What size needle do you use for peptide injections?

This site does not sell products and does not recommend a specific needle. Research on insulin shots found that a needle 4 to 5 millimeters long, pushed straight in at 90 degrees, stays in the fat under the skin in nearly all adults. Needles 8 millimeters or longer are clearly more likely to reach muscle, especially in the thigh and in thinner people. That is why standard insulin syringes come in roughly the 4 to 12.7 millimeter range.

Full injecting guide: sites, needles, rotation, safety

Educational use only. This database summarizes published research and is not medical advice. Where a dose appears it is a record of what a trial or clinic ran, or what people describe doing, with its source attached. Nothing here is a recommendation for personal use.

Part of injecting: sites, needles and safety. Subcutaneous vs intramuscular, site rotation, lipohypertrophy, needle length and gauge, vial hygiene at injection time, travel syringes, scar tissue, and when to stop and see a clinician. Full walkthrough at /injecting.