Many commercial "copper peptide" products actually contain Pal-GHK rather than GHK-Cu, but the two compounds have different physicochemical properties and may not behave identically in skin
Within experimental models, the combination is commonly investigated for peptide-mediated signalling dynamics and receptor interaction mechanisms
The caution is primarily about MTC and MEN2 risk, not about everyday hypothyroidism or even most other thyroid cancers
Research context: For evidence on mechanisms, human and preclinical research, limitations, and safety, read Retatrutide Peptide: Benefits, Uses, Side Effects, Dosage, and Research
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