TRUEST
Truest by S Free Acid Heat Treatment, 480ml
Truest by S Free Acid Heat Treatment, 480ml
@cosme rating: 4.2/7.0
Acid heat treatment hair care for silky straight 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
This treatment contains acid-heat treatment ingredients. Experience salon care at home, repairing severe damage deep inside your hair. It leaves your hair feeling reborn, smooth and manageable, and silky to the touch.
Ingredients
Water, stearyl alcohol, glycerin, honey, behentrimonium chloride, dimethicone, glyoxylic acid, levulinic acid, hydrolyzed keratin (Cashmere Goat), Hydrolyzed Silk, Hydrolyzed Keratin, Silk, Gamma-Docosalactone, Hematin, Haberlea Rhodopensis Leaf Extract, Ceramide 2, Ceramide 5, Ceramide 3, Ceramide 6II, Ceramide 1, Yeast Extract, Beet Root Extract, Mandarin Orange Peel Extract, Olive Leaf Extract, Opuntia Streptacantha Extract, Melissa Officinalis Leaf Extract, Wild Thyme Extract, Caprylic/Capric Triglyceride, Distearyldimonium Chloride, 1,2-Hexanediol, Caprylyl Glycol, Quaternium-33, Cholesterol, Isopropanol, Hydroxyethylcellulose, Amodimethicone, Dicocodimonium Chloride, PEG-55 Stearate, Cyclopentasiloxane, Aminopropyl Dimethicone, Steartrimonium Chloride, Propylene Glycol, Butylene Glycol, Alcohol, Phenoxyethanol, Fragrance
How to use
Take an appropriate amount in your palm and apply it to your entire hair. Leave it for 2-3 minutes, then rinse thoroughly to ensure no residue remains. After towel drying, blow dry your hair with a hairdryer while combing through your fingers.
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.
It was a bit rough when I washed it, but it became smooth. The scent seems to be a matter of personal preference.
For amazingly smooth, tousled hair! Truest by S-Free Acid Heat TR Shampoo & Treatment Premium. This premium version of Truest by S-Free Acid Heat TR Shampoo & Treatment, which received an A rating from LDK the Beauty, boasts double the repair keratin for even more power. Its denser texture provides intensive repair for highly damaged hair. It leaves hair smooth and manageable, with a glossy finish. The gorgeous, translucent white freesia scent is perfect for my highly damaged hair. With continued use, the damage is less noticeable, and I'm now able to enjoy styling my hair in ways other than updos. The smooth finish is a delight, and the lovely white freesia scent makes bath time a truly enjoyable experience. The cute packaging is also exciting! @truest_by_sfree #truest #truest #acidheattreatment #touslysmoothhair #softandglossyfallwinterhairrecipes
As the reviews said, it was neither good nor bad. I didn't feel like it had to be this way.
[Testing 200 Shampoos] No. 73 Thank you so much for always reading! Following me encourages me to keep posting ★ 20s Hair Type: Thick/Strong and bouncy, semi-long/Bleached hair (5 or 6 times) I really love the finish of this shampoo!! This shampoo is supposed to be a night fragrance that can be enjoyed by all genders, but...it has a calm night musk scent, which is quite distinctive. It's probably a matter of personal preference, but I'm okay with it. As for the finish, it's pretty average when I use it in the bath. It just lathers a little. However, when I dried my hair after the bath, I was amazed! My hair became so smooth, it was so straight I wanted to touch it forever!! I no longer have to worry about frizz. It doesn't even frizz at all! This is a shampoo I want more people to use!!
I only use the treatment. First of all, I love the scent. After using a hair dryer, my hair is shiny and smooth, like I've just come back from the salon! The next day, the frizz and frizzy surface of my hair is much better than when I use other treatments lol. I love it so much that I keep using it, and recently I even bought the mini size for travel!