Best Peptides for Weight Loss Research 2026

Tirzepatide is the most clinically studied peptide for metabolic and weight loss research. As a dual GIP/GLP-1 receptor agonist, it has been extensively investigated in the SURPASS and SURMOUNT clinical trial programmes for its effects on appetite signalling, glucose homeostasis, and body composition.

The ORYN Tirzepatide Pen contains 20mg in a reusable multi-dose system for 30 days. The MediT Pen contains 40mg Tirzepatide in a prefilled single-use pen designed for once-weekly administration. Both are >99% purity and GMP certified.

NAD+ is a critical coenzyme in mitochondrial metabolism and sirtuin activation pathways. While not a direct appetite modulator like Tirzepatide, NAD+ research suggests roles in metabolic flexibility, cellular energy production, and metabolic pathway regulation relevant to body composition studies.

Researchers sometimes investigate multiple metabolic pathways simultaneously. Tirzepatide targets incretin receptors for appetite and glucose modulation, while NAD+ supports mitochondrial energy metabolism. The compounds act through independent mechanisms, making combination protocols a valid area of investigation.