The Chinese medicine maca is usually about 20 yuan a pound, maca has a very good effect of tonifying the kidney and aphrodisiac. Generally there is no effect on memory. Advice: Be sure to have 7-8 hours of sleep every day. You can often use wolfberry, cinnamon, acacia and so on bubble water to drink. Helps sleep role. Can increase physical exercise. This improves blood circulation and metabolism. Promote blood supply to the brain. Enhance your memory