I am of the opinion that it is the severely restrictive diet that causes the rapid weight gain that will not, by the way, remain with you for very long. Also, I went to search for your product, was blocked by malware. Tried again. There were no potential side-effects listed on the page. That is so unethical. I took a look at some of the ads on the page. All of these products are in the supplements, any can color your bowels and I would not advise taking most of them: Alfalfa 2X - Alfalfa is one of the strongest homeopathic hunger suppressors and it has a marked effect on general feeling of well being and vigor. Calcium Carbonate 12X- Reduces stomach cramping and ravenous hunger feelings. Chromium 4X - Normalizes sugar metabolism and stabilizes highs and lows by increasing glucose storage in the liver. Cina 3X - Reduces frequent hunger urges and certain cravings. Croton Tiglium 4x- Reduces feelings of burning in esophagus and stomach. Ipecac 4x - Calms stomach. Reduces cravings. Fucus 3X - Remedy for obesity. Natural source of organic iodine. Improves thyroid activity. Stimulates metabolic rate and increases circulation. Lithium 3x - Reduces cravings and improves mental mood. Nux Vomica 4x - Reduces ravenous hunger and calms the stomach. Placenta 3x - Controls the metabolism in pregnancy and breaks down body fat stores to feed the unborn baby. Sulphur 4X - Reduces desires for sweets and excess hunger. Thyroid 3x - Manufactures important thyroid hormones T3 and T4 which regulate the metabolism of the body. I have not found any evidence to any of the claims made on this website. And yes, this stuff could be giving you stomach pains and headaches. Have you considered bariatric surgery after a traditional course of weight loss therapy? Do you want to write back and tell me what you have tried? I am concerned for you. Healthy Regards, Kathryn Shattler, MS,RDN