can vitamin c help prevent cracked lips Dry Be a Sign of Deficiency? Vitamin C Rose Lip Kit
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doi: 10.1093/advances/nmab010

Vegans had levels above the reference range for alanine, glutamate, glycine, leucine, ornithine (a non-protein amino acid), phenylalanine, and serine
doi: 10.1038/aja.2009.29

This is done to observe how the body is reacting to it
Pan Y, Li H, Wang Y, Meng X, Wang Y
Reference interval for the apolipoprotein B-48 concentration in healthy Japanese individuals
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