A clinical approach that involves alternating periods of intervention (on-cycles) with periods of withdrawal or reduced intervention (off-cycles) for specific peptides, hormones, or supplements. This cycling is employed to maximize long-term efficacy and prevent receptor desensitization or negative feedback loop suppression.
Origin
A term from clinical and performance pharmacology, combining ‘Therapeutic’ (relating to the treatment of disease), ‘Cycling’ (the alternation of use and non-use), and ‘Regimens’ (a prescribed course of action).
Mechanism
Cycling operates on the principle of receptor pharmacology, allowing receptors to upregulate their density and sensitivity during the off-cycle, thereby ensuring a maximal biological response when the compound is reintroduced during the next on-cycle. This strategic intermittent use maintains the body’s endogenous homeostatic capacity and mitigates the risk of long-term dependence or diminished returns.
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