glutathione peroxidase and selenium Crystal structure functional characterization of selenocysteine-containing 4 suggests an alternative mechanism of peroxide reduction NO synthases Glutathione peroxidase - Wikipedia

BPC 157 was also shown to time-dependently activate the VEGFR2-Akt-eNOS signalling pathway

Purified Water, Isopropyl Myristate, Cocos Nucifera (Coconut) Oil, Glycerin, 1-Octadecanol Stearic Acid, Simmondsia Chinensis (Jojoba) Seed Oil, Olea Europaea (Olive) Fruit Oil, Sodium Lactate, Steareth-20, Arbutin, Carbomer, Triethanolamine, Niacinamide, Panthenol, Xanthan Gum, ALoe Barbadensis (Aloe Vera) Gel, Glycyrrhiza Uralensis (Licorice) Root Extract, Carica (Papaya) Extract, Phenoxyethanol, Caprylyl Glycol, Potassium Sorbate, Glycolic Acid, Kojic Acid, N Acetyl Glucosamine, Arctostaphylos Uva-Ursi (Bearberry) Extract, EDTA, Retinyl Palmitate (Vitamin A), Glutathione, Tocopheryl Acetate (Vitamin E)

And those are just questions for BPC-157 which seems to be manufactured using solid phase synthesis the risks multiply exponentially for any peptides manufactured biologically

No tolerance development occurs with continued use, and BPC-157 does not suppress natural healing processes