Calotren is a dietary supplement that claims to promote weight loss and improve overall health by boosting metabolism and increasing lean muscle mass. It is made from collagen hydrolysate, a protein that is believed to support weight loss by increasing the body's ability to burn fat and build muscle. However, there is limited scientific evidence to support these claims, and the effectiveness of Calotren as a weight loss supplement is still debated among health experts. It is important to consult with a healthcare professional before starting any new supplement regimen.