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

Customers find the nail serum effective and appreciate its easy-to-use applicator pen, noting it makes nails grow fast and become long and strong. The product receives mixed feedback regarding nail strength - while some report no breakage or splitting, others mention their nails breaking more frequently. Customers disagree on the drying time, with some saying it dries quickly enough while others report it drying out their nails. The quantity and value for money receive negative reviews, with customers noting very little product in the vial and considering it not worth the cost.