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J Neurochem 97, 16111626

Having worked in the food industry I know that there is no set method of determining shelf life and it is up to the producer to chose what "use by" or "best before" dates they want to put on their stock, based on their own view of the product under normal conditions

[DOI] [PubMed] [Google Scholar] 11.Zhang Y, Proenca R, Maffei M, Barone M, Leopold L, Friedman JM

For daily shampoo users : Apply once daily at night for the first week after washing with our GHK-Cu Shampoo

They are: Contaminated or mislabelled compounded products research-grade vs pharmaceutical-grade manufacturing matters enormously Incorrect dosing without clinical oversight, patients routinely underdose (no effect) or overdose (unknown risk) Drug interactions particularly relevant if you are on GLP-1 therapy, immunosuppressants, or anti-inflammatory medications