Hair Theory Lab
Hair Theory Lab Shampoo & Treatment Travel Set, 30ml, 30ml
Hair Theory Lab Shampoo & Treatment Travel Set, 30ml, 30ml
Repair frizz and damage with hair science. Achieve your ideal hair.
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• Authenticity guaranteed.
• Ships direct from Japan in 3-5 days
• Custom duties & tariffs fully handled by us for US customers.
• Track your order via USPS, Royal Mail, Canada Post, Australia Post.
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What it is
A set of Serum-in Shampoo & Serum-in Treatment. Formulated with "Tostea(R)," a next-generation "hair repair and frizz control ingredient," it repairs damage from within the hair. Furthermore, beauty ingredients that focus on hair density support manageability, elasticity, shine, and moisture. By using the shampoo and treatment together, it transforms frizzy and dry hair into smooth, manageable, and shiny hair from root to tip. Serum-in Shampoo: Gently cleanses hair and scalp while repairing damage. It moisturizes from within the hair, leaving it smooth to the touch. Serum-in Treatment: Repairs from the inside of the hair to the cuticle, caring for frizz and dryness. It leaves hair smooth and shiny from root to tip.
Ingredients
How to use
(1) Before shampooing, pre-wash your hair to remove any styling products. Then, apply an appropriate amount to your hair, lather, and rinse thoroughly. (2) After shampooing, lightly remove excess water from your hair and apply an appropriate amount of conditioner. Leave it on for 2-3 minutes to enhance absorption! Then rinse thoroughly.
We ship internationally from Japan!
Frequently Asked Questions
Are the products you sell authentic?
Authenticity is 100% guaranteed. We source directly from the brand, or from official stores within Japan.
All products are fresh off the shelves and never outdated.
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.