Perfect One
Perfect One Medicated Whitening Serum, 90ml
Perfect One Medicated Whitening Serum, 90ml
Rated 5.2 out of 7.0 by Japan's largest beauty community.
Amazing penetration power for radiant, pure white skin
✓ 100% authentic. Direct from brand or official stores only
✓ Ships from Japan in 3-5 days
✓ Duties prepaid for US orders
✓ Track your order via your national carrier (USPS / Royal Mail)
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What it is
Introducing the serum type of the whitening all-in-one gel "Medicated Whitening Gel"! The push-type bottle makes care easy. In addition to the whitening active ingredient arbutin, the vitamin C derivative suppresses the production of melanin and targets the source of age spots. In addition, dipotassium glycyrrhizinate prevents rough skin and promotes healthy skin. *Suppresses the production of melanin and prevents age spots and freckles
Ingredients
Arbutin, L-ascorbic acid 2-glucoside*, dipotassium glycyrrhizinate*, water-soluble collagen solution, water-soluble collagen solution (3), hydrolyzed collagen solution (4), succinyl atelocollagen solution, collagen tripeptide F, isostearoyl hydrolyzed collagen solution (2), hydrolyzed hyaluronic acid, sodium hyaluronate (2), oil-soluble Lithospermum Root Extract (1), Pau d'Arco Bark Extract, placenta extract (1), artichoke extract, neem leaf extract, Scutellaria Baicalensis root extract, seagrass extract, saxifrage extract, coix seed extract, aloe extract (2), Geranium Root Extract, Citrus Pea Extract, Bilberry Leaf Extract, Alpinia Katsumadai Seed Extract, Rosa Izayoi Extract, Thyme Extract (1), Plantain Seed Extract, Prunus Mume Fruit Extract, peony extract, carrot extract, Swertia japonica extract, Alpinia speciosa leaf extract, cherry leaf extract, fermented pear juice, licorice extract powder, licorice flavonoids, isomerized sugar, fermented soy milk filtrate, coral grass extract, concentrated glycerin, 1,3-butylene glycol, trehalose, 1,2-pentanediol, N-acetyl-L-hydroxyproline, L-hydroxyproline, polyglutamic acid salt, sodium chondroitin sulfate, phytosterol, hydroxystearyl phytosphingosine, N-stearoyldihydroxybenzoate Drosphingosine, N-Stearoyl Phytosphingosine, Stearoyloxyheptacosanoyl Phytosphingosine, L-Ascorbyl Magnesium Phosphate, Cholesterol, Palmitic Acid, Lauryl Dimethylaminoacetate Betaine, Glycerin, Carboxyvinyl Polymer, Acrylic Acid/Alkyl Methacrylate Copolymer, Cetyl 2-Ethylhexanoate, Glyceryl Tri-2-Ethylhexanoate, Methylpolysiloxane, Decaglyceryl Monomyristate, Lipophilic Glyceryl Monostearate, Behenyl Alcohol natural vitamin E, cetyl palmitate, bisethoxydiglycol cyclohexanedicarboxylate, anhydrous silicic acid, sodium alginate, chitosan, lactic acid, squalane, silylated anhydrous silicic acid, low-strength agar powder, xanthan gum, hydrogenated soybean phospholipid, citric acid, sodium citrate, sodium hydroxide, sodium metabisulfite, pentasodium diethylenetriaminepentaacetate solution, N-acetyl-L-cysteine, sugar squalane, absolute ethanol, ethanol, phenoxyethanol, fragrance *Active ingredients
How to use
Take an appropriate amount (2 pumps) in your hand, take the serum with your fingers, spread it on both cheeks, and gently blend it into your forehead and chin, from the center of your face outwards.
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.
Perfect One has a strong image of an all-in-one gel, but it actually also comes in a serum type. The push-type bottle is easy to use and hygienic, with six functions in one bottle (lotion, serum, emulsion, cream, pack, and makeup base). It's formulated to provide both offense and protection. The slightly thick texture makes it easy to handle, and it blends smoothly into the skin immediately after washing your face. It spreads with a light touch, and another great point is that it spreads smoothly with little friction. It's refreshing, not sticky, and has a light feel. I have combination skin, so it was comfortable to use. ◎ I want to save time on skincare! I'm starting to worry about blemishes, so I like refreshing and light items. This is a product that I would definitely recommend to anyone like that. I received it as part of an AINZ&TULPE x Perfect One gift campaign.
[Monitor/PR] Perfect One Medicated Whitening Serum (quasi-drug) 90ml Recommended for those who love laziness, time-saving moisturizing, and those who want whitening care and don't like sticky skin. It's all-in-one. Just wash your face and apply. Easy skincare. #WinningAnnouncement #SkincareInstagram→ @ainztulpe.official @perfectone_info ーーーーーーーーーーーーーーーーーー◇The only medicated all-in-one serum in Japan (for now) that combines three active ingredients for penetration support. In addition to the active whitening ingredient arbutin, a vitamin C derivative inhibits melanin production. Targets the source of blemishes. Additionally, dipotassium glycyrrhizinate prevents roughness and promotes healthy skin. The convenient push-type bottle makes it extremely easy to use. ◇Additive-free → Synthetic fragrances / Synthetic colorings / Parabens◇Active ingredients → Arbutin / L-ascorbic acid 2-glucoside / Dipotassium glycyrrhizinate (quasi-drug) Suppresses melanin production and prevents dark spots and freckles. Moisturizes skin. ◇The single item costs about 4,950 yen. It seems a little pricey, but considering the longevity and the hassle of not needing other skincare products, it's not bad! ◇6-in-1 bottle: Lotion / Emulsion / Cream / Serum / Mask / (Makeup base)◇I've been a big fan of the existing cream-type serum version, but I never knew there was a push-type version in the bottle. ◇Refreshing and soft texture. ◇Nano-sized active ingredients penetrate deep into the skin.
I use it every day! It's easy to use because it doesn't sting or dry my skin after use. I have some skin problems, but it's gentle and easy to use. I didn't notice any difference after just one use, so I'm giving it 4 stars.
As a serum, it is very easy to use and goes in smoothly, and although I'm not sure about the whitening effect yet, I feel like I want to keep using it, so I'll definitely buy it again!
I decided to try the 30ml with a first-time 50% off coupon on the official Rakuten website. Is it fragrance-free? It's fragrance-free and very easy to use!! The all-in-one products I was considering included Credo's Synactif and Benefie Crux, and Sekkisei (the new one). My number one priority was whitening. Synactif's price was a bit of a problem, and it felt too moisturizing and overly nourishing. (I used a sample.) I tried the Benefie Crux Moisturizer II sample, but I couldn't decide because it had an alcoholic taste. My current toner is Kanebo Black F. It combines both toner and emulsion functions, so one bottle is enough, but it contains no whitening ingredients. I also have two THREE toners. The scent is soothing, so I'd like to repurchase this one. I've also recently repurchased N Organic's White Clear Lotion. Since the scent alone isn't enough to achieve whitening, I'm having a hard time deciding which one to use and how. I've used Lancôme's Libby whitening serum several times, but this year I'm using Astalift's Brightening Serum. I don't like the scent of Astalift, so I tend to stop using it once I've finished it. However, I was so impressed with Perfect One's serum that I felt like I might buy it again if it was good.