Hair Theory Lab
Hair Theory Lab Hair Milk Serum, 95ml
Hair Theory Lab Hair Milk Serum, 95ml
Experience deep hydration with this hair milk born from hair science.
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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
[Our goal: A 14% "absolute moisture balance"] Intensive repair of three layers of damage. It restores the ideal moisture balance of hair, resulting in a silky smooth feel. Collagen, with its small molecules and high penetration power, and ceramide NG, which is naturally present in hair, are used to target "cavity damage." Furthermore, these two ingredients are penetrated as quickly as possible to prevent evaporation. Four types of hyaluronic acid are injected into the damage holes. A special wrapping technique seals the hyaluronic acid into the damage holes. Care for damaged and peeled cuticles. A technique is employed to replenish the fatty acids that bond the cuticles together and further strengthen their adhesion when exposed to heat from a hairdryer or iron.
Ingredients
How to use
Gently remove excess water with a towel, then apply the product from the inside of your hair to the rest of your hair before using a hairdryer.
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All products are fresh off the shelves and never outdated.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.