Clearance Rate
Also known as: CL · systemic clearance
The volume of plasma cleared of a peptide per unit time, typically by renal filtration, hepatic metabolism, or proteolytic degradation.
Clearance is the engine driving half-life. A high-clearance peptide is eliminated rapidly and requires frequent redosing; a low-clearance peptide lingers. Most therapeutic peptides are cleared through a combination of renal excretion and enzymatic degradation by proteases in plasma and tissue. This is why GLP-1 analogs are engineered with fatty-acid side chains — the lipid tail binds serum albumin and shields the peptide from proteolysis, dramatically lowering clearance and extending half-life from minutes to days.
Clearance is also the lever most affected by renal function. Researchers with impaired kidney function will see elevated exposure at identical doses, which is why baseline bloodwork matters before any multi-week protocol.
Related Terms
Half-Life
The time required for the concentration of a peptide in the body to fall to half of its peak value.
Volume of Distribution
A theoretical volume describing how extensively a peptide distributes from plasma into tissues.
AUC (Area Under Curve)
The integrated total exposure of the body to a peptide over time, calculated as the area under the concentration-time curve.
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