D-UP
D-UP Strong Guard, 15ml
D-UP Strong Guard, 15ml
Rated 5.0 out of 7.0 by Japan's largest beauty community.
For cracked, chipped, and split nails. A nail reinforcing coat that strengthens weak nails.
✓ 100% authentic. Direct from brand or official stores only
✓ Ships from Japan in 3-5 days
✓ Duties prepaid for US orders
✓ Track your order via your national carrier (USPS / Royal Mail)
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What it is
For cracks, chips, and split nails. A nail reinforcing coat that strengthens weak nails. It coats and physically reinforces nails while covering vertical lines and unevenness. Contains 4 useful ingredients. Targets weak and damaged nails. Leads to healthy and beautiful nails. Contains keratin, diamond powder, squalane, and calcium pantothenate. Beautiful gloss finish. A fresh gloss like a top coat. Each time you apply it, it increases the shine, making your entire hand look beautiful.
Ingredients
Ethyl acetate, butyl acetate, nitrocellulose, adipic acid/neopentyl glycol/trimellitic anhydride copolymer, acetyl tributyl citrate, isopropanol, glycolic acid, water, butanol, oxybenzone-3, gluconolactone, squalane, hydrolyzed keratin (wool), calcium pantothenate, diamond powder, potassium sorbate, phenoxyethanol, purple 201, sodium benzoate
How to use
Thoroughly wipe away any moisture or oil from the nail surface, then apply evenly to your nails. Make sure it is dry, then apply another coat of this product on top. We recommend removing it with nail polish remover and reapplying once a week. Can also be used as a base coat or top coat.
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All products are fresh off the shelves and never outdated.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.
I bought this from Suzykirei shopping! My nails are weak and often crack or chip, so I had been interested in this product after reading reviews. I tried it out and loved it. When I applied it, it coated my nails and I feel like they're stronger than if I didn't use anything. I'd be happy if I continued to apply it frequently and my nails wouldn't crack.
I prefer polish because my nails are naturally thin. I bought this because it said it could also be used as a base coat. It doesn't dry particularly quickly, but the texture was stickier than I expected, so it felt like it dried quickly. It looks great with just two coats. Even with two coats, the way your nails bend when you press them changes significantly, so I expect it will be stronger. I'm still on hold about how long the color will last until I've used it for a while, but I'm considering repurchasing.
I will buy it again as it strengthens my nails.
I bought this product because I was worried about leaving my nails bare after removing the gel nail polish I'd been wearing for over three years. I applied one coat to my bare nails, left it for about three minutes, and then applied another coat. I don't really like the shiny look of top coats, so I apply Nail Holic's Matte Top Coat on top. The hyponychium that had grown so well during my gel nails disappeared the moment my nails returned to their natural state, but it has returned since I started using this product. I removed it once in the morning, intending to apply it when I got home that night, but when I put my hand in my pocket and went out, my nails went soft just by touching them with my fingertips, so I really did feel that applying this product strengthens my nails quite a bit.
It was easy to apply with a large brush. I'll test it a bit more to see how long it lasts.