Safe. Professor Yan's slimming products are the brand of Guangdong Tongrui Biotechnology Co., Ltd., and the products include Professor Yan's meal replacement, Professor Yan's light roasted coffee, Professor Yan's Yiqingyuan 0 drink and so on. Professor Yan advocates a life attitude of "luxury, fashion, health and happiness" and a life concept of "thinness, slowness, lightness, novelty and coolness", sharing health and conveying happiness, and "living the best posture of life", which is Professor Yan's fitness attitude, while Professor Yan advocates a healthy, young, weighty, textured, intrinsic and energetic lifestyle. Professor Yan's weight loss products are mainly regulated by meal replacement. Meal replacement products will not cause a lot of fat accumulation after eating, but also burn fat. But try not to eat it in large quantities for a long time, and at the same time, it must be ingested under the guidance of professionals. In addition, Professor Yan's products are zero fat, zero calories and delicious, which can effectively block the absorption of calories, thus achieving the effect of losing weight.