Collagen For Hair: 4 Benefits & How To Look For A Hair Supplement*

Collagen is often touted to reduce signs of aging, plump up skin, and add a youthful glow to our complexions.*

Since collagen is the body's most abundant protein and found in connective tissues, joints, and skin, we'd say it's a pretty big deal.*

In addition to the many full-body benefits that often get brought up when discussing collagen supplements, hair health is a common claim as well.*

But what exactly does collagen supplementation do for your mane? After all, hair is made of the protein keratin—not collagen. 

Well, we tapped some top experts to get the scoop on collagen and hair health including what collagen does for the hair, what to look for in a hair supplement, and whether it can, in fact, help with hair growth.* 

As the body of research grows in the world of collagen supplementation, we become more comfortable explaining the benefits of the peptides.

There's pretty substantial evidence in connection with the skin and joints, and increasing studies about bone, muscles, and gut health.* 

However, one area of research that's not as vast is hair health. (It's just not a top priority for researchers at the moment, but that doesn't mean that down the line there won't be more.)

"Collagen is not a component of hair," says Rachel Maiman, M.D., board-certified dermatologist at Marmur Medical. "But the main component of hair, about 95% of it, is the protein keratin." In order for the body to make keratin, amino acids (or building blocks of protein) are necessary. And that's where collagen comes into play.* 

Certified trichologist and founder of Advanced Trichology William Gaunitz, FWTS, says the primary amino acid that is most helpful is called proline1.

It's a physical component of keratin and affects new hair growth. So, in short, collagen peptides that contain proline can help create the protein that makes hair and supports growth.* 

According to Maiman, several studies have found that during the hair's growth phase (known as anagen), the collagen levels surrounding the hair bulb actually thicken and increase.

And as the hair follicle goes into the catagen stage, it sheds two layers of collagen encompassing it.

"As our bodies create more collagen, the layers regenerate. This supports our hair follicles by assisting them in re-entering the anagen phase and maintaining the hair growth cycle,"* she says. 

Collagen may also help reduce the number of gray hairs that appear on your head, according to board-certified dermatologist Hadley King, M.D.

"It's full of antioxidant properties that can help neutralize free radicals2 from UV rays and pollution,"* she says. "It is also theorized that collagen may help protect hair follicles and decrease graying of hair as well."* 

More research to aid this theory: One study found that free radical accumulation in the hair can manifest in loss of color3, or hair graying.

Hair graying is, of course, a natural part of the aging process, but this loss of pigment speeds up in correlation to the amount of oxidative stress the hair follicle is exposed to. 

Just like the presence of collagen improves the health of our complexions, this protein is beneficial for the scalp, too: "Collagen supports the scalp's thickness,"* Maiman says. "A thin scalp with insufficient collagen is less robust and less capable of holding the hair follicle bulbs in place."*

Collagen is by no means the only hair nutrient or supplement to look for. In the same way that skin requires a wide variety of nutrients to look and feel its best, your hair does too.

We recommend making sure you get a robust amount of nutrients in your diet—from food and supplementation—in order to optimize your results. 

There seem to be two competing camps in the hair supplement world: collagen and biotin. Unfortunately, the jury is still out on this one.

Most experts agree that there isn't enough research to prove one is better than the other when it comes to the hair. Collagen helps hair in the ways we suggested above, and biotin is thought to support healthy hair growth because it is involved in the production of keratin9.* 

Ferira shares that, "the collagen-versus-biotin competitive sentiment is invented by humans. In reality, this protein and water-soluble vitamin are not going head to head. They each deliver unique health functions relevant to the beauty realm."

So certainly, you can try both, since biotin and collagen come with a load of beauty benefits including improving skin, nail, and hair health.*

There's still a lot of research to be done on the effects of collagen and hair health, but what we do know is that amino acids are needed in the body to produce a healthy mane.*