05
Injection Technique
SubQ and IM — step by step
Most peptides are subcutaneous (SubQ). SubQ means injecting into the fat layer just under your skin — not muscle, not a vein. This is the correct route for BPC-157, TB-500, Semaglutide, Ipamorelin, CJC-1295, Epitalon, and most other commonly used peptides. Intramuscular (IM) injection is used for some compounds (Cerebrolysin, some TB-500 protocols) and requires a different technique. Confirm which route is appropriate for your specific compound before injecting.
SubQ Injection — Step by Step
1
Draw up your dose
Using a fresh insulin syringe, draw up the calculated number of units. Draw slightly more than needed, then push the excess out to reach the exact mark. Remove any air bubbles by flicking the syringe gently and pushing the plunger up.
2
Choose and clean your site
Select your injection site — abdomen (2+ inches from navel), outer thigh, or outer upper arm. Wipe with a fresh alcohol swab in a single outward motion. Wait 10 seconds for complete drying.
3
Pinch and insert
Pinch 1–2 inches of skin firmly between thumb and index finger. Insert the needle at a 45° angle (some practitioners use 90° — both are correct for SubQ). Insert the full length of the needle smoothly in a single motion. Do not hesitate mid-insertion.
4
Inject slowly
Release the pinch. Depress the plunger slowly and steadily — count to 5. Rushing the injection causes discomfort and can cause the medication to pool under the skin rather than disperse.
5
Remove and apply gentle pressure
Remove the needle at the same angle as entry. Apply gentle pressure with a clean cotton ball or gauze — do not rub. Rubbing disperses the peptide away from the injection site and causes bruising. Cap the needle immediately using the one-handed scoop technique. Dispose in a sharps container.
⚠ Never Do This
Never rub the injection site. Never inject into the same spot twice in a row. Never reuse a needle. Never inject if you see blood flash into the syringe (withdraw, apply pressure, use a new syringe at a new site).
IM Injection — Key Differences
Intramuscular injection delivers directly into muscle tissue. It is used for certain compounds (Cerebrolysin, some TB-500 protocols, some clinics use IM for all peptides). The principles are the same but the technique differs in angle and site selection.
1
Site selection
Vastus lateralis (outer thigh) is safest for self-injection — large muscle, away from major vessels. Deltoid (shoulder) is also accessible. Never inject into the buttock (gluteus) without training — the sciatic nerve runs close to common injection landmarks.
2
Needle length and angle
IM requires a longer needle than SubQ — typically 25–27 gauge, 1 inch for average body composition. Insert at 90° angle (perpendicular to skin surface) for IM vs 45° for SubQ. The needle must reach muscle, not deposit in fat.
3
Aspiration (check for blood)
Before depressing the plunger, pull back slightly — if blood flashes into the syringe, withdraw immediately. You have entered a vessel. Apply pressure, dispose of the syringe, and try again at a new site with fresh equipment. No blood = proceed to inject slowly.
Recommendation: If you are new to peptide injection, start with SubQ. The vast majority of peptides work well SubQ, the technique is simpler, complications are rarer, and it is more forgiving of technique imperfections. Switch to IM only when required by your specific compound or protocol, and ideally after training from a healthcare professional.