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If you’ve been following along, you know by now there are a few K18 products that have genuinely changed my hair game. Because of that, I’ve slowly been working through their entire product lineup to see how it compares to other brands in the same category. Last Month I shared my thoughts on K18 Leave-in Molecular Repair Hair Mask.
I’ve slowly been testing the K18 lineup piece by piece. K18 Molecular Repair Hair Oil is not something I was exactly busting at the seams to try. I don’t like oils in general, so this one took me a while to warm up to.
Up until now, when I did use hair oil, it was usually Olaplex No. 7 Bonding Hair Oil. Mostly because I already had it and I’ve seen my hairdresser use it on me. It works, but I always find it a bit heavy and unmistakably oily. Sometimes I’d scrunch a towel into my hair just so it didn’t feel so slick.
I wish I didn’t mind the oiliness of oils. Unfortunately, that’s usually the thing that bothers me most about them.
My Hair Situation (Context Matters)
I didn’t wake up one day blonde. I eased into it slowly.
Highlights turned into balayage, which eventually turned into scalp bleaching and a more lived-in blonde. Over time, damage happened because at the end of the day, it’s still chemicals on my head.
I went from a natural level 2 to about an 8 or 9.
My hair is still very straight and coarse, but dryness shows up mostly at the ends rather than near the scalp. Because of that, my hair can tangle easily, especially when it’s compromised. That’s the baseline I’m working from whenever I try any kind of repair product.
What K18 Claims to Do (Briefly)
K18 Molecular Repair Hair Oil is marketed as both a repair treatment and a styling oil.
According to the brand, it uses their K18Peptide to reconnect damaged keratin structures inside the hair fiber. The idea is that repairing damage internally can help improve strength and elasticity instead of simply coating the hair so it looks smoother temporarily.
At the same time, the oil is meant to smooth the outer layer of the hair to reduce frizz and flyaways.
K18 also claims the oil can help minimize the appearance of split ends and protect hair from heat up to about 450°F. It can be used on damp hair before styling or on dry hair as a finishing oil to smooth things down.
How I Actually Use the K18 Molecular Repair Hair Oil
I do use this oil differently than recommended. However, I suggest starting with what K18 suggests and figure out what works best for you.
Step 1: I roll the bottle in my hands. I don’t shake it. The bottle doesn’t say to, but I’m old school and feel the need to “warm it up.”
Step 2: I unscrew the dropper and give myself 4 drops in the palm of my hand
Step 3: I rub the palms of my hands together, but not in a crazy way. Just to spread out the product.
Step 4: I start at my roots and apply upward towards my scalp, but never on my scalp
Step 5: This is when I can be done. But sometimes, during the cold Michigan winters, I will go in again, but with only 2 drops and repeat.
Again, nothing exotic. Very straightforward with room to develop your own application relationship with this product.
Results I Noticed Over Time
The first thing I noticed was that this was an oil I didn’t hate.
I didn’t feel the need to scrunch a towel before applying it, and I don’t feel the need to wash my hands immediately after using it. I genuinely wasn’t expecting that because oils usually bother me.
The oil does give my hair a bit of extra shine. I’ll be honest, shine isn’t something I chase. I care much more about how my hair feels while it’s growing out of my head. Still, there is a noticeable visual boost when I use this.
Another thing I noticed is that the usual fear of my scalp feeling oily never shows up. Even though I never apply oils near my scalp, other products sometimes migrate there throughout the day. That hasn’t happened with this one.
K18 Molecular Repair Hair Oil is remarkably light. Four drops is usually enough for my hair, which is long, coarse, and bleached.
Who I Think K18 Works Best For
When I first started using this oil, I used it every time I washed my hair just so I could see how it behaved.
Over time, I realized the oil works best for me when I know I’m going to use a curling iron or a straightener.
I know K18 Heat Bounce is the product they push specifically for heat protection, but sometimes that product can feel a bit heavy on my hair. So instead of reaching for Heat Bounce, I’ll use the Molecular Repair Hair Oil.
It’s mostly a preference thing.
If you’re someone who generally doesn’t like hair oils, you might actually be pleasantly surprised by this one.
I would recommend this product to someone who normally avoids hair oil but still wants that extra bit of care for damaged or bleached hair. It has a place in my routine, but whether it feels essential probably depends on what other styling products you already use.
Is It Worth the Price?
I opted for the mini size first just to see how I felt about it.
The K18 Molecular Repair Hair Oil comes in two sizes. The full size (30 ml) is $65, and the mini size (10 ml) is $27.
The only reason I’m even considering the full size is because the mini bottle is so small that it sometimes disappears in my makeup bag. I’m not exactly known for keeping my counter organized.
That said, I do think the product is worth the investment if you’re looking for something that adds shine while also acting as a lightweight heat protector.
A little goes a long way with this oil.
Where It Fits in My Blonde Routine
K18 Molecular Repair Hair Oil fits into my routine for one very simple reason: it makes me comfortable using it.
I’ve said it a few times already, but I really don’t like oils. The fact that this product doesn’t leave me with the same heavy, slick feeling that most oils do is a big deal for me.
That alone earns it a spot in my lineup.
The Grounded Verdict
Part of being Medium Maintenance is being comfortable with the products you actually use.
This kind of hair oil makes the cut for me.
Considering the current economic climate, I’d probably purchase the Molecular Repair Hair Oil before I’d repurchase Heat Bounce specifically for heat protection. That’s simply based on how my hair responds and how I prefer my hair to feel.
Your mileage may vary, but for someone who normally avoids oils, this one surprised me. Next month, I will be sharing my experience with K18 Astrolift Reparative Volume Spray.
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