Quick Comparison
| # | Product | Best For |
|---|---|---|
| 1 | OPI Nail Envy Nail Strengthener, Original | Best Overall |
| 2 | OPI Nail Envy Sensitive & Peeling | Best for Peeling Nails |
| 3 | Sally Hansen Hard as Nails Nail Hardener | Best Budget |
| 4 | Sally Hansen Hard as Nails Serum | Best Serum Treatment |
Nail strengtheners work by coating and protecting the nail, often with proteins or film-formers, so nails are less likely to bend, peel, or chip.
They don't change how fast nails grow. Consistency matters most: most treatments are applied every few days for several weeks.
OPI Nail Envy is the best-known nail strengthener, with hydrolyzed wheat protein and calcium. Wear it alone or as a base coat under polish.
The Original formula targets weak, damaged nails.
OPI's Sensitive & Peeling formula is designed specifically for nails that peel and need gentler strengthening.
A good choice after gel or acrylic removal.
Sally Hansen's Hard as Nails is the drugstore classic, a clear hardener that shields nails against chipping, splitting, and cracking.
Apply on bare nails or under polish.
Sally Hansen's Hard as Nails Serum delivers hydrolyzed protein in a serum format for deeper restorative care.
Pair it with a hardener for a fuller routine.
How We Chose
We focused on the two most trusted strengthener lines and chose formulas for different needs: weak nails, peeling nails, budget hardening, and a serum treatment.