COSME DECORTE
COSME DECORTE AQ Boosting Treatment Hair Serum, 200ml
COSME DECORTE AQ Boosting Treatment Hair Serum, 200ml
@cosme rating: 5.5/7.0
The answer is "introduction serum" for hair. Penetrates and repairs to the core of the hair.
✓ 100% authentic
✓ Ships from Japan in 3-5 days
✓ Duties prepaid for US orders
✓ Tracked delivery via Japan Post
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What it is
The answer is "introducing beauty serum" for hair. A new hair serum born from the wisdom of skin science research that penetrates and repairs the core of the hair. Penetrates and repairs the core of the hair, leaving it smooth and manageable all the way to the ends. A water-based hair serum to be used before treatment as an introductory beauty serum for your hair. This special care treatment hair serum penetrates the inside of damaged hair with luxurious moisture, repairing damage caused by dryness, coloring, friction, etc. It leaves your hair moisturized and smooth all the way to the ends.
Ingredients
How to use
Use approximately 2-3 times a week. After shampooing, lightly drain the water and apply 1-2 pumps directly to areas of concern, working in. (For semi-long hair, 4 pumps is the recommended amount. If you are concerned about damage, use more depending on the condition of your hair.). Leave it on for about 10 seconds, then apply your usual conditioner or treatment without rinsing. Rinse after this. *If you are finishing with this product, rinse without applying conditioner or treatment.
We ship internationally from Japan!
Frequently Asked Questions
Is this authentic?
Yes. We only buy from official retailers and directly from the brands here in Japan. Never resellers, never grey market stock.
We are beauty lovers too, so we know the worry, especially with something you are putting on your face. Authenticity is 100% guaranteed by us.
What are your shipping rates?
On orders under US$75, shipping is a flat US$20 to the United States and US$10 to all other countries.
Orders of US$75 or more ship free, applied automatically at checkout. Your exact shipping cost is shown before you pay.
How long does delivery take?
These estimates are for International Airmail (Tracked) and include 3 to 5 business days of processing in Japan.
- United States: 12 to 15 business days
- Canada, United Kingdom, France, Germany: 9 to 12 business days
- Australia, New Zealand, Denmark, Finland, India, Indonesia, Italy, Netherlands, Spain, Sweden, Switzerland: 10 to 13 business days
- China, Hong Kong, Malaysia, Singapore, South Korea, Taiwan, Thailand, Vietnam: 8 to 10 business days
- Rest of the world: 11 to 18 business days
Actual delivery can be affected by customs clearance, seasonal congestion, or carrier delays in the destination country, all of which are outside our control.
Do you offer express shipping?
Yes. As of 22 July 2026, we offer International Express Mail through Japan Post. The cost is based on order weight and is calculated automatically at checkout.
Will I pay customs or import fees?
US orders: No. As of July 1, 2026, all US orders ship DDP (duties delivered prepaid), meaning we prepay all import duties on our end. Nothing is due at your door.
Orders outside the US: Possibly. Duties and import taxes are set by your local customs authority and are not collected at checkout, so any charges on delivery are your responsibility.
We're working on rolling out prepaid duties for more countries soon.
I had been interested in this treatment for a long time but had never bought it, so I finally decided to give it a try and it was an amazing treatment! Since using this treatment, I wonder if my hair quality has improved? It has become so beautiful!!
The most shocking purchase of 2024 Shampoo → Hair serum (this) → Treatment Just one extra step in your normal hair wash will really make your hair smooth. The best way to use it for me is to squeeze the water out of your hair after shampooing and then use this product. 5-6 pumps for semi-long hair (use on the whole hair). It's watery, so apply it to your hair with each pump and comb it so that it blends in well. After that, apply the treatment and comb it again, leave it for a while, then rinse it off. This is all it takes to make your hair as shiny and smooth as if you just came back from the salon. The first time I used it, it was a shock.
I suddenly wanted to make my hair look beautiful, so I've been trying out a lot of products with good reviews. This is easy because I only need to use it 2-3 times a week, and I was surprised that after drying my hair with it, it looked shinier than usual! I'll continue using it and see if I want to buy it again, but so far it seems good!
This is a repeat purchase. It makes my hair smooth. I use it as a special weekend treatment.
I bought this as a gift for a friend. It seems to be really good. It's AQ, after all! I've used their lotion countless times, so I'd like to try it myself when the time comes.