ISDIN Si-Nails nail-strengthening serum 0.08 fl oz — fast-absorbing, hydrating treatment for brittle nails

Formulated in Spain, this concentrated 0.08 fl oz treatment blends silanediol salicylate, pistacia lentiscus gum and cationic hyaluronic acid to support nail structure, encourage keratin-related resilience and moisturize cuticles. The lightweight, quick-dry formula is applied like a polish and integrates into a daily grooming routine without leaving a sticky finish. Clinical testing and user feedback show improved hardness and reduced roughness after consistent use.

How does ISDIN Si-Nails make nails stronger?

Si-Nails supplies building-block support and targeted moisture to the nail plate. Silanediol salicylate helps provide silicon-related benefits for nail composition while pistacia lentiscus gum supports keratin, the protein that gives nails structure.

• Silicon-promoting silanediol salicylate for nail mineral support
• Pistacia lentiscus gum to encourage keratin presence
• Light, non-greasy serum that absorbs into nail layers

Will this improve dry or peeling cuticles and rough nail surfaces?

Yes — the cationic hyaluronic acid in the formula delivers hydration where it’s needed and helps lock moisture into the cuticle and nail edge. Increased surface hydration reduces roughness and helps prevent further splitting when used consistently.

• Cationic hyaluronic acid for enhanced cuticle moisturization
• Reduces visible roughness with repeated application
• Non-sticky finish that layers under nail polish

How should I use Si-Nails for best results?

Apply the serum daily to clean, dry nails using the brush applicator, similar to a clear polish. Consistent, short-term use (several weeks) is recommended to see improvements in hardness and reduce brittleness as nails grow and repair.

• Use once daily on bare or freshly cleaned nails
• Allow to dry before handling items or applying polish
• Continue routine for multiple weeks for measurable improvement

Is this product suitable for everyday grooming or salon use?

ISDIN Si-Nails is formulated for both personal and professional grooming as a lightweight, fast-absorbing serum. Its subtle finish and small bottle size make it convenient for at-home treatment and as a supplemental step during salon manicures.

• Small 0.08 fl oz bottle fits travel and salon kits
• Works under polish or as a stand-alone treatment
• Designed for routine, repeat application without residue

Who is this for: ISDIN Si-Nails suits people with thin, brittle or rough nails who want a targeted, cosmetic-strengthening treatment that boosts hydration and structural support without heavy oils or long drying times. It’s also appropriate for those seeking a compact, daily-use serum developed with silicon-promoting and keratin-supporting ingredients.

Ingredients

Water, Alcohol Denat., PEG-40 Hydrogenated Castor Oil, Butylene Glycol, Acrylates Copolymer, Silanediol Salicylate, Tromethamine, Caprylic,Capric Triglyceride, Hydroxypropyltrimonium Hyaluronate, Triethanolamine, Biosaccharide Gum-2, Pistacia Lentiscus (Mastic) Gum, Propylene Glycol, Phenoxyethanol, Benzyl Alcohol, Methylparaben