I have accidentally ended up on the wellness side of Instagram. I am not entirely sure when it happened. Perhaps after I searched for one Pilates video. Perhaps after I liked a recipe involving cottage cheese. Whatever the reason, there is no way back now.

The algorithm has convinced me that every three months humanity discovers a brand new secret to eternal youth. We had the protein era. Then came fibre, suddenly promoted from "that thing your grandma mentioned" to the hottest nutrient on the planet. The lymphatic system enjoyed a brief but spectacular moment in the spotlight. Supplements deserve a category of their own. One week everybody is checking ferritin. The next, magnesium becomes the answer to literally every problem from poor sleep to global uncertainty. The comments are full of people debating whether vitamins belong on your breakfast table or inside your body in capsule form. Nutritionists, as always, are having the time of their lives.

If you have survived the internet with at least some critical thinking intact, you have probably reached one rather disappointing conclusion: the boring things still work best. Sleeping enough. Eating mostly unprocessed food. Drinking water. Moving your body. Managing stress. Not smoking. None of these habits are particularly sexy. None can be sold in pastel packaging with a catchy slogan. Unfortunately, they also happen to be the closest thing we currently have to magic.

The same applies to your skin. Consistent skincare, sunscreen, healthy habits and, if needed, a dermatologist or cosmetologist who actually knows what they are doing. Easy? Yes. Interesting enough for social media? Absolutely not.

Enter collagen.

Somewhere along the way, collagen quietly became the king of wellness supplements. It is stirred into coffee, hidden inside protein bars, dissolved into glowing pink drinks and enthusiastically recommended by influencers with suspiciously perfect lighting. But what exactly is collagen? Why do we lose it? Can eating it replace it? And, perhaps most importantly, is science actually on Instagram's side this time?

Let's find out.

Collagen is the most abundant protein in your body, accounting for roughly 30% of your total protein. Think of it as the scaffolding that keeps everything where it belongs. It gives structure to your skin, strengthens bones, supports muscles, tendons and ligaments, cushions your joints and even helps maintain blood vessels and organs.

When people say collagen is the body's "glue", they are simplifying things, but not by much.

For your skin, collagen is particularly important because it provides firmness, elasticity and hydration. More than 90% of the dry weight of your skin is made up of collagen. It is, quite literally, what helps your face stay attached to your face.

The slightly unfair part? Around your late twenties, your body starts producing a little less collagen every year. Researchers estimate the decline at roughly one per cent annually, with production dropping more rapidly after menopause. Less collagen means thinner skin, reduced elasticity and, eventually, wrinkles. Welcome to adulthood.

Collagen also plays a major role elsewhere in the body. Healthy cartilage relies on it to absorb shock inside your joints. Bones are built on a collagen framework that later becomes mineralised, while skeletal muscles use collagen as part of their structural support. It is one of those proteins quietly doing several jobs at once without asking for recognition.

This is where things become slightly less intuitive.

Not really.

Well, technically you can eat collagen. Bone broth, chicken skin, fish skin and gelatin are all rich in it. The problem is that your digestive system doesn't politely escort collagen molecules to your cheeks and say, "These belong here."

Instead, collagen is broken down into individual amino acids and small peptides, exactly like most other proteins. Your body then decides how to use those building blocks wherever they are needed most.

So eating collagen doesn't mean your body simply replaces the collagen you have lost. Biology, as usual, refuses to be that convenient.

What does matter is making sure your body has everything it needs to produce collagen naturally. Vitamin C is essential for collagen synthesis, while zinc, copper and adequate protein intake all play supporting roles. Without those ingredients, your body can't efficiently build collagen regardless of how expensive your supplement happens to be.

Unfortunately, ageing is only part of the story.

Sun exposure is probably collagen's greatest enemy. Ultraviolet radiation accelerates collagen breakdown and is one of the main reasons sunscreen deserves its almost mythical reputation in dermatology.

Smoking also damages collagen production while reducing blood flow to the skin. Diets high in refined sugar contribute to a process called glycation, where sugar molecules attach themselves to collagen fibres, making them stiffer and more brittle. Chronic stress, poor sleep and excessive alcohol consumption don't help either.

None of this sounds particularly glamorous. Neither does wearing SPF every day. Yet here we are.

Surprisingly, this is one of the few wellness trends where the answer isn't an immediate eye roll.

Several systematic reviews and meta-analyses have found that hydrolysed collagen supplements can produce small but measurable improvements in skin hydration and elasticity after around eight to twelve weeks of daily use.

One widely cited 2023 meta-analysis reviewed 26 randomised controlled trials and concluded that collagen supplementation improved skin hydration and elasticity, particularly after two months of consistent use. A 2024 systematic review and meta-analysis reached similar conclusions, reporting improvements in skin moisture and elasticity after roughly twelve weeks.

An even larger umbrella review published in 2025 examined sixteen systematic reviews covering more than 7,900 participants and found fairly consistent evidence for modest improvements in skin quality. However, the authors also noted that many of the underlying studies were of low or moderate methodological quality.

And here comes the less Instagram-friendly part. A separate 2025 meta-analysis examining study quality and industry funding found that, although collagen appeared beneficial when all trials were pooled, the effects were no longer statistically significant when researchers looked only at high-quality studies or trials without industry funding.

In other words, collagen probably does something. The question is simply whether that "something" is as impressive as wellness marketing would like you to believe.

The current scientific consensus is probably best summarised as: promising, modest and deserving of more high-quality research.

This is where social media gets ahead of the evidence.

Despite endless claims online, there is currently no strong evidence that collagen supplements significantly increase hair growth or prevent hair loss. Hair is made primarily from keratin rather than collagen, and while collagen provides amino acids your body can use, there are very few robust human studies showing a direct benefit.

Nails look slightly more promising, but only slightly. Some small studies suggest collagen may reduce brittleness and help nails grow faster, yet the evidence remains limited and far weaker than it is for skin.

If your lifestyle consists of four hours of sleep, weekend sunbathing without sunscreen, stress-fuelled takeaway dinners and the occasional cigarette "for balance", collagen is unlikely to rescue the situation. Biology is stubborn like that.

If, however, you already eat well, move regularly, sleep enough and generally take care of yourself, collagen supplements may offer a small additional improvement, particularly for skin hydration and elasticity. Think of them as the final five per cent, not the first ninety-five.

Wellness would be considerably less profitable if the most effective advice remained: sleep, vegetables, sunscreen and enough water. None of those fit neatly into a beautifully branded jar.

Unfortunately for Instagram, they are still very difficult to beat.