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Peptides like GHK-Cu (copper tripeptide-1) are legal for cosmetic use and commonly found in skin care products

However, do not discontinue prescribed B12 treatment without medical advice, particularly if you have pernicious anaemia or confirmed deficiency, as untreated B12 deficiency can lead to irreversible neurological damage

Panuszko, A., Szymczak, M., Duewska, J., Godlewska, J., Kuffel, A., & Brudziak, P

Since your skin is composed of about 70-80% collagen , its main job is to maintain firmness, elasticity, and a youthful appearance , helping to prevent wrinkles and sagging

The side effects guide discusses GHK-Cu reactions in more detail