ISDIN Si-Nails Serum Nail Strengthener

ISDIN Si-Nails Fast Absorbing & Hydrating Nail Serum Strengthener

(formerly known as ISDIN Si-Nails Serum Nail Strengthener)

0.08 fl oz

4 View 46 reviews

| HSA|FSA Eligible LMN Required

$39.00

Special Offer: 30% off use code BFS25

View Details

Highlights

Promotes nail strength
Infuses nails with essential nutrients

In stock & ready to ship!

Buy Now, Pay Later or

Free, fast shipping all U.S. orders, no minimums. 2-3 day delivery, most orders

Learn More

Authorized Retailer

Never receive a fake product

Learn More

Product Overview

ISDIN Si-Nails Fast Absorbing & Hydrating Nail Serum Strengthener supports the strength of thin, brittle nails.

This innovative nail strengthener helps promote nail growth and has been clinically proven to strengthen brittle nails by increasing thickness, density, and durability of the nail and cuticle. Providing visible results in just 14 days, this nail treatment also uses cationic hyaluronic acid to provide cuticle moisturization.

Key Features:

Silanediol salicylate promotes silicon, which is an essential mineral in the nail
Pistacia lentiscus gum promotes keratin, an essential component of strong, healthy nails
Repairs brittle nails and reduces roughness

Highlights

Promotes nail strength
Infuses nails with essential nutrients
Hydrates cuticles

Ingredients

Directions

Shipping & Returns

Free U.S. Shipping. Period. View Our Shipping Policy

Return Policy: View Our Return Policy

Availability: In stock & ready to ship! . Ships within the U.S. only.

Questions & Answers

Submit your question about this product to our talented team of Customer Care Representatives, and we'll get back to you as soon as possible!

Ask a New Question

Product Specifications

Special Offers

30% off use code BFS25 Learn More

Featured In

Customer Reviews (46)

Overall Rating

Based on 46 reviews

Review Summary

5 Stars

4 Stars

3 Stars

2 Stars

1 Star

Write a Review

You can receive 50 rewards points by sharing your honest opinion of ISDIN Si-Nails Fast Absorbing & Hydrating Nail Serum Strengthener.

Write a Review

Sort By

Read all reviews

46 Reviews

LovelySkin Customer

from Tennessee

Age Group: 70-79

Verified Purchase

November 20, 2025

Works to Strengthen my Nails

I have nails that delaminate, and I have tried many products that are marketed to address this problem. Most of them are sold as some type of "nail strengthener" and unfortunately, they do nothing to address my problem. I am pleased to say that this product has provided me some success in growing out my nails. It takes awhile to grow them out but when I am diligent about applying the product daily, it does strengthen them. It also seems to secure the delamination. I have been using it for about three weeks now and during this time, they are significantly improved. I believe my condition is age-related so I don't expect to eliminate the problem entirely, but at least my nails look much better and they are growing out nicely. I am pleased with the progress thus far. Incidentally, I came upon this product after reading a medical journal article about an ingredient that has shown to be effective in addressing nail delamination, and I learned this product contains that ingredient so the results are evidence-based in a scientific research study.

1 person found this helpful

LovelySkin Customer

from California

Age Group: 50-59

Curly hair, Damage & split ends

Mature Skin

Verified Purchase

September 03, 2025

Repeat Purchase-It's a Hit

After over a year of consistently getting gel nails, my natural nails were left weak, thin, and full of ridges. It takes longer then the stated 14 days however, after using it daily, within a couple of weeks, I noticed my nails growing faster than they had in months. Not only that, but they started feeling and looking stronger. Over time, even the ridges have improved. If you’re trying to recover from gel damage or just want to boost nail health in general, I 100% recommend this serum.

1 person found this helpful

LovelySkin Customer

from Georgia

Age Group: 70-79

Wavy Hair

Combination Skin

Verified Purchase

July 19, 2025

Stops nails from splitting

ISDIN SI-NAILS is the only product I’ve tried that stops my nails from splitting and flaking. I use it several times a week and it works very well. I keep my nails short and I don’t paint them because if I do anything to them, they’ve split and flake.

0 people found this helpful

Allisonw

Verified Purchase

June 12, 2025

Strong nails at last!

I’ve been using this product for about six months. I’ve noticed a huge difference in the strength of my nails it dries quickly and absorbs quickly.

0 people found this helpful

DDG0702

Verified Purchase

June 10, 2025

No difference

Used as recommended, didn’t notice any difference.

0 people found this helpful

Sheshell

Verified Purchase

May 26, 2025

Brush system poor

This product is expensive and the delivery system doesn’t dispense much product. I got less than a month use out of it. Hard to initiate serum to dispense

1 person found this helpful

LovelySkin Customer

Verified Purchase

April 16, 2025

I've tried everything from nail hardeners to Biotin and this is the only nail treatment that has shown quick and long lasting results. Downside is a pen only last for about a month if you use it daily.

0 people found this helpful

Roberto

Verified Purchase

June 06, 2024

Nails are getting better

I have been using Isdin's nail hardening product for about 10 months and results are beginning to show

0 people found this helpful

Read All 46 Reviews +

Load More Reviews +

Your cart is empty

ISDIN Si-Nails Fast Absorbing & Hydrating Nail Serum Strengthener

Product Overview

ISDIN Si-Nails Fast Absorbing & Hydrating Nail Serum Strengthener supports the strength of thin, brittle nails.

Highlights

Ingredients

Directions

Shipping & Returns

Questions & Answers

Product Specifications

Special Offers

Featured In

Customer Reviews (46)

Overall Rating

Review Summary

Write a Review

Works to Strengthen my Nails

Repeat Purchase-It's a Hit

Stops nails from splitting

Strong nails at last!

No difference

Brush system poor

Only lasts two weeks

Nail recovery

Extremely Little Quantity / Not Worth It

Great Nail Strengthener

Good but can lose some product

Still new user - I like it

I don't see a differernce

Great stuff

Noticeable Strength

Best treatment for nails

Fantastic Nails!

Tube defective

This Works!

Nails are getting better

Top Picks