Subcutaneous Injection Technique
Subcutaneous delivery places the compound in the fatty tissue layer beneath the skin. It is the most common route for peptide research — consistent absorption, low complication rate, and straightforward technique.
⚠️ Research Use Only
All products sold by FenaLife are intended strictly for laboratory and academic research purposes. Not for human consumption, injection, or ingestion. These statements have not been evaluated by the FDA.
Subcutaneous Injection Step by Step
1
Select and clean the site
Abdomen (2 inches from navel), outer thigh, or upper arm. Wipe with 70% IPA swab, allow 30 seconds to dry.
2
Pinch the tissue
Use thumb and forefinger to lift 1–2 inches of skin and subcutaneous tissue away from the muscle underneath.
3
Insert at 45 degrees
For standard needle lengths (5/16 inch). Use 90 degrees only with 4mm or shorter needles. Smooth, steady entry.
4
Release the pinch
Once the needle is seated, release the skin fold before depressing the plunger.
5
Inject slowly
Depress the plunger over 5–10 seconds. Rapid injection increases pressure and tissue damage.
6
Withdraw and apply light pressure
Pull straight back along the entry angle. Apply a dry cotton ball with gentle pressure for 10–15 seconds. Do not rub — it disperses the depot.
7
Rotate sites
Never inject the same spot twice in a row. Maintain a rotation map to prevent lipodystrophy.
Intramuscular Injection Technique
Intramuscular delivery reaches vascular muscle tissue directly, producing faster absorption than subcutaneous for most compounds. Accurate site identification is non-negotiable — incorrect placement hits nerves and blood vessels.
IM Site Selection
Vastus Lateralis
Outer thigh, middle third. Large muscle, no major nerves nearby. Preferred for self-administration research.
Ventrogluteal
Hip — anterior superior iliac spine landmark. Lowest infection risk of all IM sites. Requires practice to locate.
Deltoid
Upper outer arm, 2–3 finger-widths below acromion. Small muscle — limit to 1mL maximum volume.
Intramuscular Injection Step by Step
1
Landmark the site
Identify the anatomical landmarks for your chosen muscle. Incorrect placement hits nerves or bone.
2
Spread the skin
Use the Z-track method: pull skin 1–2 inches laterally before insertion to prevent compound tracking back along the needle path.
3
Insert at 90 degrees
Smooth, swift entry perpendicular to the skin surface. For the deltoid, a slight 5–10 degree angle toward the shoulder reduces discomfort.
4
Aspirate (optional)
Pull back the plunger slightly. No blood return confirms you are not in a vessel. Standard practice varies by protocol.
5
Inject at consistent rate
1mL over 10 seconds minimum. Faster injection causes pressure pain and muscle damage.
6
Release Z-track on withdrawal
Withdraw the needle, then release the displaced skin. This closes the injection track and reduces leakage.
Absorption Speed by Route
IntravenousImmediate (not covered here)
Intramuscular15–30 minutes
Subcutaneous30–90 minutes
IntradermalHours — site-specific
Conclusion
Consistent technique at the injection step keeps absorption predictable and protects tissue integrity across a research protocol. Browse FenaLife’s full peptide catalog for research-grade compounds with HPLC-verified purity.
⚠️ Research Use Only
All products sold by FenaLife are intended strictly for laboratory and academic research purposes. Not for human consumption, injection, or ingestion. These statements have not been evaluated by the FDA.