ISSHI
Isshi Hair Pack Serum, 180g (Hopeful Flower)
Isshi Hair Pack Serum, 180g (Hopeful Flower)
@cosme rating: 5.1/7.0
At-home Kantan Acid Heat Treatment, Hair Pack Serum for Curly 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
"Isshi" has launched a counterattack against the formidable enemy known as "curly hair." For those who continue to deal with frizzy and wavy hair through salon straightening, acid heat treatments, and morning hair ironing, you're sacrificing many things: hair damage, money spent on salon visits, and precious morning preparation time. ISSHI Hair Pack Serum is the answer to "curly hair repair" without sacrificing these things. This hair pack serum contains glyoxylic acid, which is also used in the popular acid heat treatments at hair salons, in a way that makes it easy to use at home. Daily care will give your hair bounce and strength from the inside, treating damage and making it easier to manage. Easy acid heat treatment at home.
Ingredients
Water, cetanol, glycerin, cyclopentasiloxane, pentaerythrityl tetraethylhexanoate, sorbitol, PPG-1/PEG-1 stearamine, stearyl alcohol, BG, glyoxylic acid, isostearoyl hydrolyzed collagen, cholesterol (wool), quaternium-33 (wool), hydrolyzed keratin (wool), amodimethicone, cyclohexasiloxane, cyclotetrasiloxane, behentrimonium methosulfate, steartrimonium chloride, stearamidopropyl dimethylamine, hydrogenated polyisobutene, octyldodecanol, dimethiconol, dimethicone, DPG, tocopherol, lactic acid, sodium hydroxide, PEG-30 phytosterol, isostearic acid, phenoxyethanol, methylparaben, propylparaben, caramel, fragrance
How to use
<Daily Care> After shampooing, apply an appropriate amount to your entire hair. After about 3 minutes, rinse thoroughly. Then, use your favorite treatment as usual. <Special Care (about once a week)> After shampooing, apply an appropriate amount to your entire hair. Then, wrap your hair in a hot towel for about 20 minutes. After rinsing thoroughly, use your favorite treatment as usual. After use, pull your hair down and blow-dry it with a hairdryer. The heat will give your hair even more shine and straightness.
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.
I get my hair straightened every 8-10 months, and when my hair grows out and starts to get wavy, I use this! It's great because it keeps the waves and frizz down.
I'm worried about the smell, which is similar to that of coloring agents.
I bought a single-use pouch to try out. I was curious about the smell, but there was no unpleasant odor at all. I figured I wouldn't notice it after just one use, but my hair was noticeably smoother after using the hair dryer. I'd like to buy it again this season when dryness is a concern.
The finish is light. It doesn't completely eliminate frizz, but I found it to be easier to manage the next morning.
I tried the single size for the first time. My hair is wavy, has split ends, breakage, is dry, and unmanageable, but I just used a hair dryer and it's smoother than usual. However, there are still some areas of my hair that remain wet no matter how long I use the hair dryer, and there was no improvement in those areas. I'll decide whether to repurchase depending on how long this smoothness lasts.