COA
COA Core Silk Treatment, 100ml
COA Core Silk Treatment, 100ml
Rated 4.0 out of 7.0 by Japan’s largest beauty community
It blends into your hair instantly, leaving it smooth and shiny like silk.
✓ 100% AUTHENTIC, SHIPS FROM JAPAN
✓ DUTIES & TAXES INCLUDED FOR US ORDERS
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What it is
The water-like texture blends instantly into your hair, leaving it silky, smooth, and shiny. Improve your hair quality at home. . The water-like texture blends in instantly, so you don't have to leave it on. . The light texture leaves hair smooth and shiny without stickiness. . The fine molecules create a veil for long-lasting moisture (we recommend using it 2-3 times a week).
Ingredients
PG, Ethanol, Water, Coco-Caprylate/Caprate, Steartrimonium Chloride, PEG-60 Hydrogenated Castor Oil, Behentrimonium Chloride, Polyquaternium-7, Sodium Benzoate, Rice Germ Oil, Tocopherol, Haematococcus Pluvialis Oil, Helianthus Annuus (Sunflower) Seed Oil, Isopropanol, Noxyethanol, Fragrance
How to use
1. After shampooing and conditioning, thoroughly drain the water. 2. Apply directly to your hair without using your hands. Apply mainly to the ends of your hair, taking care not to get it on your scalp. 3. After applying, massage/comb your hair and once it has warmed up, rinse. We recommend using it 2-3 times a week.
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.