Organic Nettle Leaves. Nettle has strong antioxidant activity as well as anti-infectious, anti-inflammatory and anti-rheumatic properties. The nettle is also highly diuretic and helps to stimulate the kidneys. Nettle leaves have a high content of Vitamin C, which strengthens the bodyâs defenses and helps better absorption of iron, a high content of Vitamin K, which plays an important role in blood clotting, and B vitamins that benefit the nervous system.