TSUDA COSMETICS
Tsuda Cosmetics 5C Barrier Serum, 45ml
Tsuda Cosmetics 5C Barrier Serum, 45ml
@cosme rating: 5.3/7.0
A beauty serum containing five highly penetrating* vitamin C derivatives. *Deep into the stratum corneum
✓ 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 serum contains five types of vitamin C derivatives, including an ultra-high penetration vitamin C derivative*1. It contains five vitamin C derivatives and five barrier-boosting ingredients in a unique balance. It penetrates deeply*2 to leave skin with a smooth, bright texture. It protects skin from oxidized sebum and external stimuli, leading to skin that is less susceptible to external stress. *1 Isostearyl ascorbate 2Na (moisturizing ingredient)*2 penetrates deep into the stratum corneum.
Ingredients
Water, BG, ethanol, DPG, PEG-32, squalane, glycerin, disodium isostearyl ascorbyl phosphate, ascorbyl tetrahexyldecanoate, 3-glyceryl ascorbic acid, 3-laurylglyceryl ascorbic acid, ascorbyl propyl hyaluronate, trehalose, fullerene, soybean sprout extract, akebia japonica extract, inositol, theanine, water-soluble collagen, chamomile flower extract, camphor, retinol palmitate, hydrolyzed collagen, coptis japonica root extract, sodium hyaluronate, ceramide NG, dimethicone, phytosteryl macadamiate, hydrogenated lecithin, cholesteryl hydroxystearate (wool), orange oil, carbomer, cholesterol, potassium hydroxide, tocopherol, corn oil, glycine, phytic acid, silver oxide, phytosterols, sclerotium gum, citric acid, sodium citrate, sodium bicarbonate, phenoxyethanol, platinum
How to use
After washing your face, gently apply to skin that has been conditioned with booster conditioner and lotion.
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'm buying this again. It's one of the best Vitamin C products that doesn't irritate my skin and is easy to use.
It's effective not only for whitening but also for firming and reducing dullness. It can be used safely on sensitive skin and around the eyes. It doesn't have an immediate effect, but you'll appreciate the benefits over time. It's expensive, so there are probably better products out there, but if you have sensitive skin, this is a great product to have. I apply two pumps after my lotion, and it leaves my skin feeling moisturized but quickly becomes dry.
It's the best, it doesn't sting or stickiness.
I started using TSUDA cosmetics when my skin got rough and I found it very effective. Whenever I experience dryness, sensitivity, or other problems, I use the entire TSUDA cosmetics skincare line. This product is on the more expensive side of the line, so I hadn't yet gotten it, but I wanted to tackle dark spots, so I bought it. I have naturally sensitive skin, but it doesn't irritate or sting. When I use this, my skin looks smooth. I plan to continue using this as my morning serum.