How does collagen work? What it does in your body

Collagen is the most abundant protein in the human body, acting as a kind of "glue" that holds tissues together. It is found in bones, skin, tendons, ligaments, and cartilage, and it is what gives skin its structure and elasticity. When you ask "how does collagen work?", the short answer is: it is the raw material your body uses to repair and renew connective tissues. But there are important nuances between what collagen does naturally and what a supplement can actually change.

What is collagen and why is it so important?

Collagen is a fibrous protein made up of chains of amino acids — mainly glycine, proline, and hydroxyproline. These chains twist into triple helices, forming strong fibres that give mechanical support to tissues. Think of it as the body's scaffolding: without it, skin loses firmness, joints become less cushioned, and bones become more fragile.

The body produces collagen continuously, but this process is not static. From around age 25–30, synthesis begins to decline and degradation increases. It is estimated that we lose about 1% of our collagen per year after that age — a figure that appears in many articles, but varies from person to person and depends on factors such as genetics, sun exposure, and smoking.

How does collagen act in the body?

When you consume collagen — whether through food or supplements — your body does not use it directly as is. Proteins are broken down in the stomach and small intestine into smaller peptides and amino acids. These fragments are absorbed and enter the bloodstream. From there, the body decides where to apply them: it may use them to synthesise new collagen in the skin, bones, or joints, or for other metabolic functions.

Here is the key point: the collagen you eat does not go straight to your skin. It is dismantled and reassembled according to the body's needs. That means the effect is neither immediate nor direct — it depends on the body having the right nutrients and signals to produce more collagen in the right places.

A concrete example helps. Imagine your body is a construction site undergoing constant renovation. The collagen you consume is like the bricks and mortar delivered to the site. The contractor — your body — decides whether to use them to reinforce the facade (skin), replace beams (bones), or repair the floor (cartilage). If the work is going well, materials are applied where they are needed. But if other nutrients, such as vitamin C, are lacking, the work slows down and materials may be diverted to other needs.

What does the scientific evidence show?

The evidence on collagen supplements is mixed, but there are promising signs. Observational studies and some clinical trials suggest that supplementation with hydrolysed collagen may improve skin elasticity and reduce pain in joints with osteoarthritis. However, many of these studies are small, industry-funded, or have modest results.

The available studies on collagen, both for the skin and for the joints, are mostly small and of variable quality, and the results are not always consistent with one another, so any promise of results should be read with caution. The scientific consensus is that collagen may help, but it is not a miracle solution.

There is also an important issue: the body does not distinguish between the collagen you consume and other proteins. The amino acids are the same as you would find in meat, fish, or eggs. Some researchers argue that a protein-rich diet would be sufficient, but the specificity of collagen — with its bioactive peptides — may have effects that other proteins do not. Still, there are no certainties.

Who might actually benefit from supplementing?

If you are under 30, healthy, and have a balanced diet, you probably do not need collagen supplements. Your body still produces enough. But if you notice signs of skin ageing, have joint pain, or do high-impact sports, supplementation may be an option to consider.

It also makes sense for those with restrictive diets, such as vegetarians or vegans — although collagen is almost entirely of animal origin, there are vegan options that stimulate the body's own production. But be aware: the evidence for these products is even weaker.

If you are thinking about supplementing, the first step is to talk to a doctor or nutritionist. They can assess whether it makes sense for your case and at what dose.

What difference does the gummy format make?

Gummies are just a delivery format. The collagen in them is the same as in powders or capsules — hydrolysed, meaning broken into smaller fragments for easier absorption. The difference lies in convenience and taste, not in the mechanism of action.

However, gummies have a downside: they often contain sugar or sweeteners to improve the taste. If you are supplementing for health reasons, that may be a factor to consider. Check the label to know exactly what you are ingesting.

At TuttiBear, Collagen Gummies are a convenient way to include collagen in your daily routine, without having to mix powders or swallow capsules. The Glow Up pack combines these gummies with other vitamins for skin, hair, and nails, if you want a more comprehensive approach.

Where does popularity outrun the evidence?

There are many exaggerated promises around collagen. Saying it "eliminates toxins" or "reduces stress" are claims without scientific support — and, in the European Union, such claims are prohibited on supplements. There is also no proof that collagen can "reverse" ageing or "cure" joint conditions. At most, the evidence suggests a slowing of signs of ageing or slight relief from discomfort.

Another common exaggeration is dosage. Many brands recommend high doses, but there is no consensus on the ideal dose. Studies use between 2.5 g and 15 g per day, but more is not necessarily better. The body can only use a limited amount.

And then there is time: effects are not immediate. Skin, for example, renews itself in cycles of about 28 days, but collagen effects may take 8 to 12 weeks to appear. If you expect results in a week, you will be disappointed.

What should you do with this information?

If you want to try it, start with a moderate dose and be consistent. Take it daily for at least two months before evaluating. Combine with vitamin C, which is necessary for collagen synthesis in the body — you can get it from citrus fruits or a supplement.

But do not expect collagen to do everything on its own. A diet rich in protein, adequate hydration, sun protection, and not smoking are factors just as important, if not more so, for skin and joint health.

And remember: collagen is a supplement, not a medicine. If you have severe pain or health problems, consult a professional. Supplementation is a complement, not a substitute for medical treatments.

The truth is that collagen works — but within limits. The body needs it, and supplementation may help when natural production declines. But it is not a magic wand. Use it with realistic expectations and as part of a healthy lifestyle.