Is an 8 mm needle too long for peptides?

This site does not recommend a specific needle. Here is what ultrasound scans in adults with diabetes measured. An 8 millimeter needle pushed straight in, without pinching the skin, had about a 25 percent chance of reaching muscle at the thigh and about 9.7 percent at the belly. A 4 millimeter needle at the same spots had 1.6 percent and 0.1 percent. A 4 to 5 millimeter needle at 90 degrees stayed in the fat under the skin in nearly all adults tested. Leaner people and the thigh leave the least room for error. Full walkthrough at /injecting.

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.