Nettles are a “perfect food,” containing vitamin A, vitamin B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (panothenic acid), vitamin C, vitamin D, vitamin E, vitamin K, acetycholine, calcium, chlorophyll, chromium, iron, magnesium, potassium, selenium, serotonin, sulphur and zinc. And like only a handful of plants, they pack plenty of protein.