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GHK-Cu is a naturally occurring copper-binding tripeptide (Gly-His-Lys) shown in laboratory and small clinical studies to support collagen synthesis, wound healing and antioxidant defenses

In the presence of IL-4 and Il-13, the B cell undergoes class switching to produce IgE (43), which can induce the release of pro-inflammatory cytokines and the expression of HLA-DR

There is no single best fertility supplement for everyone, because fertility depends on hormones, ovulation, egg quality, and overall health

Statements Author contributions MdP carried out most of the research, contributed to experimental planning and data analysis, and co-wrote the first draft of the manuscript

doi:10.1289/EHP.1205239 23

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