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Theres also some concern that copper peptides could lose their efficacy when layered with strong acids, vitamin C, or retinoids
GSH levels in the body can also decrease with inadequate protein intake, particularly diets that are low in the amino acid cysteine
A native peptide sequence in circulation is a target peptidases cleave it, and if it is small enough the kidneys filter it out
However, tumor cells often compete with normal cells, including immune cells, for nutrients in the tumor microenvironment (Buck et al., 2017)
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