Intramuscular (IM) Injection

Most peptide users inject subcutaneously (SubQ), which is simpler and less painful. However, IM injection may be appropriate when:

• Your protocol specifically calls for IM administration
• You need faster absorption (IM absorbs quicker than SubQ)
• The injection volume is larger than 1mL
• A healthcare provider has recommended IM for your specific peptide

• Reconstituted peptide vial
• 3mL syringe with an 18G draw needle (for drawing from vial)
• IM injection needle: 23–25 gauge, 1–1.5 inches
• Alcohol swabs
• Sharps container

Note: For IM, you typically draw with one needle (18G) and inject with a separate, smaller needle (23–25G). This keeps the injection needle sharp.

The deltoid muscle on the outer upper arm is the easiest IM site to reach yourself. Best for smaller volumes (up to 1mL).

1. Find the injection zone — locate the thickest part of your deltoid muscle, about 2–3 finger-widths below the bony point of the shoulder (acromion).
2. Clean the site with an alcohol swab. Let it dry.
3. Spread the skin taut using your non-dominant hand (Z-track technique: pull the skin slightly to one side before inserting).
4. Insert at 90 degrees — push the needle straight in with a smooth, quick motion. Insert to the full depth of the needle.
5. Aspirate — pull back on the plunger slightly for 5 seconds. If blood appears, withdraw and try a new site. If no blood, proceed.
6. Inject slowly — push the plunger at a steady pace over 5–10 seconds.
7. Withdraw and release — pull the needle straight out, then release the skin. Apply gentle pressure with a swab.

The ventrogluteal site (hip area) is the preferred site for larger IM volumes. It's harder to reach yourself but has fewer nerves and blood vessels than the traditional dorsogluteal site.

1. Find the injection zone — place the heel of your opposite hand on the greater trochanter (bony prominence of the hip). Point your index finger toward the anterior superior iliac spine (front hip bone). Spread your middle finger toward the iliac crest. The injection zone is the V-shape between your two fingers.
2. Clean the site with an alcohol swab. Let it dry.
3. Spread the skin taut using the Z-track method.
4. Insert the needle at 90 degrees to the full depth.
5. Aspirate, check for blood, then inject slowly over 10 seconds.
6. Withdraw straight out and apply gentle pressure.

• Use the Z-track technique — pull the skin to one side before inserting. When you release after withdrawal, the needle track seals and prevents leakage.
• Always aspirate — this is more important for IM than SubQ. You need to confirm you're not in a blood vessel.
• Don't inject too fast — IM injections that are rushed cause more post-injection soreness (PIP).
• Massage gently after — light massage helps distribute the peptide and reduce soreness.
• Rotate between deltoids and glutes — never inject the same muscle twice in a row.