What is collagen and what does it do in the body?

Collagen is the most abundant protein in the human body — roughly 30% of all the protein we have. Its job is to give structure, strength and support to tissues: skin, muscle, bone, tendons, ligaments, blood vessels and even the lining of the gut. Without it, the body would lose the scaffolding that holds everything in place. It is also the protein most closely tied to skin structure and elasticity, which is why it comes up so often in conversations about beauty and ageing.

What collagen actually is, and where it sits in the body

Around 28 different types of collagen have been identified. Type I is the most common, making up roughly 90% of the collagen in the body. It is found in skin, bone, tendons and ligaments.

Chemically, collagen is built from amino acids — mainly proline, glycine and hydroxyproline. The body needs adequate vitamin C, zinc, copper and manganese to assemble them correctly. That means a balanced diet containing those nutrients is the foundation for your body to make its own collagen. There is no shortcut that replaces it.

Something plenty of people do not realise: collagen cannot be measured in a blood test. There is no value you can ask your doctor for to find out "how much collagen I have". What exists is clinical observation of tissues, and the knowledge that production falls with age. That makes it hard to know, as an individual, whether a supplement is making any difference — and it is one of the reasons the evidence is argued over so much.

Why collagen production falls as you get older

The body makes less collagen as it ages, and the collagen already there breaks down faster. This is a natural process, not a disease. You notice it in the skin, which loses structure, strength and elasticity. There is no way to stop the process, but some habits speed it up and others protect against it.

Smoking is one of the main enemies. Excessive sugar and refined carbohydrates also damage collagen that already exists. Unprotected exposure to ultraviolet light degrades the skin and the collagen in it. On the protective side, the advice is simple and deeply unglamorous: daily sunscreen and a balanced diet, along the lines of the Mediterranean pattern. Even so, the scientific research on most collagen supplements is thin, and the benefits may be more widely publicised in the media than the evidence supports.

Does eating collagen raise the collagen in your body?

Not directly. Collagen is not absorbed in its whole form. When you eat a food or take a supplement containing collagen, your digestive system breaks the proteins down into amino acids. Those amino acids are then used by the body for whatever it needs — not necessarily to build collagen. The body does not receive an instruction saying "use this for the skin".

None of that makes supplements useless. It means the mechanism is not the one advertising suggests. The idea that you "top up" collagen the way you top up a glass of water does not match what is known about digestion and absorption.

What the research on collagen supplements shows

Here it pays to be honest: the scientific research on most collagen supplements is sparse. The few randomised trials that have been done suggest collagen peptides may be effective for improving skin hydration and elasticity. But there are two significant problems. First, many of those studies are funded by the supplement industry. Second, the benefits may be more inflated in the media than the evidence supports.

A 2023 systematic review, pooling 26 randomised trials with 1,721 participants, found significant improvements in skin hydration and elasticity with hydrolysed collagen compared with placebo. The authors identified several sources of bias in the included trials and concluded that larger-scale studies are needed to confirm the results. In other words: the evidence is promising, but it is not settled. We still do not know who benefits most, at what dose, for how long, or whether the effects persist after you stop.

If you have read elsewhere that "collagen works" or "collagen doesn't work", the honest answer is that it depends what is being measured and how good the study was. For skin hydration and elasticity, there are positive signals. For other claims you hear floating around — joints, hair, nails — nothing in the information here lets us assert anything at all. There are no guarantees.

Where food and daily habits come first

Before you think about supplements, it is worth looking at what is already within reach. The body builds collagen if it has the right materials: amino acids (from proteins such as eggs, fish, meat and pulses) and the cofactors — vitamin C, zinc, copper and manganese. Those four nutrients are what the body needs in adequate amounts to make collagen.

The Cleveland Clinic recommends daily sunscreen and a balanced diet, such as the Mediterranean diet, as habits that help protect collagen. Sleeping well, not smoking and going easy on sugar all count too. None of this is new, but it is what the evidence supports most solidly.

Practical timing matters less than people expect. There is no research in front of us suggesting a particular hour of the day makes a difference, so the useful rule is the boring one: pick a moment you will actually remember. With breakfast, with your evening routine, whenever it fits. Forgetting is the real problem, not scheduling.

Where a supplement might fit — and where it does not

If you decide to try one, collagen supplements come in several formats. TuttiBear only sells gummies, and you should know that we do not sell capsules, tablets, powders or liquids. Collagen Gummies provide 1000 mg of hydrolysed collagen per serving of 2 gummies, alongside vitamin C, biotin and selenium. Vitamin C is one of the nutrients the body needs to make collagen — but that is not the same as saying the gummy improves your skin. We make no such promise, because the evidence does not clearly support one.

Glow Up is a pack of other products and we hold no label details for it, so we cannot tell you what it contains. If it interests you, check the label.

A supplement may make sense for someone who wants an additional intake of hydrolysed collagen and the nutrients that come with it, knowing that the possible benefits are limited, at best, to skin hydration and elasticity, and that the studies are not definitive. It does not replace a balanced diet or sun protection. Nor is there any reason to expect quick results: the available research is limited and the possible benefits remain unconfirmed.

On cost, be clear-eyed. A supplement is a recurring expense, and the honest position is that you are paying for an uncertain benefit. That is not an argument against trying it; it is an argument against expecting it to do the work that sunscreen and diet do.

What belongs with your doctor or pharmacist, not with this article

Some decisions should not be made on the basis of an article. If you have a diagnosed skin condition, if you are pregnant or breastfeeding, if you take regular medication or have a chronic illness, speak to your doctor or pharmacist before starting any supplement. The same applies if you have symptoms that worry you — joint pain, changes in your skin, hair loss. No collagen supplement treats those things, and delaying a medical assessment while waiting for results is a real risk.

Collagen gummies contain polyols and excessive consumption may have laxative effects. Do not exceed the recommended daily dose and keep out of reach of young children. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle.

What to do next, sensibly

If your goal is long-term skin health, start with what is established: sunscreen every day, a balanced diet, not smoking, and moderating sugar. If you want to try a collagen supplement, treat it as a low-risk add-on with an uncertain payoff — not as a treatment. Give it a few weeks, notice whether you see any difference in your skin, and do not keep going out of habit if you see nothing. And if you are unsure whether it suits you, ask someone who knows your clinical history. The evidence does not yet allow us to promise more than that.