Lower stress levels with blue

Like a cloudless sky or a pool of water, blue evokes feelings of peace and tranquility and has been shown to lower pulse rate and body temperature.

One we like: Deborah Lippmann Gel Lab Pro in What’s Good (DeborahLippmann.com). It’s enriched with biotin and green tea, which promote growth and neutralize the free radicals that can weaken nails and lead to breakage.