Elosegui-Artola, A., Oria, R., Chen, Y., Kosmalska, A., Perez-Gonzalez, C., Castro, N., et al
doi:10.1016/s0301-2115(97)00262-5

Injection Technique and Sites Proper subcutaneous injection technique ensures optimal absorption: Recommended injection sites : Lower abdomen (2 inches from navel) Upper thigh (outer quadrant) Upper arm (back of tricep area) Rotation schedule : Change injection sites daily to prevent lipohypertrophy Proper technique : Clean injection site with alcohol swab Pinch skin to create small fold Insert needle at 45-90 degree angle Inject slowly and steadily Hold for 5 seconds before withdrawing Apply gentle pressure (don't rub) Needle specifications : 29-31 gauge, 0.5-1 inch insulin syringes Fasting Requirements For maximum effectiveness , maintain proper fasting windows: Before injection : 2-3 hours fasting (no food or caloric beverages) After injection : 30-60 minutes fasting Avoid : High-fat meals close to injection time Acceptable : Water, black coffee, or tea Glucose and insulin interfere with growth hormone release, making fasting critical for optimal results

Regulation of human penile smooth muscle tone by prostanoid receptors