Home Sapphire Labs Advanced peptides for targeted weight loss. Learn More About Us Sapphire Laboratories crafts pharmaceutical-grade peptides, focusing on our exclusive GLP-4 formula for effective, targeted weight loss. Learn More Our Services Pharmaceutical-grade peptides crafted with strict quality controls. Cutting-edge research on our proprietary GLP-4 weight loss peptide. Cutting-edge research on our proprietary GLP-4 weight loss peptide. Real Voices Since starting GLP-4, I’ve lost fat without losing muscle—feeling stronger every day. The GLP-4 formula helped me shed stubborn weight while keeping my energy up.