Subcutaneous delivery is the standard laboratory method for peptide compound application. By depositing the solution into the fatty layer between skin and muscle tissue, sustained systemic absorption is achieved via the rich capillary network in the adipose tissue.
📐 Why Not Intramuscular?
Intramuscular (IM) delivery leads to rapid absorption spikes and faster clearance. Most research peptides are designed for the slower, more stable release profile provided by SQ application in preclinical models.
Precision site selection minimizes inflammation and ensures consistent pharmacokinetic results.
Primary Sites
- Abdomen (2" from navel)
- Upper outer thighs
- Back of upper arms
Site Rotation
The "Grid Method": Rotate sites by at least 1 inch each session to prevent lipohypertrophy (tissue irregularities).
Adjust your technique based on the specific subcutaneous depth of the subject.
🔬 Subcutaneous Delivery Angle & Depth Advisor
45°
Short (8mm)
Angle prevents intramuscular penetration in low-adipose tissue models.
⚠️ The "Pinch" Technique
For subjects with very low body fat, gently pinch a 1-inch fold of skin to lift the adipose tissue away from the underlying muscle before inserting the needle at a 45° angle.
- Preparation: Clean the application site with 70% IPA and allow to air-dry completely.
- Insertion: Insert the needle in one swift, controlled motion.
- Delivery: Depress the plunger slowly and steadily. Rapid delivery can cause tissue disruption.
- Withdrawal: Remove the needle at the same angle it was inserted. Apply light pressure (do not rub) with a sterile gauze pad.
🔬 Z-Track (Optional)
For larger volumes, use a modified Z-track method by slightly displacing the skin before entry. This "locks" the solution in the tissue and prevents leakage.