Collagen: benefits, sources and whether you need it
Collagen is the most abundant protein in the human body — it holds your skin, joints, tendons and bones together. It has become one of the best-selling products on supplement shelves, but does the average Estonian who trains actually need it? The short answer: it depends. Read on for the longer answer.
What exactly is collagen?
Collagen is a fibrous protein that forms the basic structure of connective tissue. Think of it as a reinforcing mesh that holds tissue together while also giving it elasticity. It makes skin firm, tendons resilient and cartilage cushioning — around 60% of cartilage tissue is collagen.
Collagen occurs naturally only in animal foods that contain connective tissue — such as slow-cooked meat, bone broth, chicken skin and oily fish. Plant foods contain no collagen themselves, but they provide the building blocks your body needs to produce its own: amino acids, vitamin C, zinc and copper.
Why collagen levels decline with age
After around age 25, your body’s collagen production starts to decline — slowly but steadily. In the deeper layers of your skin, the once-orderly network of fibers becomes increasingly tangled. The result is what you see in the mirror: thinner skin and wrinkles, along with joints that “creak” more.
Age is not the only factor. The following accelerate collagen breakdown the most:
- too much sun exposure without sunscreen
- smoking, including exposure to secondhand smoke
- regular alcohol consumption
- chronic sleep deprivation
- physical inactivity
- chronic stress (high cortisol levels suppress collagen production)
In practice, environmental and lifestyle factors combine to leave your body’s collagen levels significantly lower at 40 than at 20. You cannot stop this process entirely, but you can slow it down.
Collagen supplements — what the research says
Collagen is sold mainly in two forms: hydrolyzed collagen and collagen peptides. These are the same thing — large collagen protein molecules broken down into smaller pieces so your gut can absorb them more easily. Alongside collagen, most products contain vitamin C, biotin and zinc to support your body’s own collagen synthesis.
What do actual studies show? Randomized controlled trials have found that taking hydrolyzed collagen regularly produces measurable improvements in skin elasticity and hydration. Results for joints are also promising — particularly for joint pain caused by osteoarthritis and sports injuries. Cartilage breakdown is one of the main causes of joint pain, and since cartilage consists largely of collagen, the reasoning makes sense.
A balanced picture does, however, call for a couple of caveats. Collagen supplements are something of a Wild West when it comes to regulation: in the US, the FDA does not check products before they reach the market, while oversight in Europe is better but still imperfect. There have been cases where the amount stated on the label did not match the contents, or traces of heavy metals were found in low-cost batches. If you buy collagen, choose a product with European Union certification from a better-known manufacturer.
Practical tips: how to support collagen without supplements
A supplement is not the first step. Before buying a tub of powder, take a look at your lifestyle — it can deliver longer-lasting results at no cost:
- Get 7–9 hours of sleep. Much of your collagen synthesis takes place while you sleep.
- Train regularly. A gentle walk alone is not enough — you need to raise your heart rate and get your metabolism going. Research suggests that combining strength training and cardio slows the skin’s aging processes.
- Eat enough protein — around 1.6 g per kilogram of body weight per day if you train. The amino acids glycine and proline are particularly important, as they are building blocks of collagen.
- Use sunscreen from April to September, even on cloudy days. UV radiation is collagen’s number one enemy.
- Cut down on alcohol and smoking — the effect is direct and visible within just a couple of months.
- Make an effort to reduce stress. High cortisol levels suppress collagen production.
If you have these basics in place and still want to try a collagen supplement, start with a modest amount of around 10 g per day, take it with a meal containing vitamin C, and be patient — changes in your skin and joints only become noticeable after 8–12 weeks.
Collagen FAQs
Do collagen tablets and powder work the same way?
The active ingredient is the same, but the dose differs. Tablets contain relatively few grams of collagen — you would need to swallow dozens of capsules a day to get an effective amount. Powder provides a much larger dose for the same price, and you can mix it into your morning coffee or smoothie.
Does plant-based collagen exist?
No, collagen is by definition an animal protein. “Vegan collagen” is actually a blend of substances that support collagen synthesis — vitamin C, zinc and amino acids — without any collagen itself.
When will I see results?
Studies have shown changes in skin elasticity after 8 weeks, while joint improvements often appear only at week 12. If nothing happens within a month, that is normal — there is no reason to give up.
Author: Timo Majuri
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