To really encourage length, you have to think of it in two steps: Stimulating growth and keeping the hair you do have healthy. The latter involves many of your standard hair care lessons, but the former takes a bit more work: You have to go internal. Here, seven science-backed tips to encourage hair growth—no matter your length goals:


1. Clean and stimulate the scalp.
If you're looking for hair growth, start at the source: the scalp. First off, a chronically inflamed scalp—caused by scalp tension, buildup, oxidative stress, and scalp conditions like dermatitis—can lead to hair loss or thinning. In fact, one study showed that inflammation caused by pollution and oxidative stress is one of the main causes of hair loss in adults.
2. Take hair-growth supplements, like collagen and biotin.
These two ingredients help promote hair health and growth by providing the body with all the right nutrients. Hair is made of the protein keratin, which has an amino acid profile including cysteine, serine, glutamic acid, glycine, and proline.
Both collagen and biotin supplements have high amounts of many of these amino acids, meaning the supplements provide the body with the building blocks of hair.* Research backs this up, too, as studies show taking these supplements supported hair growth.*
3. Protect it from physical damage.
This doesn't necessarily encourage growth, but it does protect the hair length you already have. Physical damage—caused by daily wear and tear, harsh brushing, or the shower—leads to breakage. And while the occasional snapped strand is perfectly normal, having breakage-prone hair can make achieving your length goals nearly impossible.
4. Keep it moisturized.
"The hair on your head is probably the driest thing on the body, and if you are trying to grow it longer, you need to keep it moisturized," says hairstylist Anthony Dickey. "If your texture is naturally drier, it is even more essential to keep hair hydrated. Dry hair turns to brittle hair and brittle hair breaks."
5. Use antioxidants.
Hair ages just like the rest of your body: This is why people experience hair thinning as they get older. It also limits the speed at which your hair grows. One way that research has shown to help hair aging is antioxidants, as they manage oxidative stress and neutralize free radicals.* Make sure you eat foods high in antioxidants or add a vitamin-rich supplement to your diet.* "Your body needs adequate nutrients to support healthy hair," says registered dietitian Jessica Cording, M.S., R.D., CDN, "Vitamin C, for example, plays a really big role in promoting collagen production and that helps strengthen hair."*
6. Wear protective hairstyles.
While any tip on this list is applicable for any hair type, those with textured, natural hair also likely need to wear protective styles from time to time. "The journey going from short to long hair can feel daunting," says Branch. "But protective hairstyles are wonderful for growing hair out, transitioning between two different hair textures (i.e., textured versus straightened), minimizing the daily hair routine, covering the ends of hair, and safeguarding natural hair against harsh seasonal elements and damaging environmental factors." A few examples she recommends: flat twists, cornrow ponytails, and box braids. "But switch these out every two weeks and give yourself breaks between them," she says to avoid scalp tension, which can lead to traction alopecia, a medical condition in which chronic too-tight hairstyles causes hair loss.
7. Give daily heat styling a break.
If you are looking to strengthen and grow your hair, you cannot use hot tools daily. Heat styling works by breaking down the hydrogen bonds in hair—that's how it restructures and restyles your hair pattern (be it straightening curls or adding curls to straight hair). And when you do this too much, it causes damage. One study found that regular styling with hot tools significantly decreased moisture content and increased breakage. If you do use a hot tool, make sure to use a heat protectant that can stand the heat: Look for something that will protect up to 400°F (how hot some blow dryers and irons can get) or if you use natural oils, the higher the smoke point, the better.
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