How long can I take HCG for? The Injections or Drops must be taken for at least 23 days in order to re-set the Hypothalamus gland. However, one should stay on the HCG until you have reached your goal weight.  Some may need to continue using the HCG for a few months, until they reach their goal weight. This depends entirely on how much excess weight you need to lose.  To find out more about the HCG Diet System visit us online or call or WhatsApp us on 0720643948