Appl Nano (2022) 3(4):20232
Matrixyl 3000 (palmitoyl tripeptide-1 and palmitoyl tripeptide-7), GHK-Cu (copper tripeptide-1), palmitoyl pentapeptide-4, and Argireline (acetyl hexapeptide-8) all have published clinical data supporting their effectiveness
5 The role of hydroxychloroquine and its interaction with doxycycline in these cases cannot be completely ruled out, as cutaneous hyperpigmentation induced by hydroxychloroquine has been described in 13% of treated patients, mainly as a bluish-grey pigmentation, 7 mostly localised at the hard palate, gums, face, and pretibial area
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