SubQ vs intramuscular
Subcutaneous (subQ) goes into the fat layer just under the skin — common for peptides, GLP-1s, and HCG, using a short fine needle. Intramuscular (IM) goes deeper into muscle and is typical for oil-based compounds. The two use different needles, sites, and angles, so know which one a given compound calls for.
Needle choice
Oil-based IM shots are often drawn with a wider gauge (to pull thick oil) and injected with a finer one to reduce discomfort. SubQ injections use short insulin needles. A fresh, sharp needle every time hurts less and is more hygienic — never reuse.
Clean technique
Wash hands, swab the stopper and the site with alcohol and let it dry. Many people aspirate (pull back slightly) before an IM injection to confirm they are not in a vessel. Inject smoothly, withdraw, and apply light pressure. Dispose of sharps in a proper container.
Why rotation matters
Hitting the same spot repeatedly builds up scar tissue and can cause lumps, poor absorption, and pain. Rotating across available sites — and giving each one time to recover — keeps tissue healthy and absorption consistent. The site rotation tool logs where you last injected so you are not guessing.
When something is off
Mild redness or a small bump can be normal. Spreading warmth, significant swelling, fever, or severe pain are not — those warrant medical attention. This guide is about technique and hygiene, not a substitute for a clinician.