One common myth is that you can mix and match any peptides you want
Molecules 15:432441 Chang KT, Lii CK, Tsai CW, Yang AJ, Chen HW (2008) Modulation of the expression of the class of glutathione S-tranferase by Adrographis paniculata extracts and adrographolide

Tags: Brightens skin and evens out skin tone Reduces melasma and stubborn pigmentation Strong antioxidant support to fight free radicals Enhances collagen production and skin texture Safe oral alternative to chemical peels and injections Usage Information Dosage Adults: 1 tablet once or twice daily after meals For best results, use for at least 23 months Use with broad-spectrum sunscreen to prevent recurrence of pigmentation Side Effects Mild gastric discomfort or nausea Headache (rare) Menstrual irregularities (rare, from tranexamic acid) Allergic rash (uncommon) Contraindications History of thrombosis or clotting disorders Severe kidney disease Pregnancy and breastfeeding (use only if prescribed) Known hypersensitivity to any of the ingredients Availability tranexamic acid glutathione vitamin C skin whitening, oral depigmentation supplement, pigmentation removal tablets, antioxidant skin brightening formula

Copper-catalyzed oxidation of methionine and histidine side chains is well-documented chemistry, and so is copper-mediated cleavage of a peptide backbone at coordination sites
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Intramuscular injection is unnecessary and offers no advantage for this peptide