I am on my last week of humaworm cleanse and I haven't lost any weight. I did get a little constipated this last week, but my energy was alot better. I usually have low energy, so it must have taken a load off somehow. Maybe the parasites were zapping my energy. My husband and I both are on it and I've been on others with no results. We will continue to use humaworm at least a couple of times a year. I am very thin also and do not like using products that may cause weight loss.