selenium is part of the glutathione peroxidase enzyme system and Selenoproteins: Mechanisms, Health Functions, and Emerging Applications 9.4: Selenium - Medicine LibreTexts

The evidence combined BPC 157 with the time-dependently activated VEGFR2-Akt-eNOS signaling pathway, the increase in endothelial tube formation (chick chorioallantoic membrane (CAM)) (both suppressed by Dynasore, an endocytosis inhibitor), the increased expression and internalization of VEGFR2, and essential acceleration of blood flow recovery and vessel number to rescue hind limb ischemia in rats with a completely excised femoral artery [94]

This can lead to brighter, more even-toned skin

doi: 10.1016/j.addr.2022.114422, 47

Protects Against Chemotherapy Side Effects Reduces nerve damage, fatigue, and organ toxicity

And as for the peptide itself, genetic material that codes for its unique amino acid sequence hasnt been found in the human genome or gut microbiome

Most users begin seeing improvements during this phase