REIKO KAZKI
REIKO KAZKI Eyelash Serum
REIKO KAZKI Eyelash Serum
@cosme rating: 4.7/7.0
Focusing on lack of firmness and elasticity! For adult eyelash care.
✓ 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
For eyelashes that tend to become thinner and shorter with age. This eyelash serum focuses on the loss of firmness and elasticity, providing aging eyelash care. Formulated with human stem cell conditioned medium*1, placenta extract, and panthenol, it helps to strengthen eyelashes that tend to weaken with age, leading to firm, resilient, and healthy lashes. In addition, it contains four beauty ingredients including vitamin H (biotin)*2, Suizenji Nori polysaccharide, peony root extract, and olive leaf extract. These moisturize and smooth the eyelashes. Two fermented extracts, Saccharomyces/Soybean Protein Ferment and Saccharomyces/(Stevia Leaf/Stem) Ferment Extract, moisturize the skin around the eyes. It supports the overall impression of the eye area, not just the eyelashes. Designed with the delicate eye area in mind, it is less likely to cause pigmentation and is fragrance-free and colorant-free. It is easy to use even around the eyelids and can be used comfortably every day, even on sensitive eyes. This product can be used even by those with eyelash extensions. The tip applicator makes it easy to apply to the base and edges of the eyelashes, making it ideal for beginners. Use twice a day, morning and evening, as part of your skincare routine. The eyelash growth cycle is approximately 1-3 months. Why not start with a 3-month daily care routine? *1 Ingredients: Human stem cell conditioned medium [Purpose of inclusion: Moisturizing ingredient] *2 Ingredients: Biotin [Purpose of inclusion: Moisturizing ingredient] Regarding the use of eyelash serum products, the National Consumer Affairs Center of Japan issued a warning on August 8, 2019. Please read the usage instructions carefully before use to ensure safe and appropriate use. How to use: After washing your face and applying skincare products, use on clean skin. Gently apply the serum to the base of your eyelashes using the tip of the fine brush. Apply slowly once, focusing on the base of the upper eyelashes, from the inner corner to the outer corner of the eye. You can apply to the lower eyelashes in the same way. We recommend using it twice a day, morning and evening.
Ingredients
Water, BG, Pentylene Glycol, Placenta Extract, Human Adipose-Derived Stem Cell Conditioned Medium, Panthenol, Biotin, Suizenji Nori Polysaccharide, Peony Root Extract, Sphingomyelin, Olive Leaf Extract, Saccharomyces/Soybean Protein Ferment, Saccharomyces/(Stevia Leaf/Stem) Ferment Extract, Glycerin, Xanthan Gum, Citric Acid, Sodium Citrate, EDTA-3Na, Phenoxyethanol, Methylparaben
How to use
After cleansing and applying skincare products, use on clean skin. Gently apply the serum to the base of your eyelashes using the tip of the fine brush. Apply slowly once, focusing on the base of the upper eyelashes, from the inner corner to the outer corner of the eye. You can apply to the lower eyelashes in the same way. We recommend using it twice a day, morning and night.
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.