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While every cell in your body produces it, your levels can be depleted by stress, environmental factors, and the natural process of ageing

Characterization and autoradiographic localization of the epidermal growth factor receptor in the jejunum of neonatal and weaned pigs

doi: 10.1016/0024-3205(85)90312-1

Liu J, Yuan Y, Cheng Y, Fu D, Chen Z, Wang Y

This batch is verified at 99.643% purity by third-party analytical testing (HPLC for purity, mass spectrometry for identity)

The systematic review notes that anywhere between 12% and 58% of ergo-nutritional supplements are contaminated with other, oftentimes unsafe, substances. Research peptides operate with even less oversight than supplements