What Is Subcutaneous Injection?
A subcutaneous injection delivers a substance into the fatty tissue layer between the skin and muscle. This is the most common administration route for research peptides.
Detailed Explanation
Subcutaneous (SubQ) injection places the peptide solution into the adipose tissue beneath the skin, where it is absorbed gradually into the bloodstream through surrounding capillaries. Common injection sites include the abdominal area (2 inches from the navel), the front of the thigh, and the back of the upper arm. Insulin syringes (29-31 gauge, 0.5-1 mL) are standard, with the needle inserted at a 45 to 90 degree angle depending on the amount of subcutaneous tissue. Absorption from subcutaneous sites is slower than intramuscular injection, providing more sustained blood levels. Site rotation is important to prevent lipohypertrophy (tissue hardening) at frequently used locations.
Related Terms
Intramuscular Injection
An intramuscular (IM) injection delivers a substance directly into muscle tissue. Some peptides use IM injection for faster absorption compared to subcutaneous routes.
Insulin Syringe
Insulin syringes are small-volume syringes (typically 0.3-1 mL) with fine gauge needles (29-31G) designed for precise measurement of small doses. They are the standard tool for peptide injection.
Reconstitution
Reconstitution is the process of dissolving a lyophilized (freeze-dried) peptide powder into a sterile solution for research use. Bacteriostatic water is the most common reconstitution solvent.
Bioavailability
Bioavailability is the proportion of an administered peptide that reaches systemic circulation in its active form. Subcutaneous injection typically provides 65-95% bioavailability for peptides.
Research & Educational Use Only
All content is for informational and research purposes only. This site does not provide medical advice, diagnosis, or treatment. Consult a qualified healthcare professional before using any peptide or supplement.
The information presented here is compiled from published research studies and is intended for informational purposes only. Individual results may vary. Always consult with a licensed healthcare provider.