Is an 8 mm needle too long for peptides?

This site does not recommend a specific needle. What ultrasound work in adults with diabetes measured: an 8 millimeter needle inserted straight in without a pinch carried about a 25 percent chance of reaching muscle at the thigh and about 9.7 percent at the abdomen, against 1.6 percent and 0.1 percent for a 4 millimeter needle at the same sites. A 4 to 5 millimeter needle at 90 degrees stayed subcutaneous in virtually all adults tested. Leaner people and the thigh are the least forgiving cases. 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.