OSAJI
Osaji KAI Revelation Serum, 30ml
Osaji KAI Revelation Serum, 30ml
@cosme rating: 5.0/7.0
A melting serum that leads to bouncy, firm, and radiant skin
✓ 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
A melting beauty essence that gives your skin a moisturized, bouncy, firm and radiant skin. This is an anti-aging beauty essence that focuses on the synthesis of intercellular lipids that weaken with age while supporting the stratum corneum's "self-moisturizing function". It contains "Alpine Rose Extract. Rhododendron Ferrugineum Extract. " and "VC Glycerin. Bisglyceryl Ascorbic Acid. " that contain two types of polyphenols, focusing on oxidation and glycation that can cause dullness and stiffness of the skin. In addition, phytosterol, which is related to skin moisture, is made into a capsule-like. liposome structure. with multiple layers that are excellent for carrying beauty ingredients, so that it is properly delivered to the stratum corneum. It also contains white fungus polysaccharides with high moisturizing power and inositol that prevents rough skin. This is an anti-aging beauty essence that you can use comfortably and supports the basic strength of your skin. *Skin care according to age
Ingredients
Water, Propanediol, Glycerin, Pentylene Glycol, Inositol, Tremella Fuciformis Polysaccharide, Hydrogenated Lecithin, Phytosterols, Bisglyceryl Ascorbate, Rhododendron Ferrugineum Extract, Jojoba Seed Oil, Caprylic/Capric Triglyceride, Polyacrylate Crosspolymer-11, t-Butanol, Hexyl Dimethylolpropionate, Rosa Damascena Flower Oil, Jasmine Oil
How to use
After toning your face with a facial toner, gently apply an appropriate amount (1-2 pumps) from the center outwards. *We recommend applying additional layers to areas prone to dryness. <Basic Steps> KAI Revelation Toner (lotion) → KAI Revelation Serum (serum) → KAI Revelation Moisturizer (cream) → KAI Revelation Eye Cream
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.
This serum has a floral fragrance that spreads throughout, making you feel incredibly luxurious. I received a sample when I bought OSAJI perfume and was enchanted by how well it penetrated and smelled. I'd used up all my other serums, so I finally bought this one! It has a natural, gorgeous scent that makes you want to take a deep breath. It's not a lingering scent, so I use it morning and night without worrying. It's thick, but I like how it penetrates quickly. Depending on the combination, it may not be quite moisturizing enough. I was just about to run out of my Toubert emulsion, so I switched to Curel's Freckle Prevention Care Emulsion and am seeing how it goes. If your other cosmetics are moisturizing, I don't think it'll be a problem. (I tend to prefer products that are light and absorb easily, so I generally use lighter products.)
Osaji's gentle serum. It has a lovely, gentle scent and gentle moisture, making it a great serum. The frosted glass container is also delicate and cute. However, although it was good, I'm not sure if I'd buy it again. I might come back to it after trying out a few other serums.
I used a sample. The scent is natural and seems fine. I don't think I'll know the effect until I use it regularly, but I'm not that interested in it, so I don't think I'll buy it.
I was concerned about the yellowing of the skin around my mouth, and I assumed it was due to glycation, so I bought this serum, which I heard contained anti-glycation ingredients, to see if it could help. It was my first time buying a serum at this price point, so I was excited. It's only been about two weeks since I started using it, and while I haven't seen any dramatic changes, I do feel like my skin is clearer. Ultimately, after careful consideration, I've concluded that the dullness I'm concerned about is most likely due to dryness, and I'm not sure how effective the anti-glycation ingredients will be on my skin. Currently, I'm using it more as a preventative measure than for improvement, so I was hoping to continue using it, but the KAI series is being discontinued. Anti-glycation cosmetics are rare, so I hope they continue to release serums. The subtle scent is pleasant, not too sweet, and easy to use.
I received a sample when I went shopping. I used it in the following order: primer → lotion → serum → emulsion. Because it's gel-like, it absorbs smoothly into the skin. It's not sticky and doesn't interfere with makeup. It was very easy to use, but it didn't really work for me... I prioritize immediate results, so I don't think I'll be buying the full product.