The speed of weight loss depends on several factors, including the dosage, your body composition, and how much exercise you're getting. If you're using a low-dose regimen peptide injection for weight loss (like one or two injections per week), you can expect to lose one to two pounds per week. If you're using a high-dose peptide injection regimen (like five or more injections per week), you can expect to lose three to five pounds per week.