Subcutaneous Injection
An injection technique that delivers a compound into the fatty tissue layer just beneath the skin, above the muscle, typically using a short fine-gauge needle.
Subcutaneous injection is the most common administration route for research peptides because it is relatively painless, easy to self-administer, and provides reliable absorption through the vascular network of the subcutaneous tissue layer. Common injection sites include the abdomen (pinching skin away from the navel), the outer thigh, and the upper arm.
A short needle (typically 29–31 gauge, 4–8mm length) is used with a syringe calibrated for insulin or low-volume use. The compound is absorbed more slowly via the subcutaneous route compared to intramuscular injection, generally resulting in a smoother, more sustained release into circulation. Rotating injection sites is recommended to prevent localized tissue irritation or lipohypertrophy with frequent dosing schedules.