Black Red raisins contain antioxidants, vitamins of groups A, B, C, PP, and iron, and calcium, and magnesium. Carbohydrates in its composition are easily processed by the body, unlike sugars from common sweets. Often, doctors advise their patients with nervousness, irritability and insomnia to buy raisins of the Sayaki variety or another similar to it, and eat a small handful every day.