Most women are deficient in the one mineral that helps you fall asleep and stay calm under pressure.

Magnesium. About 68% of Americans don't get enough from food alone. It's involved in over 300 enzymatic processes in the body, including the ones that govern cortisol regulation and melatonin production. Oral supplements can cause GI issues for some people. Topical magnesium — applied to the skin before bed — is gentler on the gut and absorbs well. I put it on my legs and feet as part of my wind-down ritual. It's not magic. But it's one of the most evidence-supported interventions for sleep quality that doesn't require a prescription.