Patients deficient in human growth hormone (HGH) are not receiving essential supplements of the drug. Instead supplies are being used by athletes, dieters and anti-aging clinics, say US doctors. The American Association of Clinical Endocrinologists (AACE), which has just drawn up the first guidelines for HGH use by adults, says that supplies of the hormone are being wasted. Too many people are taking HGH for purposes not approved by regulators.