Fertil Steril 116:365366
Vitex may help with fertility due to its effects on prolactin
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GHK-Cu adds another layer of concern because FDA has specifically discussed immunogenicity risk for injectable GHK-Cu related to potential aggregation and peptide-related impurities
Personal Opinion: Having worked with multiple peptide suppliers over the years, I find that the companies willing to share detailed COA documentation tend to be the ones producing consistently reliable products
Interestingly, retinoids are better paired with some ingredients to minimise skin irritation and further optimise its benefits