Cycling is a pattern of intermittent use of the supplement, with periodic breaks or rest periods.
Some supplements should be cycled and some, such as vitamins, should not. All hormonal therapies including HGH and HGH releasers should be cycled. Cycling is an effective method of scheduling the hormone enhancement program to work with the natural endocrinal system's regulating process, and not against it. Under certain conditions the body will attempt to raise or lower hormone levels. With long term uninterrupted hormonal injection replacement, a negative feedback loop within the endocrine system begins to emerge where the body's own hormone production diminishes and insensitivity to the hormone arises.