There's one question I hear in almost every consultation: "Tatiana, does drinkable collagen actually do anything for my skin?"
It's a fair question. Collagen powders, shots and gummies are everywhere, and the promise sounds so logical: skin loses collagen, so let's put some back in. So I went to the research, and to my notes from a course with physiologist Irina Kapustyana, PhD in Biological Sciences. Here's what I found, and what I tell my clients.
What happens when you drink collagen
First, a little reality check: collagen doesn't travel from your glass straight into your face. It's a protein, so your digestive system breaks it down into small pieces (peptides) and single amino acids. These are building blocks your body uses to make its own proteins.
And your body decides where they go. As Irina Kapustyana explains, they go first to wherever protein is most needed: cartilage, ligaments, muscles, and skin too. How much actually reaches your skin is impossible to predict.
But there's a second, more interesting theory. Some of those small collagen fragments can travel through the bloodstream to the skin and act as signal peptides. Think of them as a little message to your fibroblasts (the cells that make collagen): "Hey, we're broken pieces of collagen, so something must be damaged here. Time to build new collagen!"
It's a beautiful idea, and lab studies support parts of it. But whether it creates a visible difference in real skin depends on many things: whether you get enough protein overall, how healthy your gut is, and the quality of the collagen itself.
What the newest research says
You've probably seen headlines like "Science proves collagen works!" They usually point to two big reviews from 2021 and 2023, which combined many small studies and found better hydration and elasticity.
In September 2026, two researchers, biostatistician David Robert Grimes and dermatologist Dr Anjali Mahto, took a closer look at those reviews. They published their findings in the Journal of Cosmetic Dermatology. What they found:
- The numbers didn't add up. Data had been copied incorrectly, and very different measurements were mixed together as if they were the same thing.
- More collagen didn't mean better results. If collagen truly worked, a higher dose should give a bigger effect. It didn't. Doses ranged from 0.3 g to 10 g a day, with no difference.
- Positive results came from industry-funded studies. The independent studies found no benefit.
Once the errors were corrected, the benefit disappeared. Their conclusion: right now, there's no reliable proof that drinkable collagen improves skin.
The researchers also point out something important. People who buy collagen often also use SPF, retinoids and good serums. So when their skin looks better, collagen might not be the reason.
So, should you drink it? My honest take
Here's what I tell my clients: it won't hurt, it's a protein source, but don't expect miracles, and don't skip what's proven.
If you enjoy your collagen drink and it fits your budget, there's no reason to stop. It adds protein to your day, and the signal-peptide theory may still turn out to be right one day. If you do try it, give it at least 8–12 weeks.
But if you're choosing where to spend your money and energy, put collagen at the bottom of the list. Here's what deserves the top.
What really supports your own collagen
Your skin already knows how to make collagen. Our job is to give it the right materials and protect what's there. Here's where the real evidence is.
1. Enough protein, every day Your body can't build collagen without building blocks. Fish, eggs, legumes, dairy, tofu and meat all provide them. If your diet is low in protein, this is the first thing to fix, and it may be why some people do notice a difference with collagen powder.
2. Vitamin C, the collagen co-pilot This is the one people forget. Your fibroblasts (the small "builder" cells deep in your skin that produce collagen and elastin) simply cannot make stable collagen without vitamin C. It's an essential helper in the process that links collagen fibres together. Without it, collagen is weak and falls apart quickly. Vitamin C works on two levels:
- From the inside: peppers, citrus, kiwi, berries, broccoli and leafy greens keep your levels topped up.
- On the skin: a well-formulated vitamin C serum supports collagen production, brightens and protects against free-radical damage from UV and pollution. Apply it in the morning, under your SPF.
3. SPF, when your skin needs it UV light is the biggest destroyer of collagen. No drink can outpace sun damage. My rule of thumb: apply SPF whenever the UV index is 3 or higher (your weather app shows it). If you use retinol, make it daily, since retinoids make skin more sensitive to the sun. Living in northern Europe? In the darker winter months, the UV index often stays below 3, so daily SPF isn't necessary then.
4. Topicals with proven results Retinoids (vitamin A) are the best-studied ingredients for stimulating your own collagen. They need patience, though: the real, visible transformation shows after about 6 months (24 weeks) of regular use. That's when research finds:
- Up to 30% reduction in wrinkle depth
- Higher collagen density in the deeper skin layer
- More even thickness of the outer skin layer
- Less dull, "yellowish" tone
- Stronger collagen fibres
Curious how to start retinoids without irritation? Read my full guide: Retinoids: Why Irritation Happens and How to Use Them Correctly
Peptides and growth-factor-inspired formulas support the same goal, and are a lovely option for sensitive skin.
5. Professional treatments Treatments such as microcurrents, microneedling or chemical peels can activate your skin's own repair processes, especially when combined with a good home routine.
Quick answers
Is marine collagen better than bovine?
- Marine collagen is often called the best absorbed. There are hints, but no strong independent proof yet. If you take collagen, choose a trusted brand with clear quality testing, whatever the source.
How long until I see results?
- Most studies run for 8–12 weeks. If you notice nothing after three months, it's fair to stop.
Can I just eat collagen-rich foods instead?
- Yes. Bone broth, fish with skin, or gelatine provide the same building blocks. A protein-rich, colourful diet covers most of what your skin needs.
Should I take vitamin C with my collagen?
- Vitamin C is essential for making collagen, so getting enough is always a good idea, from food or a supplement. On the skin, a vitamin C serum works directly where you want it.
Want to know what your skin really needs? Book an online consultation and let's build your routine together.
Sources
- Grimes DR, Mahto A. Hydrolyzed Collagen for Skin Aging Meta-Analyses Are Unreliable. Journal of Cosmetic Dermatology, 2026; 25:e71208. doi.org/10.1111/jocd.71208
- Course "Physiology for Beauty Therapists": Irina Kapustyana, physiologist, Candidate of Biological Sciences.
