LITTLE ROCK, Ark. (KTHV) – It is one of the top selling supplements in the country and some doctors are even recommending it to their patients to help with joint pain and hair loss.

Collagen claims to help with your hair, skin and nails. For 45, Anne Birchard has been selling all different types of supplements to her customers. But lately, she said collagen is what is flying off her shelves.

"It's a form of protein from the collagen from an animal called Bovine,” Birchard said.

You can find collagen in all different types of forms: powders, liquids, pills and creams. Birchard said her customers rave about it.

"I could tell within about two weeks my skin had a glow to it, it didn't ordinarily have. For me that's pretty good, I'll be 50 next year," Rory Hill said.

Hill said collagen does not have much taste to it at all.

"I took the liquid form. I took it in the morning time before breakfast. I've had some in powder where I would mix it into a smoothie and take it on the run,” Hill said.

You can take collagen however you like, but one of the most popular ways of consuming it is using it as a creamer in your coffee.

“I put mine in my water. It tastes good,” Birchard said.

We already have collagen in our skin, but physician Constance Crisp said as we get older we start to lose it - leading to unwanted wrinkles.

"People always want better skin, less joint pain, better hair, all of those things collagen can help with that,” Crisp said.

Crisp said there are certain types of collagen that work better. She recommends looking out for type 1 and 2 collagen to get the most bang for your buck.

"Collagen hydrolysate is a specific form of collagen peptides that are bioactive, meaning the body can easily absorb them,” she said. "Those are the ones that help the bones, and joints and all of that as well as the skin."

Crisp said there is no harm in trying collagen. She said she thinks it can be helpful, but there is not necessarily a guarantee that it is going to work.

“Taken the right way and not too high of a dose it’s safe,” Crisp said.

Crisp recommends not taking more than seven grams of collagen a day because too much of it can lead to kidney stones. She said to stick with the recommended amount on the packaging.

“One of the first things I noticed is one of my patients came in and her skin looked amazing and she said the only thing she had done differently is she started taking collagen supplements,” Crisp said.

So, if you're looking for something to give you a boost, it might be worth giving collagen a shot.

"Even people during the winter time, when they have dry lips, a lot of times collagen will even help that. I can go on and on,” Birchard said.