Yin preference has no side effects. Its main components are coffee bean concentrated powder, black tea concentrated powder and ginseng powder. These ingredients have obvious effects on exciting the central nervous system, eliminating fatigue and supplementing energy, while ginseng powder has certain conditioning and nourishing effects on human health. The principle of the product is very healthy, so you can use it with confidence. If you often feel tired, have poor memory and low energy, you can choose to try this product.