Not reliable, don't listen to random letters, those are false, advertisements are deceptive, and if you believe them, you will be arrested. It is suggested to focus on adjusting a balanced diet, strengthening exercise, relaxing body and mind and ensuring sleep. The principle is that consumption is greater than intake. Eat well for breakfast, and eat little or nothing for dinner. The most important thing is to lose weight safely. Don't take medicine indiscriminately, it will be troublesome to confuse endocrine.