Subcutaneous injection delivers medication into the adipose (fat) tissue layer between the dermis and the muscle fascia. Absorption is slower and more sustained than intramuscular, which is desirable for most peptides. SITE SELECTION: (1) Abdomen — most common; use the area 2+ inches around the navel, avoiding the navel itself and any scar tissue. Rotate between left and right sides. (2) Anterior thigh — middle third of the outer thigh. (3) Posterior upper arm — triceps area (may need assistance). (4) Love handles / flanks — for people with adequate subcutaneous tissue. TECHNIQUE: With insulin syringes (29-31 gauge, 8mm-12.7mm needles), a 90-degree angle is standard for most body compositions. For very lean individuals (<10% body fat), use a 45-degree angle to ensure you remain in subcutaneous tissue and do not hit muscle. Pinch a 1-2 inch fold of skin, insert needle, inject slowly over 5-10 seconds, pause 5-10 seconds with needle in (prevents leakback), withdraw, and release the skin fold. Apply gentle pressure with a clean cotton ball or gauze — do NOT rub, as this can increase bruising and may disperse the peptide from the depot. ABSORPTION RATE: SubQ absorption varies by site — abdominal > arm > thigh. Blood flow, temperature, and exercise affect absorption. Cold peptide from the fridge may sting more — some users warm the syringe in their hand for 30 seconds before injecting.
injection
Subcutaneous (SubQ) Injection Technique
💡 Tips
ROTATION IS KEY: Never inject the same exact spot twice in a row. Develop a rotation pattern (e.g., left abdomen → right abdomen → left thigh → right thigh). This prevents lipohypertrophy (hardened fat deposits from repeated injection at the same site) and lipodystrophy. If you notice hard lumps or dents in your injection sites, you are not rotating enough. PAIN MINIMIZATION: (1) Let alcohol dry completely before injecting — wet alcohol stings. (2) Use the smallest gauge needle available (31G is ideal). (3) Inject at room temperature if possible. (4) Relax the muscle at the injection site. (5) Insert the needle quickly and confidently — hesitation causes more pain. (6) Ice the site for 30 seconds before if you are needle-sensitive.
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