research-methods
Subcutaneous Injection
Definition
Subcutaneous (SC or SubQ) injection is a route of administration in which a substance is delivered into the subcutaneous tissue layer (hypodermis) between the skin and underlying muscle. This route provides slower, more sustained absorption compared to intravenous or intramuscular injection, resulting in a depot effect that can extend the duration of action. Subcutaneous injection is the most common administration route for research peptides due to its ease of use, reliable absorption, avoidance of first-pass metabolism, and suitability for self-administration in clinical study settings.