The engagement of hCG drops requires the individual to follow the hCG diet as created by Dr. A.T.W. Simeons. The entire protocol basically centers on a very low calorie diet which limits the user to five hundred calories only. This does not run for the entire course though. The user would only need to adhere to the five hundred calorie diet from day three of the diet up to day twenty one or if the target goal is more difficult, up to day forty.

Once the last phase of the diet protocol comes into effect, the individual will no longer be required to take the hCG drops. Instead, the individual will be required to focus on increasing the calorie intake from five hundred to that of eight hundred for women and one thousand for men. By this time, the focus of the diet will be on regulating and maintaining the target weight as achieved by the individual.

The use of the hCG drops is not really going to be that effective if not used alongside the hCG diet. This is because the diet protocol was specifically setup to capitalize on how the hCG hormone works.