GF-9 | CLINICALLY TESTED MAXIMUM STRENGTH FORMULA* | 682% MEAN INCREASE IN SERUM PEPTIDE LEVELS* PEAK SERUM PEPTIDE LEVELS ASSOCIATED WITH: LEAN MUSCLE REDUCED BODY FAT PHYSICAL PERFORMANCE ENERGY & DRIVE STRONGER BONES & JOINTS RECOVERY & IMPROVED SLEEP But after 25, your production of this peptide slows dramatically--making it harder to keep up, ..