It is talked about everywhere: on social media, in gyms, and even in dermatology clinics. Collagen has become the undisputed star of dietary supplements. But is it just a passing trend or a genuine biological necessity?
If you are wondering about the difference between marine and bovine collagen, whether it really works for wrinkles or tendinitis, and how to dose it, you are in the right place.
Here is everything science says about collagen, without unnecessary jargon.
What is collagen?
Collagen is the most abundant protein in the human body. Imagine it as the “glue” that holds everything together. It accounts for approximately 30% of all the proteins in our body and provides structure to our skin, tendons, bones, muscles, and blood vessels. Not insignificant, is it?
Why are we lacking collagen?
From age 25, our natural collagen production begins to decline (by approximately 1% to 1.5% less each year).
- At age 40, we have lost a significant amount of it.
- At age 60, our reserves are drastically reduced.
This deficiency causes wrinkles, skin sagging, joint pain, and fragile ligaments.
The 6 Proven Benefits of Collagen
Why are more and more people taking it? Here are the effects validated by recent clinical studies:
Anti-Aging and Skin Beauty
This is the number one reason people buy it. Collagen supplementation improves skin elasticity and hydration and reduces wrinkle depth. It helps “plump up” the dermis from within (see diagram above).
Joint and Tendon Health (Sports)
For athletes (weight training, running, CrossFit), collagen is crucial. It strengthens connective tissues (tendons and ligaments), reducing the risk of injury and speeding recovery after tendinitis.
Osteoarthritis Relief
Studies show that collagen (particularly Type II) can reduce osteoarthritis-related pain and improve joint mobility in older people.
Muscle Mass
Combined with resistance training, it helps combat age-related muscle loss.
Hair and Nails
It provides the amino acids needed (glycine, proline) to strengthen keratin, making nails less brittle and hair more resilient.
Collagen and digestion: potential support for the gut
Collagen is attracting growing interest for its potential role in digestive health, particularly in intestinal permeability disorders, often referred to as leaky gut. Specific amino acids in collagen, such as glycine, glutamine, and proline, contribute to the repair and integrity of the intestinal lining. They may help strengthen the junctions between the cells lining the intestine, thereby improving the digestive barrier and reducing local inflammation. This supportive action also contributes to better digestion and more efficient nutrient absorption. While not a treatment, collagen is increasingly incorporated into a holistic approach to intestinal well-being, alongside a balanced diet, adequate hydration, and a healthy lifestyle.
Collagen: It's Hard to Know Which One to Choose
Which Type I, II, and III Collagen Should You Choose?
There are several types of collagen, each with a specific role in the body.
- Type I collagen is the most abundant: it makes up the skin, bones, tendons, and ligaments. It is the type to prioritize for improving skin firmness, strengthening connective tissues, and supporting athletic recovery, particularly for runners and endurance athletes.
- Type II collagen is concentrated in cartilage and is more suitable for people experiencing joint discomfort or seeking to preserve joint flexibility.
- Type III collagen often accompanies Type I because it structures organs and promotes greater tissue elasticity. For sports or performance goals, the Types I + III combination is generally the most relevant, while Type II is ideal for specifically targeting joint health.
Marine or Bovine Collagen: What Are the Differences?
This is the most frequently asked question. The answer depends on your goals.
| Characteristic | Marine Collagen (Fish) | Bovine Collagen (Beef) |
| Source | Fish skin, bones, and scales | Cattle skin, bones, and cartilage |
| Dominant type | Type I (Similar to that found in human skin) | Types I and III (Sometimes Type II for cartilage) |
| Absorption | Often considered slightly superior (smaller molecules) | Very good when hydrolyzed |
| Best for... | Skin, hair, anti-aging | The intestines, overall recovery, joints |
| Price | Generally more expensive | Often more affordable |
For a purely aesthetic goal (wrinkles, radiance), choose marine collagen. For an overall health goal, a limited budget, or extensive joint recovery, bovine collagen is excellent.
Does vegan collagen (made from algae) exist?
Technically, no. Collagen is an animal protein. Products sold as “vegan collagen” are actually boosters (mixtures of vitamins and amino acids) intended to help your body produce its own collagen, but they are not pure collagen.
How to choose the right collagen? (Quality Criteria)
Don’t be fooled by marketing. Check these 3 points on the label:
-
Hydrolyzed (or Collagen Peptides): Native collagen is a molecule that is too large to be digested. It must be “cut” into peptides (through hydrolysis) to cross the intestinal barrier. Make sure the packaging mentions “hydrolysate” or “peptides.”
-
Molecular weight: It is measured in Daltons (Da). Aim for a low molecular weight, ideally below 2,000 or 3,000 Daltons, for maximum absorption (the renowned Naticol or Peptan label is a mark of quality). A collagen molecule has a molecular weight of 30,000 Da in its raw form.
-
The presence of Vitamin C: Vitamin C is essential for collagen synthesis in the body. If your powder does not contain any, eat a piece of fruit or take a Vitamin C tablet at the same time.
- The origin of the fish used for marine collagen: Several labels and certifications are recognized as guarantees of fishing practices that respect marine resources.
-
- Marine Stewardship Council (MSC): the most internationally recognized label for sustainable wild-caught fishing. It certifies that the fish come from sustainably managed fisheries, that stocks are preserved, and that environmental impacts are reduced.
- Friend of the Sea (FoS): a European/international label covering both wild-caught fishing and aquaculture. It verifies that the fish or seafood products used comply with strict standards for sustainability, species conservation, and traceability.
- Aquaculture Stewardship Council (ASC) — especially relevant if the marine collagen comes from farmed sources: this label certifies responsible aquaculture that respects the environment, marine populations, and good farming practices.
- Sustainable Fishing (French label): for products from French fisheries that meet sustainability, limited environmental impact, and good fishing-practice criteria.
Collagen dosage: how many grams per day?
Forget capsules, which often contain tiny doses (500mg). The studies are clear: you need an adequate amount.
- For skin: 2.5g to 5g per day.
- For joints and sports: 10g to 20g per day.
Choose powder rather than capsules. To get 10g of collagen, you would have to swallow 20 large capsules! A scoop of powder in a glass of water is much simpler.
Does collagen make you gain weight?
No. It is a pure protein and very low in calories (about 36 kcal per 10g). It may even help with satiety.
When should it be taken?
Timing matters little. In the morning in coffee, in the afternoon in yogurt, or in the evening. Consistency is what matters.
How long does it take to see the effects of a collagen course?
It's not magic.
- Skin: Initial results after 4 to 8 weeks.
-
Joints: Allow 3 to 6 months of daily use to feel lasting relief.
Which foods naturally contain collagen?
Collagen is found mainly in foods of animal origin because it makes up a large part of connective tissue. It is found in the skin, bones, cartilage, and tendons of animals. The best natural sources are therefore bone broth, collagen-rich meats (shank, cheek, oxtail), chicken skin, fish skin, and certain organ meats. These foods release collagen when cooked slowly for a long time, especially in broths or stews. Although plants do not contain collagen, they provide essential nutrients such as vitamin C, copper, and zinc, which are needed for its synthesis in the body. A varied diet combining animal sources with plant-based micronutrients can therefore help naturally support collagen production.
What are the dangers or side effects of collagen?
Collagen is generally well tolerated, but like any supplement, it can cause certain side effects in a minority of people. The most common are mild digestive issues: bloating, abdominal discomfort, or a feeling of heaviness, especially with high doses or low-quality collagen.
People allergic to fish or seafood should be particularly cautious, as most marine collagen comes from fish skin or bones. Some users may also notice a slight change in appetite or satiety.
Generally speaking, the risks remain low, but it is important to choose traceable, purified, certified collagen and start with small doses to assess your individual tolerance. In the event of a medical condition, pregnancy, or specific medical treatment, professional advice is recommended.
Why choose Mulebar collagen?
Choosing Mulebar marine collagen means choosing premium quality and scientifically validated effectiveness to support your body every day.
Formulated with Naticol® type I and III collagen, this supplement stands out for its high bioavailability: thanks to its patented hydrolysis process (low-molecular-weight peptides of approximately 2,000 Da), it is perfectly absorbed by the body to act deep within your tendons, ligaments, joints, and skin. Ideal for endurance athletes as well as active people who want to age better, it supports recovery, joint comfort, and skin elasticity.
In addition, Mulebar is committed to ethics and transparency with a 100% natural product, made in France and sourced from certified sustainable fishing Friend of the Sea.
Convenient, its neutral-tasting powder easily mixes into drinks or smoothies, with a single 5 g scoop being enough to replace a dozen standard tablets.
Collagen is not just a beauty product; it is an essential health ally after the age of 30, and even more so if you are athletic. To get started, choose hydrolyzed collagen powder, aim for 10 g per day, and be patient: consistency is the key to success.
