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There are some facial studies that are promising, but they are quite small and not designed to the strictest standards (by which we mean double blind, placebo controlled.) Another catch is that when it comes to facial anti-aging skin care stimulating hair growth is not really a good thing (unless of course, more facial hair is ok for you)

PMID: 8227353 Secondary Connectivity Map / Broad Transcriptomics Gene Expression Modulation (4,048 Genes) Microarray and CMap analysis reveal that GHK-Cu modulates the expression of 4,048 genes in human fibroblast culturesapproximately 6% of the human genomeaffecting pathways for tissue remodeling, antioxidant defense, anti-inflammatory signaling, and stem cell markers

Results may vary among individuals

In a rat model, melatonin demonstrated inhibition of NMDA receptor activation and subsequent NMDA receptor-mediated Ca 2+ entry into striatal neurons, suggesting a potential protective role [79]