When you hear the word collagen, what's the first thing you think about?
Skin? Hair? Maybe nails?
Those are probably the benefits that made collagen famous, but they leave out a pretty big part of the story.
Collagen is a structural protein found throughout your body.
It's part of your skin, yes. But collagen is also a major component of connective tissues including tendons, ligaments, cartilage, and bone.
And researchers have been studying what collagen supplementation may mean for some of those tissues, too.
For women thinking about staying strong, active, and capable as we age, this is where the collagen conversation gets especially interesting.
Your Body Is Built With Collagen
Collagen is the most abundant protein in the human body.
Different types of collagen are distributed throughout different tissues, helping provide structure and mechanical strength.
That means when we talk about supporting collagen, we're talking about much more than what we can see in the mirror.
Think:
Skin. Tendons. Ligaments. Cartilage. Bones.
Your body is constantly remodeling these tissues. Old material is broken down and new material is produced.
And just like muscle, those tissues respond to what we eat and what we do.
That's where nutrition + movement become an interesting combination.
Exercise Doesn't Only Challenge Your Muscles
When you strength train, your muscles aren't working alone.
Every squat, deadlift, lunge, push-up, and walk also places mechanical load on the connective tissues and bones supporting that movement.
That's a good thing.
Your body responds to appropriate mechanical loading by adapting.
Researchers have therefore become interested in whether combining exercise with collagen-derived amino acids and peptides could provide nutritional support for the tissues being challenged.
A 2021 systematic review looked at 15 randomized controlled trials studying collagen supplementation alongside exercise.
The authors found the strongest evidence around improvements in joint function and joint pain, while some studies also reported improvements in strength, body composition, and exercise recovery. They also found evidence that collagen intake can increase markers of collagen synthesis under certain conditions.
But there's an important distinction.
Collagen and Protein Powder Don't Have the Same Job
This is something I really want women to understand.
Collagen is protein, but collagen isn't a replacement for a complete dietary protein like whey.
Collagen has a very different amino-acid profile. It's particularly rich in amino acids associated with connective tissue, including glycine and proline, but it is not considered a complete protein.
When researchers reviewed collagen + exercise studies, they found that collagen could increase collagen-synthesis markers, but it did not stimulate muscle protein synthesis as effectively as higher-quality complete proteins.
So we don't need to choose:
Protein OR collagen.
They serve different nutritional purposes.
If building and preserving muscle is the goal, getting enough high-quality dietary protein remains incredibly important.
Collagen can be thought of as an addition to that foundation, particularly when we're interested in connective tissues.
What Happened When Women Took Collagen While Strength Training?
Here's where we get a study specifically involving women.
Researchers recruited 77 premenopausal women and put them through a 12-week resistance-training program.
They trained three days per week.
One group consumed 15 grams of specific collagen peptides every day, while the other received a placebo.
After 12 weeks, both groups benefited from resistance training — which is worth emphasizing all by itself.
But the women taking collagen experienced a significantly greater increase in fat-free mass than the placebo group. They also had a greater reduction in body-fat percentage and a significantly larger improvement in hand-grip strength. Improvements in leg strength occurred in both groups and were more pronounced in the collagen group.
Does that mean collagen is a muscle-building replacement for whey protein?
No.
This was one study using specific collagen peptides, and the body-composition measurements were made using bioelectrical impedance rather than more precise imaging techniques.
But it does add another interesting piece to the research around collagen + resistance training.
And strength isn't the only area researchers have studied.
Let's Talk About Bones
Your bones might seem hard and completely different from skin or tendons, but bone has a collagen-rich organic matrix.
That means collagen is part of the structural framework onto which bone mineral is deposited.
And for women, bone health becomes increasingly important with age.
One randomized, double-blind, placebo-controlled trial enrolled 131 postmenopausal women with age-related reductions in bone mineral density.
Participants received either 5 grams of specific collagen peptides daily or placebo for 12 months.
At the end of the study, researchers found that bone mineral density at both the femoral neck and spine increased significantly in the collagen group compared with placebo. Researchers also observed changes in biomarkers related to bone formation and degradation.
Another 12-month randomized study in postmenopausal women with osteopenia compared calcium + vitamin D with calcium + vitamin D plus 5 grams of collagen peptides. The collagen group showed improvements in several trabecular and cortical bone measurements and prevention of decline in spine bone mineral density compared with calcium and vitamin D alone.
That's fascinating.
But it isn't the same thing as saying:
"Take collagen and you'll prevent osteoporosis."
We don't have evidence to make that claim.
These studies involved specific collagen peptides and particular groups of postmenopausal women. Larger independent trials are still needed.
What they give us is a reason to continue studying collagen as part of the much bigger healthy-aging conversation.
And Then There Are Your Joints + Connective Tissues
This might actually be one of the most intuitive applications.
Tendons and ligaments contain substantial amounts of collagen, and cartilage relies heavily on an extracellular matrix containing collagen.
Exercise creates a stimulus for these tissues.
Nutrition provides raw materials.
One small randomized crossover study investigated what happened when participants consumed vitamin-C-enriched gelatin before brief bouts of exercise.
Participants receiving 15 grams of gelatin approximately one hour before exercise showed roughly double the blood concentration of a marker associated with type I collagen synthesis compared with baseline.
The researchers concluded that combining the nutritional intervention with exercise could increase collagen synthesis, although this was a very small study of only eight healthy men and used gelatin rather than the hydrolyzed collagen supplements commonly sold today.
That's not enough evidence to create a universal "take collagen exactly one hour before your workout" rule.
It does illustrate something we talk about often:
Nutrition and movement work together.
So, Should You Take Collagen Before Your Workout?
You don't need to turn collagen timing into another thing to obsess over.
There is research interest in taking collagen or gelatin near exercise because exercise provides a mechanical stimulus to connective tissue while collagen supplies relevant amino acids.
But we don't yet have enough evidence to say everyone needs to take collagen at an exact time to experience benefits.
For most people, building a consistent routine is going to be far more realistic than chasing a perfect timing window.
Add it to your morning coffee.
Put it in your smoothie.
Mix it into oatmeal or yogurt.
Pair it with your existing protein routine.
Pick something you'll actually do again tomorrow.
Collagen + Vitamin C: What's the Connection?
Vitamin C deserves a mention here because your body needs it for normal collagen synthesis.
That doesn't mean you need a megadose of vitamin C every time you take collagen.
It means your overall diet matters.
Fruit, vegetables and other vitamin-C-rich foods provide a nutrient your body literally requires for the biochemical processes involved in creating and stabilizing collagen.
Once again, supplements work best when they're part of the bigger picture rather than expected to be the whole picture.
A Quick Reality Check on Collagen Research
Collagen research is interesting.
It also isn't perfect.
Many trials are relatively small, use different types and doses of collagen, study different populations and measure different outcomes.
And some collagen studies have industry funding or involvement.
That's important context.
Skin research is a good example of why we shouldn't oversell the evidence. A 2023 meta-analysis of 26 randomized trials involving 1,721 participants found significant improvements in hydration and elasticity with hydrolyzed collagen, but also identified biases in the available trials.
More recently, a 2025 meta-analysis came to a much more skeptical conclusion: although pooled results initially favored collagen for hydration, elasticity and wrinkles, those benefits disappeared when researchers separately analyzed higher-quality studies or studies without pharmaceutical-company funding.
Meanwhile, a newer 2026 umbrella review encompassing 16 systematic reviews, 113 randomized trials and 7,983 participants concluded that collagen supplementation was consistently associated with favorable dermal, bone and muscular outcomes.
Science isn't always perfectly tidy.
And that's okay.
Rather than pretending every collagen question has been settled, we can look at the totality of evidence, understand its limitations, and continue watching as better research becomes available.
The Peachie Takeaway 🍑
Maybe it's time we stop thinking of collagen as something we take because we don't want wrinkles.
Your body is made of so much more than what you see in the mirror.
Muscle helps you produce force. Bones give you structure. Tendons connect muscle to bone. Ligaments help stabilize joints. Connective tissues help hold everything together.
And movement challenges all of it.
That's why our approach isn't going to be collagen instead of protein, collagen instead of strength training, or a scoop of anything instead of taking care of yourself.
It's the combination that matters:
Eat enough protein. Strength train. Move your body. Eat nutrient-dense foods. Support your connective tissues. And do it consistently.
That's the kind of healthy aging we're interested in.
Not just looking younger.
Staying strong enough to keep doing the things you love.
Stay Peachie 🍑
Collagen + Healthy Aging FAQs
Is collagen good for joints?
A systematic review of 15 randomized controlled trials found that some of the strongest evidence for collagen supplementation combined with exercise involved improvements in joint function and reductions in joint pain. However, results vary depending on the population, collagen product and condition being studied.
Can collagen help build muscle?
Collagen shouldn't replace complete dietary proteins for building muscle. It has a different amino-acid profile and does not stimulate muscle protein synthesis as effectively as higher-quality complete proteins. One randomized study in premenopausal women did find greater improvements in fat-free mass and some strength measures when specific collagen peptides were combined with resistance training, but more research is needed.
Is collagen good for women's bones?
Some clinical trials in postmenopausal women have found favorable changes in bone mineral density or bone measures after 12 months of specific collagen-peptide supplementation. These findings are promising but don't establish collagen as a treatment or preventive measure for osteoporosis.
Should I take collagen or protein powder?
They don't have to be either/or. Complete proteins such as whey provide all essential amino acids and are particularly useful for supporting muscle protein synthesis. Collagen has a different amino-acid profile and is being studied primarily for connective-tissue, skin, joint, and bone-related outcomes. Think of collagen as complementary to an adequate-protein diet rather than a substitute for it.
Should I take collagen before working out?
Some research has investigated collagen or gelatin around exercise, but there isn't enough evidence to establish one universally optimal time. A small study found increased markers of collagen synthesis when vitamin-C-enriched gelatin was consumed one hour before exercise, but it included only eight men and shouldn't be interpreted as a universal timing rule.
How long does collagen take to work?
It depends entirely on what outcome you're measuring. Skin studies often run for roughly 8–12 weeks, resistance-training studies have reported outcomes after 12 weeks, and some bone studies have followed women for 12 months. Collagen should be thought of as a consistent nutritional habit rather than a quick fix.
