Dr. K
Doctor K C Concentrate Oil Serum, 20ml
Doctor K C Concentrate Oil Serum, 20ml
A rich vitamin C oil serum that fights the "skin roughness spiral" of a stressful society.
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• Authenticity guaranteed.
• Ships direct from Japan in 3-5 days
• Custom duties & tariffs fully handled by us for US customers.
• Track your order via USPS, Royal Mail, Canada Post, Australia Post.
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What it is
Contains vitamins A, B, C, and E plus caffeine and glutathione, key ingredients in the skin-beautifying mechanism. Addresses pores, dullness, shine, and irregular texture in skin whose barrier function has been weakened by external stressors such as pollen and dryness, preventing rough skin. High-purity botanical oils blend in smoothly, giving you fresh, clear, firm skin with no visible pores. Fragrance Natural essential oils that fill your skin and mind with positivity: rosehip, lavender, geranium, rosemary
Ingredients
Squalane, Ethylhexyl Palmitate, Jojoba Seed Oil, Haematococcus Plavialis Oil, Bilberry Leaf Extract, Artichoke Leaf Extract, Caper Fruit Extract, Chondrus Crispus Extract, Licorice Root Extract, Rosa Izayoi Extract, Geranium Robus Extract, Rosemary Leaf Extract, Rosa Canina Fruit Oil, Lavender Oil, Rosemary Leaf Oil, Pelargonium Graveolens Oil, Ascorbyl Tetraisopalmitate, Trisodium Ascorbyl Palmitate Phosphate, Magnesium Ascorbyl Phosphate, Retinol Palmitate, Thiamine HCl, Niacinamide, Calcium Pantothenate, Pyridoxine HCl, Cyanocobalamin, Riboflavin, Tocopherol, Caffeine, Glutathione, Zea Mays (Corn) Oil, Polyglyceryl-10 Oleate, Sucrose Stearate, Tricaprylin, Octyldodecyl Myristate, Butylene Glycol, Glycerin, Water, Sorbic Acid, Pentylene Glycol, Phenoxyethanol
How to use
After toning your skin with lotion or serum, take an appropriate amount (about the size of a 5-yen coin) into the palm of your clean hand and apply it to your entire face, neck, and décolleté. *It is also recommended for use on the body, including elbows and heels, as well as for dry scalp and frizzy hair ends. <Recommended amount to use> Use morning and night for approximately 1-2 months.
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All products are fresh off the shelves and never outdated.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.
If you apply too much it becomes thick, but I like to apply it lightly with a brush. It doesn't feel dry. Rather than using it as a foundation, I use it as a finishing touch.
I tried it in the store and was so impressed that I bought the actual product. I had a hard time choosing a color, but I told the salesperson that I wanted to avoid pink colors because my face gets hot easily, and she recommended sand. I don't think this product is for people who like a finish that's close to bare skin, but for people who like the feeling that "I'm wearing makeup. " I use a thick face powder puff to firmly pat it into my skin.
It has been renewed and is now easier to use. You can choose the coverage by turning the sponge on either side. Use the sponge side thoroughly when applying makeup in the morning. Use the brushed side lightly when touching up your makeup. Excellent!
I bought the sand color. It has good coverage and doesn't crumble or look messy, so I like it. I'm going to try using it for a while.
The finish is matte and hides light blemishes. What surprised me was that the makeup didn't come off much even on the area above my nose that gets rubbed by the mask! Every foundation I've used up until now has left marks from masks, but this is amazing.