- Si-Nails Strengthening & Hardening Nail Serum Treatment, 0.08 fl oz

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!

I wish I had thought to take "before" pics for this review. For years, my nails have been an embarrassment. The nails were brittle and would just rip apart if they grew past my nail bed. The top layer would peal back. If I was out with a group of people I would try to keep my fingers hidden. Sometimes, I notice women looking at them. Ugh, what an embarrassment. I finally went to a dermatologist who ran some tests. Results... my body is no longer storing "zinc", which promotes strong nails and hair growth. She immediately recommended this product. After using one pen, you can see in the pics that my nails look pretty healthy and are growing again. I'm so relieved that I just needed to write this review. If you are experiencing these types of issues with your nails, see your doctor, but also, give this product a try!

Very disappointing in terms of the amount of product in the pen. Actually a bit of a rip off given the price of the product. I have used a similar product with supposedly the same amount of product in the pen and it has lasted me more the twice the mount of time. Another issue ... you cannot see what is in the pen. So, imagine my surprise when I could no longer "click" the pen and pressing the top did not do anything at all. Pen was dried up. Does not matter if it works as it won't last long enough to make that determination. I frequently spend large amounts of money for top of the line cosmetics ... if they deliver what they promise ... I am fortunate enough to be able to buy more. This is not a product I will repurchase nor will I recommend it to anyone. I don't mind spending money ... but I really dislike being cheated.

Life changing (at least for my nails LOL). I never leave reviews but this is too good not to share. Disclaimer: I'm a nail nut. A few years ago, at the age of 53, I decided I was very tired of brittle, flaky, dry, weak nails. I have always taken care of my nails, so the changes I was seeing were age related. I was eating healthy and exercising, was using nail polish but never gel, I moisturized etc. Nothing was helping. I used a special nail oil 6-8 times a day and no acetone and no nail polish for A YEAR and saw very little improvement. Then I discovered Dr Dana's Deep Hydrading Formula and saw an immediate improvement using their Deep Hydrating Formula...again I applied it on average 6 times a day so definitely was committed. My nails stayed short but stopped splitting and chipping...that was after about a month of use. They also have a hyaluronic serum but recommend using once a week. Then I discovered this product and went nuts with it. I bought three applicators, kept one by my desk, one in my bathroom and one in my car. I probably apply it 12 times a day LOL...certainly after any time I was my hands. It's easy. I apply a top 'coat' of the Dr Dana Formula after using the SI-NAILS. This is the magical combo. My nails are strong, flexible, and growing. This is the best they've looked in 20 years. So if you are unhinged like me and willing to go the distance, the combo of these two products changed my nails, they look 30 years younger ;)

I’m having to update my review because despite only getting to use it twice because the product packaging is super faulty, it works! I have been struggling to repair my nails for YEARS, and they are strong and grown out again instead of delaminating. Also, a split I haven’t been able to grow past in 4 years on my thumb nail is healed. It’s stupid expensive if you only get two uses out of it like I did, but I’d buy it again if my nails start showing the same issues because it is the only thing to have worked! The button to click gets stuck constantly, so trying to use this is basically a workout for your thumbs. For such a high price, I’d expect it to function better. I’ve only been able to successfully use it twice, with a ton of effort and time to get the button to click correctly. Can’t say if it works on nails, because I can’t get it to function well enough to use it.

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.

I've only been using this product for approx a month and my nails aren't any better. A friend gave me this product and it ran out so I bought another one hoping it would work.

This nail strengthener is so good! It is a bit expensive, but totally worth it for me. I’ve never had strong nails before, and this has made a huge difference.

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Llegó a tiempo y bien empaquetada. Es de uso muy práctico. Apenas la estoy usando pero en la uña comienza a notarse un cambio. Sin embargo falta tiempo de uso para especificar si en verdad funciona o no.

Espectacular producto

Me gusta este producto, ayuda mucho al crecimiento de las uñas, en mi caso si ayuda a que crezcan pero se me siguen rompiendo :(

Lamentablemente me queme las uñas debido a una reacción alérgica al gelish 😢 lo adquirí para empezar a cuidar mis uñas naturales de nuevo y es una verdadera joya, están creciendo bastante, súper fuertes y sanas y sin romperse ninguna 🤩 recomiendo totalmente