worse, that’s not random. That’s information.

And it’s usually a sign that your gut needs a more personalized approach.

This is exactly why I created my It Starts in the Gut® program. Because gut healing is not plug-and-play—and a blog can’t replace personalization.

What If You’re Vegetarian or Don’t Eat Animal Products?

Collagen is naturally found in animal products.

If you’re pescatarian, marine collagen is a good option. For example, Vital Proteins Marine Collagen is sourced from cod.

If you’re vegetarian or vegan, most “vegan collagen” supplements are actually collagen-supporting formulas, not true collagen.

Plants do not contain collagen.

These products may support collagen production, but they are not equivalent to collagen peptides and have less direct research (Choi et al., 2019).

How to Choose the Best Collagen Supplement (Based on Your Goals)

This is where most people get overwhelmed.

If you’ve decided that collagen could be helpful, the next question becomes: do collagen supplements work equally across all products? The answer is not all collagen is the same.

Step 1: Understand the Source

Marine collagen (fish)

→ mostly Type I with some Type III

→ best for skin, hair, nails

Bovine collagen (cow)

→ Type I + III

→ more full-body support

Step 2: Understand Bioactive Collagen Peptides (This Is Where It Gets More Specific)

Not all collagen peptides are the same.

Most collagen powders on the market are what I would call “general collagen peptides.”

They provide amino acids (glycine, proline, hydroxyproline) that your body can use to support collagen production overall.

That’s helpful—but it’s not targeted.

Bioactive collagen peptides are different.

These are specific peptide sequences that have been:

✔ studied in human trials

✔ shown to survive digestion

✔ absorbed into the bloodstream

✔ and interact with specific tissues (like skin, bone, or cartilage)

Examples include:

• Verisol® → skin elasticity + wrinkles
• Fortibone® → bone density + bone metabolism
• Fortigel® → cartilage + joint support

So instead of just “providing building blocks,” these peptides act more like signals—telling your body where to build and repair.

This is the key difference:

• General collagen = broad, foundational support
• Bioactive collagen = targeted, goal-specific support

(Clark et al., 2008; König et al., 2018)

Step 3: Choose Based on Your Goal (This is Where Most People Get It Wrong)

Most people choose collagen based on:

❌ what’s trending

❌ what someone else is taking

❌ what they saw on Instagram or the Tok

Instead, your choice should match your goal.

Here’s how to think about it:

✔ If your goal is general support

(skin, hair, nails, joints, overall protein support)

→ A standard collagen peptide is a great place to start

Examples:

• Vital Proteins – Collagen Peptides
• Vital Proteins – Marine Collagen

Think: daily foundational support

✔ If your goal is more targeted results

(skin, bone, joints, connective tissue)

→ Look for formulas that contain bioactive collagen peptides (clinically studied for specific outcomes)

• Designs for Health- Whole Body Collagen → contains Fortigel® (joint/cartilage support) → Fortibone® (bone metabolism + density) → Verisol® (skin elasticity + wrinkles)

• Vital Proteins – Professional Daily Foundational Support → contains a bioactive collagen complex including: • Fortibone® (bone support) • Fortigel® (joint support) • Verisol® (skin support)

• Orthomolecular – CollaGEN → Fortigel® (joint + cartilage support) → Tendaxion® (tendons, ligaments, connective tissue) → Mobilee® (hyaluronic acid for joint comfort) → Vitamin C + magnesium (collagen support nutrients)

These aren’t just random collagen powders—they’re designed to target specific tissues, not just provide general amino acids, and they’re built from peptide sequences that have been studied and shown to actually do something.

✔ If your goal is skin + “beauty” + cellular support

→ Look for formulas that combine collagen with supportive ingredients

Example:

• Thorne- Collagen Plus

Think: skin + hydration + cellular health

Where to Find These Collagen Supplements

If you’re wondering where to actually get these, I’ve made it simple.

I use Fullscript, where I organize all of my recommended supplements for clients. You can create a free account and access the exact collagen options I mentioned here.

Once you’re in, just search for these products based on your goals.

How Much Collagen Should You Take?

Most research uses doses between 2.5–15 grams per day.

• Skin → lower range
• Joints/bone → higher range

(Proksch et al., 2014; König et al., 2018)

What the Research Shows

When we look at clinical data, the question of do collagen supplements work becomes much clearer.

Skin Health

Improved skin hydration and elasticity (Proksch et al., 2014; Pu et al., 2023).

Joint Health

Modest improvements in joint pain and function, particularly in osteoarthritis (Zhu et al., 2024).

Bone Health (Especially for Women)

Improved bone mineral density in postmenopausal women when used consistently (König et al., 2018).

What I See in Practice

Beyond the research, I focus on how collagen functions as a functional tool in a real-world setting. While individual results vary, these are the areas where I consistently see the most impact:

Skin Vitality & “The Glow”: While “anti-aging” is a broad term, what I actually hear from clients is a noticeable increase in skin firmness and brightness. Realistically, collagen won’t erase wrinkles, but it can help to support that healthy, resilient “bounce” to the skin.

Joint & Bone Integrity: I’ve seen significant success in using collagen to reduce joint discomfort, especially in active individuals. More impressively, when integrated into a comprehensive wellness strategy, I have seen women move out of osteopenia ranges, suggesting it plays a vital role in long-term bone density.

Postpartum Recovery: This is a critical window of recovery. Because the body undergoes a continuous process of tissue remodeling for nearly a year after childbirth, collagen provides the targeted amino acids essential for repairing and strengthening connective tissue.

Closing the Nutritional Gap: In today’s modern diet, we rarely consume the “nose-to-tail” connective tissues that our ancestors did. We are essentially living in a collagen deficit. Supplementing collagen isn’t just an “extra”; it’s a way to fill a specific nutritional void that helps meet your total daily protein requirements for muscle and metabolic health.

Is Collagen Safe?

Collagen supplementation is generally considered safe.

A 2024 meta-analysis found no increase in adverse events compared to control groups in joint studies (Zhu et al., 2024).

What About Heavy Metals and Contaminants?

One concern that comes up with collagen supplements is the potential for heavy metals or contaminants. Because collagen is derived from animal tissues (skin, bones, connective tissue), the quality of the source matters.

Trace amounts of heavy metals can be found in many foods and supplements—not just collagen. However, reputable brands test for contaminants and follow strict quality standards to ensure levels remain well below safety thresholds.

This is where sourcing becomes important. Choosing third-party tested products and professional-grade brands helps reduce this risk significantly.

Bottom line:

✔ The risk is not zero—but it’s also not unique to collagen

✔ Quality and sourcing matter more than avoiding collagen altogether

✔ This is another reason I guide my clients toward specific, vetted products rather than random options online

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The Bottom Line

Collagen supplements are not a miracle.

But they’re also not a waste.

It’s a tool—and it works best when used intentionally.

So if you’ve been wondering, do collagen supplements work, the answer is: they can—when used strategically and consistently.

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Want Help Figuring Out What Your Body Actually Needs?

This is where most people get stuck.

It’s not about taking more supplements—it’s about having the right plan for your body.

I offer free discovery calls where we can talk through what’s going on, what you’ve tried, and walk through the different ways I can support you so we can decide on the best fit.

Depending on the person, we might be focusing on gut health, metabolism, hormones, postpartum recovery, or things like bone, skin, and joint health—it’s all connected.

If your main issue is gut symptoms like bloating or digestion that isn’t improving, my It Starts in the Gut® program is a great place to start.

Schedule a Free Discovery Call to chat with me.

References

• Shoulders MD, Raines RT. Annu Rev Biochem. 2009.
• Varani J et al. Am J Pathol. 2006.
• DePhillipo NN et al. Sports Health. 2018.
• Shigemura Y et al. J Agric Food Chem. 2009.
• Proksch E et al. Skin Pharmacol Physiol. 2014.
• Pu SY et al. Nutrients. 2023.
• König D et al. Nutrients. 2018.
• Zhu X et al. 2024 meta-analysis (osteoarthritis)
• Rao R, Samak G. Curr Opin Clin Nutr Metab Care. 2012.
• USDA FoodData Central
• Choi FD et al. J Drugs Dermatol. 2019