The diet using hCG is safe if used under medical supervision from a knowledgeable physician. Prior to starting the diet, medical clearance is required due to potential side effects from medications like hCG. The guidelines for the hCG diet include limiting calories to at least 1,100 per day and using authentic hCG for 21 to 40 days as part of a customized weight loss plan. While the diet has helped many patients lose weight safely, medical advice should always be sought before beginning any weight loss program.