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Blood levels of methylmalonate accumulate in B12 deficiency and can be used to differentiate it from folate deficiency (Miller 2009)
Development and validation of a LC-MS/MS method for the quantification of phenolic compounds in human saliva after intake of a procyanidin-rich pine bark extract
doi: 10.1186/s13567-015-0234-8, 188
Analytical procedures may include retention time comparison, spectral confirmation and comparative profiling under controlled laboratory conditions
L-Glutathione is a tripeptide composed of three amino acids: glutamine, cysteine, and glycine
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