Collagen: Benefits, Skin Health, and How to Actually Take It
Collagen production declines by roughly 1–1.5% per year from your mid-20s, meaning by your 40s, your skin has significantly less structural support than it did two decades earlier.
A 2024 randomised controlled trial found 12 weeks of daily hydrolysed collagen increased skin hydration by 13.8%, improved elasticity by 22.7%, and reduced wrinkle depth by 19.6%.
A meta-analysis of 26 clinical studies (1,721 participants) confirmed hydrolysed collagen significantly improves skin hydration and elasticity compared to placebo.
Collagen is everywhere right now; in powders, drinks, gummies, and capsules.
But unlike a lot of wellness trends, there's a genuine scientific basis for why people are taking it.
Your body naturally produces collagen, but production starts declining in your mid-20s and continues to drop from there.
Sun exposure, smoking, sugar, and stress all speed that process up.
Collagen supplements aim to help your body keep up with demand
What Is Collagen, Exactly?
Collagen is a structural protein. It's essentially the scaffolding that holds your body together.
It's found in your skin, joints, tendons, ligaments, bones, and gut lining.
There are several types of collagen, but the main ones you'll see in supplements are:
Type I: The most abundant. Found in skin, hair, nails, and bones. Best for skin and anti-aging.
Type II: Found in cartilage. Most relevant for joint health.
Type III: Often found alongside Type I. Supports skin elasticity and organ structure.
The Benefits of Collagen Supplementation
Skin health is the most studied and well-supported benefit.
Clinical trials have found that taking hydrolysed collagen can:
Improve skin elasticity and hydration
Reduce the appearance of fine lines and wrinkles
Support wound healing
One large review of studies found that people who took collagen supplements for 8–12 weeks saw significant improvements in skin elasticity and moisture compared to placebo.
Beyond skin, evidence supports collagen for:
Joint pain and mobility: Type II collagen has been shown to reduce joint discomfort, particularly in people with osteoarthritis.
Bone density: collagen makes up a large part of bone structure. Some studies show it can slow bone loss in post-menopausal women.
Gut health: collagen contains the amino acid glycine, which helps support the gut lining, potentially helpful for people with leaky gut.
Muscle mass: when paired with resistance training, collagen protein can help maintain and build lean muscle, particularly in older adults.
Does It Actually Work for Skin?
Yes, with caveats. The research is very promising, but it's worth setting realistic expectations.
Collagen isn't going to reverse decades of ageing. What it can do with consistent use over months is support your skin's structure from the inside out.
The mechanism makes sense: collagen peptides from supplements are absorbed and then signal fibroblasts (the cells that make collagen) to produce more of it.
They also act as building blocks your skin can use directly.
Collagen comes in several forms:
Powder (hydrolysed collagen / collagen peptides): The most popular and well-studied form. It dissolves easily in hot or cold drinks, has little to no taste, and is well-absorbed. This is the form used in most research studies.
Capsules/tablets: Convenient but you'd need a lot of them to match the dose in a single scoop of powder.
Liquid collagen: Pre-mixed drinks or shots. Effective but often more expensive.
Gummies: The least reliable as it's typically lower in collagen content and higher in sugar.
For skin benefits, marine collagen (from fish) is often highlighted as particularly bioavailable, meaning the body absorbs it more easily than bovine (cow-derived) collagen.
Dosage
Most studies showing skin benefits used 2.5–10 grams of hydrolysed collagen per day. For joint health, studies have used up to 10–15 grams daily.
Collagen is best taken with vitamin C. This is important because vitamin C is essential for your body to actually synthesise collagen.
Many collagen supplements already include it; if yours doesn't, take it alongside a vitamin C-rich food or supplement.
Side Effects
Collagen is very well-tolerated. Side effects are rare and usually mild:
Digestive discomfort (bloating or a feeling of fullness) at higher doses
A lingering aftertaste with some marine collagen products
Allergic reactions in people with fish or shellfish allergies (if using marine collagen)
There are no known serious risks with standard doses. It's also safe during pregnancy, but as always, check with your doctor.
FAQs
1. How long before I see results?
Skin improvements are typically noticeable after 8–12 weeks of daily use. Joint benefits may take a bit longer. For example, some studies ran for 6 months.
2. Is bovine or marine collagen better?
Marine collagen is often cited as more bioavailable and is a good source of Type I collagen, making it popular for skin.
Bovine collagen contains both Type I and III and is a solid all-rounder. Both work but the best one is the one you'll actually take consistently.
3. Can vegans take collagen?
Traditional collagen supplements are always animal-derived.
'Vegan collagen' products don't actually contain collagen because they contain nutrients (vitamin C, zinc, silica) that support your body's own collagen production. Some people find these helpful, but the evidence base is not as strong.
References