Get your best hair color: Use your current color (even if it's dyed) as a gauge when selecting your formula — and never lighten or darken your hair more than two shades at one time. Read the 10 commandments of sinfully rich hair color.
Eat for healthy hair! The best follicle fuel? Omega-3 fatty acids (found in cold-water fish like salmon) and protein (think nuts and cheese), says Oz Garcia, a nutritionist in New York City. More tips about how to keep your hair at its healthiest here.