ISDIN Si-Nails - Fast Absorbing Nail Strengthening and Hardening Serum for Nail Durability in Thin Nails, made with Cationic Hyaluronic Acid 0.08 FL OZ
Condition: New
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Non-returnable. Transportation of this item is subject to hazardous materials regulation
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Availability:
In Stock.
Arrives
Saturday, Nov 8
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Brand: ISDIN
Item Form: Gel
Liquid Volume: 2.5 Milliliters
Specialty: Strengthener
Number of Items: 1
Is Discontinued By Manufacturer : No
Product Dimensions : 1.61 x 1.14 x 5.67 inches; 0.32 ounces
Best Sellers Rank: #18,218 in Beauty & Personal Care (See Top 100 in Beauty & Personal Care) #32 in Nail Strengtheners
#32 in Nail Strengtheners:
Customer Reviews: 4.0 4.0 out of 5 stars 2,291 ratings
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, Nov 8
This item is non-returnable:
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
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Top Amazon Reviews
This stuff was literally an answer to prayer! HIGHLY RECOMMEND! I had been struggling with thin, peeling nails for over a year. I had back-to-back surgeries and my dermatologist told me my damaged nails were probably a result of the anesthesia. (I've never done regular manicures and very rarely polish or gel, so I couldn't blame that.) My nails were so thin they hurt and they would continually split and peel no matter how much I used nail strengthening treatments or polishes. I was at my wits end and tried ordering ISDIN as a last resort. I thought it was a little expensive at the time, but now I believe it was worth every penny! I keep an extra tube on hand now so I never run out. The product and brush are so easy to use. In the beginning I applied it twice a day but tried to keep using it at least once a day for two months. Now that my nails have improved I use it about every 1-2 days. The product is easy to apply and dries and disappears very quickly. I was worried it would be messy and sticky but it is not at all. Sometimes it takes one click per nail to get it going, but sometimes one click will treat a few fingers. A little goes a long way and you will get the feel of it. The product does take time to work. It was 2 months before I had a complete nail grow out without peeling. They are strong now but I am still careful to not use my nails as "tools" so that I don't break them. I still have a split on my thumbnail but I believe it will grow out as long as I am careful and keep applying the product every few days. I will say my nails are a little "ridged" and I don't know if that's just my nails or a result of the product, but it is a small price to pay for strong nails and I can just buff them down smooth. The photos you see are: 1. at the beginning of use, 2. after 6 weeks of using the product, and 3. at 2 1/2 months (they do grow longer but I like to keep them short) Don't hesitate! Buy this product!
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Reviewed in the United States on June 4, 2024 by Letty Graff Letty Graff
I've been using Isdin for about two years (my guess--maybe more). I have purchased at least four of them over that time. I'm very old and my nails were splitting terribly--about five of them were very bad. I used super glue to hold them together. I found you have to be very religious about painting the solution on every morning and if you can every evening. Of course, I wasn't that religious, but what it seemed to do is flatten the ridges in my nails and that kept my nails from splitting at the ends. I still have one nail that still has some super glue on it, but I'm hoping for that to start behaving soon. Nothing else ever worked.
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Reviewed in the United States on October 21, 2025 by Agnes Aqualaris
I wish I knew if this product worked or not - but there was no liquid in the pen to apply? The instructions say to click 25 times to moisten the brush. I clicked 200 times and nothing.... It sounds like others are having this same issue. This also was not a returnable item - but I receive a refund. Waste of time
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Reviewed in the United States on October 11, 2025 by L.J.
I have tried dozens of products like this for my nails over the years. This is the first that works -- and it works amazingly well, even on my weak, brittle nails. It began strengthening my nails in ways that were obvious within the first couple of days. My nails were longer and stronger well before the first week was up. Although it strikes me as expensive, I plan to keep using it, because it actually works!
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Reviewed in the United States on May 25, 2025 by Lily025
This product has made such a big difference in my nails. My doctor sent me to a dermatologist who told me there wasn’t anything they could do for me since prior treatments were not effective. My nails had major ridges, the nail had separated from a portion of the nail bed, they would break or tear easily, and were thin. I started using this product on May 9, 2025, and I used it as recommended faithfully, and within weeks I was noticing such great improvement in my nails. They are stronger, have less ridges, and the nail is no longer separated from the nail bed. I thought it was ridiculous that I had to pay the $50 copay to the dermatologist only for him to look at my nails and discuss the situation for like 5-10 minutes. But since he recommended I try this product, and it has been successful in repairing my nails, I suppose the $50 copay was worth it in the end. 😆 I highly recommend this product if you suffer from similar symptoms. I’m including two “before” pictures, and one “after” picture. Great product!! The only reason I did not give 5 stars is due to the price, which I feel is a tad high. I was lucky to find it on sale, so I snagged two pens at the sale price.
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Reviewed in the United States on August 13, 2025 by Suzannebsn68 Suzannebsn68
I have waited four months to write this review because it just seemed too good to be true. But it is true. I am a senior citizen who suddenly found all my nails chipping, cracking, and splitting. I thought about posting a "before" picture, but they looked too awful. I used to try to hide my hands when in public. I tried nine months of biotin capsules, and no results. I found a recommendation from other users online of the ISDN product. When I started using it, I was completely skeptical. The product is clear, thin, and more like water than anything else. I could not see how this could work. It took six to eight weeks before I began to see genuine results - tiny 1/8" nails taking the place of nails that looked like they had been chewed off by rats. Now, five months on, I have 1/4" normal-looking nails that make me happy every day. I have to file them to keep from getting too long, but not in order to even out breakage. They don't seem to chip or break at all under normal use. I actually took the ISDIN box to show my doctor. She said they often have people ask for help with breaking nails, and they never have anything to suggest. She took down the info about this product. For me, a container lasts about two months or longer. I have noticed that the applicator doesn't always work the way the instructions say. Often I get enough product from one "click" to do a whole hand. Other times, the applicator needs to be primed several times. But I don't care as long as it works SO well. Reading over my review, it looks like someone paid me to write it! It's all true.
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Reviewed in the United States on May 11, 2025 by Amazon Customer