STEPHEN KNOLL
Stephen Knoll Deep Renew Booster Oil, 80ml
Stephen Knoll Deep Renew Booster Oil, 80ml
@cosme rating: 5.0/7.0
A rinse-off hair oil that intensively repairs severe dryness and damage
✓ 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
Thoroughly cares for hair damage caused daily by coloring, heat, etc. A deep-repair hair oil that can be washed off to give luxurious manageability with its dense oil.
Ingredients
Dimethicone, Prunus Amygdalus Dulcis (Sweet Almond) Oil, Argania Spinosa Kernel Oil, Camellia Japonica Seed Oil, Tocopherol, Jojoba Seed Oil, Moringa Prunus (Witch Hazel) Seed Oil, Isostearic Acid, Ethanol, Ethyl Olivate, Neopentyl Glycol Dicaprate, Isopropyl Myristate, Phenoxyethanol, Fragrance
How to use
Recommended use 1-2 times a week. Directions for use 1: After shampooing, mix 1-2 pumps of this product with the Steven Knoll Deep Renew Treatment Mask (about the size of a ping-pong ball), spread on hair, and rinse. Directions for use 2: After rinsing shampoo and hair mask, spread a small amount at a time, focusing on the ends of your hair, and rinse.
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.
Steven Knoll New York Deep Renew Booster Oil delivers intensive care for even the most severely damaged hair ends! Contains the highest concentration of cuticle repair and coating ingredients! This intensive repair treatment restores manageability even to the most dry and damaged hair. Its thick, thick texture feels heavy. [Instructions 01] Mix the treatment mask with the oil. After shampooing, mix 1-2 pumps of Booster Oil into the treatment mask (about the size of a ping-pong ball), apply to hair, and rinse. [Instructions 02] After using your hair mask or conditioner, apply a small amount of Booster Oil to your hair, focusing on the ends, and rinse. (1-2 pumps is the appropriate amount for semi-long hair.) It leaves hair feeling soft and easy to run your fingers through, especially with beautiful shine. Even the most dry and brittle hair is lustrous all the way to the ends. This formula, the same "total damage care" formula as the hair mask, contains the highest concentration of ingredients in the brand that repair and coat the cuticle! Thoroughly cares for dry, tangled hair. Floral woody scent @skny_jp ＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿ #StephenKnoll #DeepRenew #Salon #SalonCare #HairCare #DamageCare #HomeCare #Beauty #Treatment #ShinyHair #RinseOffTreatment #HairMask #ShinyHair #SmoothHair #Dry #BeautifulHair #Bath #BathTime #SmoothHair #HairPack #CurlyHair #BathBeauty #IdealShinyHairRoutine
It suits my hair type and I've been using it for a long time.
I bought this as a set with a hair mask. To be honest, I'm not sure about the effect, but it smells nice. I feel like my hair damage has calmed down.
I mix it with the oil and treatment I use in the bathroom. It adds moisture and feels great.
My first impression when I received it was that it was smaller than I expected. lol However, it might be easy to take with me when traveling or staying overnight. It's a pump type, so it's easy to use, and I mix it with my conditioner, so it's perfect for me, who doesn't like to bother with rinse-off treatments. The scent is also safe, not too strong, so it should be popular with everyone. The feel is neither good nor bad, I guess. I'll keep using it for a while.