Collagen is the most plentiful protein in the human body, comprising about 25 percent of your body's total protein level. It helps keep your skin elastic and young-looking and makes up the connective tissue in your body. While there are many sources that tout collagen's benefits for helping you lose weight, there is little scientific data to back up these claims. Be sure that you check with your doctor before starting a liquid collagen supplement program for weight loss. The Rationale Because collagen is effective at helping retain lean muscle and increasing energy, some people suggest that taking a liquid collagen supplement can help you lose weight. According to a press release issued by ModoSpot.com, collagen can give your body more energy to use during exercise than many of the popular energy drinks on the market today. ModoSpot also claims that collagen supplements help you build muscle and avoid storing the excess energy as fat. According to Dr. Dave Nelson, your b...