If your skin is highly reactive and prone to irritation, Sass says yogurt and kefir are your solution. "Both are rich in probiotics — 'friendly' bacteria linked to better digestion, immunity, and also a reduction in skin sensitivity and inflammation."
Lactose-intolerant? That's okay, Sass says the same bacteria are used to make soy and coconut milk yogurt, so even if you don't do dairy you can still reap the benefits.
Illustrations by Naomi Abel