Where to inject peptides for best results. Subcutaneous injection site guide with rotation recommendations.
Most peptides are administered via subcutaneous (subQ) injection, meaning the needle goes into the fatty tissue just beneath the skin. This is different from intramuscular (IM) injection, which goes deeper into muscle tissue. SubQ injections use short, thin insulin needles (29-31 gauge) and are generally painless.
The most common injection site. Pinch a fold of skin at least 2 inches from your navel. Avoid the area directly around the belly button. Large surface area makes rotation easy.
Use the outer middle third of the thigh. Pinch a fold of skin and inject at a 45-90 degree angle. Good alternative when the abdomen needs a break from rotation.
Use the fatty area on the back of the upper arm, between the shoulder and elbow. May require help from another person for proper technique.
For healing peptides like BPC-157, inject subcutaneously within a few inches of the injury. Do NOT inject into joints, tendons, or muscle directly — stay in the fat layer.
Injecting in the same spot repeatedly can cause lipohypertrophy (localized fat buildup), scar tissue, and reduced absorption. Rotate between different areas and alternate sides (left/right) with each injection. A simple rotation pattern: right abdomen → left abdomen → right thigh → left thigh → repeat.