The condition where circulating and bioavailable levels of all requisite endogenous hormones—including sex steroids, thyroid hormones, and adrenal metabolites—are present within the established optimal functional range for an individual’s age and physiological goals. Sufficiency implies adequate support for anabolic drive, metabolic regulation, and mood stabilization. It is a state of comprehensive endocrine balance.
Origin
This concept originates from clinical endocrinology, emphasizing the need for adequate physiological signaling rather than simply the absence of overt deficiency. It shifts the clinical focus from pathology correction to proactive optimization.
Mechanism
Sufficiency requires not only adequate production by the primary glands but also effective transport, correct receptor expression, and appropriate downstream signaling efficiency. For example, sufficient free testosterone requires adequate total testosterone, low sex-hormone binding globulin (SHBG), and functional androgen receptors. Interventions aim to secure this functional supply across the entire endocrine spectrum.
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