Winner

Nailene Titanium Strength, $4
Fragile nails need both strengthening and hydration. This treatment contains protein and calcium for hardening and vitamin E to moisturize. “With two coats, my nails stayed shiny and strong,” reported a tester.
To Buy: Unfortunately, this product is no longer available.

Runner-Up

Jessica Bend Don’t Break, $11
An effective formaldehyde-free strengthener with a hearty moisturizer and wheat protein.
To Buy: www.jessicacosmetics.com.