ISDIN Si‑Nails Nail Strengthening & Hardening Serum, 0.08 fl oz — strengthens brittle nails, hydrates cuticles

ISDIN Si-Nails is a concentrated nail serum designed to strengthen, harden and hydrate brittle nails for visibly healthier-looking results with consistent use.

Formulated in Spain, this compact 0.08 fl oz treatment combines silicon-promoting and keratin-supporting ingredients with enhanced hyaluronic acid to improve nail resilience and cuticle hydration. The lightweight, fast-absorbing formula is intended for daily application on weakened or rough nails to help restore their appearance over several weeks.

How does ISDIN Si-Nails make nails feel stronger?

The serum contains silanediol salicylate, an ingredient that supports silicon levels in the nail plate, plus pistacia lentiscus gum which encourages keratin structure. Together they work to increase nail firmness and reduce the sensation of softness or bending.

• Silicon support helps reinforce nail architecture
• Pistacia lentiscus gum promotes keratin integration
• Regular use improves resistance to splitting and bending

Will this treatment help dry cuticles and surface roughness?

Yes — the formula includes cationic hyaluronic acid, an advanced moisturizer that binds water at the nail edge to reduce dryness and rough texture. It nourishes the surrounding cuticle area without leaving a sticky residue, making nails look smoother and better defined.

• Cationic hyaluronic acid boosts cuticle hydration
• Reduces visible roughness on the nail surface
• Absorbs quickly for a non-greasy finish

How soon can you expect visible improvements?

Individual results vary, but consumer feedback indicates noticeable changes in nail hardness, hydration and brittleness after consistent daily application for several weeks. The small 0.08 fl oz size is concentrated, so a little serum per nail is effective over time.

• Daily application recommended for best outcome
• Visible improvements reported around the 4-week mark
• Small bottle delivers multiple applications due to concentrated formula

How should I use this serum within my nail routine?

Apply a thin layer directly to clean, dry nails and surrounding cuticles once daily or as directed. Allow the product to absorb before applying polish or other treatments; it pairs well with regular nail trimming and gentle filing to support healthy regrowth.

• Use on bare nails for optimal absorption
• Allow full drying time before polish or hand creams
• Combine with gentle nail care (filing/trimming) for best results

Who is this for: ISDIN Si-Nails Strengthening & Hardening Nail Serum is suited to anyone noticing weak, brittle or rough nails who wants a targeted, cosmetic treatment to improve nail appearance and hydration. It can be used by those seeking to rebuild nail resilience after mechanical damage or seasonal dryness, and by people who prefer a scientifically formulated, non-greasy daily serum developed in Spain.

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