Most research peptides in this catalog are handled subcutaneously (SubQ) — into the layer just under the skin.
Standard sites
- Abdomen — fastest, most consistent absorption (avoid the area immediately around the navel)
- Outer thigh — slower absorption
- Upper arm — convenient; absorption varies
Rotation
Rotate sites with each administration — never the same site twice in a row. Rotation keeps absorption consistent and avoids local tissue irritation.
Technique notes by class
- GLP-1 / GIP agonists (Tirzepatide, Retatrutide, Semaglutide): SubQ only — never intramuscular.
- Repair peptides (BPC-157, TB-500): systemic into abdomen, or localized SubQ near the target tissue — never directly into a joint space.
- NAD+: inject slowly over 20–30 seconds to minimize flush; a slightly wider 25–27g needle is more comfortable for larger volumes.
- GHK-Cu: distribute scalp injections in a grid for even coverage; a faint blue tint is the copper chelate, not contamination.
Research reference only. Laboratory handling guidance. Not for human use.