Hair oils have long been praised for their ability to hydrate, smooth, and add shine to hair—but K18’s molecular repair hair oil takes things a step further. Clinically proven to repair damage, reduce split ends, and protect hair from heat up to 450°F, it’s a multi-functional powerhouse that does it all.

“Our hair oil is one of the most versatile products in your routine, and it’s easy to use on all hair types,” says Amber Thorne, K18’s Director of Education Development. “Whether you’re using it to hydrate, protect, refresh, or style, a little oil goes a long way—but applying it correctly is key to getting the full benefits.”

Here, Thorne breaks down the best way to use the oil, along with some unexpected uses that might surprise you.

the right way to apply molecular repair hair oil

One of the standout features of molecular repair hair oil is how buildable it is. “You don’t need to go all in on the first application,” says Thorne. “Start with just a few drops—about 2-3—and rub the oil evenly between your hands and fingers. Then, apply it to the back of your hair first, working from the mid-lengths to the ends.”

Why start at the back?

The back of your hair tends to absorb less oil, making it the perfect place to begin for an even distribution. Once the back is covered, move to the front, applying the oil from the ends toward the scalp. “Your scalp already produces oil, so focus most of the product on the mid-lengths and ends,” says Thorne.

reapplication: more than just a one-time thing

Stylist tip: Reapplication is key. “Professional stylists reapply oil throughout the styling process to ensure even distribution and a fresh, nourished feel,” explains Thorne. “Instead of loading your hair with oil all at once, start by prepping your hair with a little oil, then reapply before using any heat tools.”

Because the oil is lightweight and designed to absorb fully, you don’t have to worry about residue or buildup, even on processed hair.

unexpected ways to use hair oil

While K18’s molecular repair hair oil is most often used for hydrating, taming frizz, and adding shine-slash-protection during heat styling, its versatility means it can be a game-changer in several situations. 

Here are some of Thorne’s favorite unexpected uses:

• mid-day refresh

Just like you might use face oil over makeup, hair oil can be a quick fix for mid-day hair fatigue. “If your hair looks dull or needs a moisture boost, a few drops in the mid-lengths and ends will instantly revive shine and hydration,” says Thorne. This is a great way to refresh your hair between washes without weighing it down.

• boost curl definition

Hair oil is great for redefining curls on the fly. “Applying a small amount as a styling product can help retrain curls, keeping them bouncy, frizz-free, and defined without the crunch,” says Thorne.

• before bed

A personal daily tip from Thorne is to use the oil as part of your bedtime routine: “I love to apply a little oil to the mid-lengths and ends of my hair before tying it in a loose, protective style like a scrunchy. By morning, my hair is soft, moisturized, and ready to go. Plus, there’s no residue on the pillow.”

• beach day protection

Heading to the beach? Apply a small amount of oil to the ends of your hair before you hit the sand or swim. “The oil acts as a protective barrier against the sun and sea salt, keeping your hair hydrated and preventing damage.”

• travel companion

 “On long flights or when traveling to dry climates, you can take your hair oil along in a travel-friendly size,” says Thorne. “It’s the perfect way to combat dryness and keep your hair feeling smooth and nourished while on the go.”

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