Cysteine is made in the body from serine and methionine and only present in the l-stereoisomer in mammalian proteins
Sample analyses were further conducted using a LC-MS/MS-8050 (Shimadzu Scientific, Inc., Columbia, MD, USA) Triple Quad mass spectrometer (QqQ) equipped with a UHPLC NexeraX2 system
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Neves D, Salazar IL, Almeida RD, Silva RM
A separate comparative study - measuring actual collagen production via skin biopsies - found that 70% of women using GHK-Cu showed increased collagen production after one month, compared to 50% for vitamin C cream and 40% for retinoic acid cream
