BARTH
BARTH Neutral Bicarbonate Face Mask, 1 sheet
BARTH Neutral Bicarbonate Face Mask, 1 sheet
Rated 4.0 out of 7.0 by Japan’s largest beauty community
Instantly make a neutral bicarbonate mask
✓ 100% AUTHENTIC, SHIPS FROM JAPAN
✓ DUTIES & TAXES INCLUDED FOR US ORDERS
Couldn't load pickup availability
What it is
This face mask is made with a serum rich in bicarbonate ions, created by the neutral bicarbonate bath additive brand "BARTH." It features a separate formulation that requires mixing just before use. The BARTH powder dissolves in the serum in the bag, generating bicarbonate ions. The serum, containing fresh bicarbonate ions, tightens and refines skin texture. [Key Features] Firms and radiates with a serum rich in bicarbonate ions. The serum's neutral pH generates bicarbonate ions. The bicarbonate ions are fully dissolved in the serum, eliminating any crackling sensation. The serum, rich in bicarbonate ions and containing organic moisturizing ingredients (lavender flower extract, sage leaf extract, and rosehip fruit extract), penetrates deep into the stratum corneum, leaving skin firm and radiant. Free of nine synthetic fragrances, alcohol, glycerin, mineral oil, parabens, silicone, synthetic colorants, UV absorbers, and animal-derived ingredients. The face mask is made with 100% pure cotton sheets.
Ingredients
[Serum] Water, BG, Pentylene Glycol, Lavender Flower Extract, Sage Leaf Extract, Rosa Canina Fruit Extract, Glucosyl Trehalose, Hydrolyzed Starch, Xanthan Gum, Sodium Citrate, Phenoxyethanol [BARTH Powder] Sodium Bicarbonate, Sodium Carbonate, Citric Acid, PEG-150, Sodium Ascorbate, Sodium Caprylyl Sulfonate [Face Mask (Sheet)] 100% Cotton
How to use
It takes about 3 minutes for bicarbonate ions to be generated. It is recommended to prepare it before washing your face. Fold the bag in half and press firmly on the serum side to transfer the serum to the BARTH powder and face mask side. Once the serum has flowed into the face mask, gently shake the bag and leave it for about 3 minutes. Once the serum and powder have mixed, bicarbonate is generated and the bag has expanded slightly, gently massage it to thoroughly absorb the serum into the face mask. Place the face mask on your skin after washing your face. Leave it for 5-10 minutes, then remove the mask and gently massage any remaining serum into your skin with your palms. After use, proceed with your usual skincare routine.
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.