Collagen supplements are everywhere right now. Every wellness influencer has a brand. Every coffee shop offers collagen add-ons. And the claims are big: better skin, stronger nails, thicker hair.
So does collagen actually help your hair? The honest answer is: maybe, a little, but not in the way most people think.
What collagen actually is
Collagen is a structural protein — the most abundant one in your body. It’s in your skin, bones, tendons, ligaments. Your hair follicle sits in a collagen-rich layer of your skin (the dermis), and collagen helps maintain the environment around the follicle.
But here’s the thing: your hair itself is not made of collagen. It’s made of keratin, a completely different protein. So when someone tells you collagen “strengthens your hair,” that’s an oversimplification at best.
What the research actually shows
There are a handful of studies suggesting collagen supplementation may improve hair thickness and growth. But most are small, industry-funded, and use proprietary collagen formulas. The independent research is thin.
What collagen does more convincingly: it provides amino acids (particularly proline and glycine) that your body uses to build keratin. So it’s less “collagen makes your hair grow” and more “collagen provides building blocks your body might use for hair.” Might. If those amino acids aren’t being diverted to more urgent repair work elsewhere.
It also has antioxidant properties that may protect the follicle from free radical damage. Interesting, but not exactly the miracle the marketing suggests.
My take from the chair
I’ve had clients swear their hair got better after starting collagen. I’ve had equally many notice no difference. Anecdotal? Absolutely. But after two decades, patterns emerge.
The clients who see the most benefit from collagen tend to be ones whose overall protein intake was low to begin with. If you’re already eating adequate protein, adding collagen probably isn’t going to be the thing that transforms your hair. If your diet is protein-poor, it might help — but so would eating more chicken.
Better bets for your money
If you’re going to invest in supplements for hair health, here’s what has stronger evidence: iron (if you’re deficient), vitamin D (especially in Chicago), omega-3 fatty acids, and adequate overall protein intake.
For topical improvement, K18 does what collagen shampoos claim to do — it actually repairs protein structure in the hair shaft, using a bioactive peptide that reconnects broken keratin chains. The difference is K18 works where the damage is, not just in your digestive system hoping the right amino acids find their way to your follicles.
Should you take collagen?
If it makes you feel good and you can afford it, go for it. It’s not harmful. But don’t expect it to be the thing that fixes your hair if the underlying issues — nutritional deficiency, hormonal imbalance, damage from heat or chemical processing — aren’t being addressed.
Good hair health is about the full picture. Book at Reverie and let’s talk about what your hair actually needs — inside and out.
