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While the passive technique focuses on drug and vehicle interaction and optimization to affect the stratum corneum structure, the active approach utilizes external energy to facilitate the transportation of drugs through the skin or by physically disrupting the outermost layer of the skin, known as the stratum corneum [230, 231]

GHK-Cu provides that guidance

FDA issued warning letters that used boilerplate language, citing the companies for illegally marketing the drugs

In clinical trials, the most common side effect was headaches, occurring in 6% of users, followed by drooping eyelids in 2% of users, and facial asymmetry in 1% of users