Essential protein-building amino acid
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About Lysine
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About Lysine
Overview and History
Lysine is one of the essential, protein-building amino acids that must be obtained from the diet. Chemically it is a basic (positively charged) amino acid and one of the 20 standard amino acids incorporated into proteins. Early nutrition research identified lysine as required for growth and maintenance, and it remains a key marker of protein and amino acid status.
Biologically, lysine serves as a building block for structural proteins like collagen, is a precursor for carnitine (important for fatty acid transport), and is frequently the site of post-translational modifications on proteins that affect their function. Lysine levels reflect intake, absorption, transport, and metabolic handling, and they interact with broader nitrogen and amino acid metabolism in the body.
Interpreting Highs and Lows
Higher-than-expected blood lysine can reflect recent high-protein intake, altered clearance or catabolism, or shifts in amino acid transport and metabolism. Elevated values are best interpreted alongside kidney markers, other amino acids, and dietary information.
Lower-than-expected lysine may indicate inadequate dietary intake, reduced absorption, increased utilization or loss, or broader imbalances in protein metabolism. Low values should be evaluated in the context of other amino acids, nutrient status, and clinical factors to clarify patterns and potential drivers.
Featured Test
Lysine is included in the Nutrient Zoomer to evaluate amino acid status and protein-related metabolic pathways. It helps reveal dietary adequacy, metabolic demand, and interactions with collagen and carnitine pathways, adding context to genetic and nutrient patterns that guide personalized nutrition planning.
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Mary Beth Augustine
DCN, RDN, FAND- Lead Clinical Educator
Suzanne Barker
MS, RDN, LD, CTTS, CGP- Clinical Educator
Suzette Garcia
MSc- MHNE- Clinical Educator
Brooke Mader Ganev
MS, CNS, LDN, FDN- Clinical Educator
Adair Anderson
MS, RDN, LDN- Clinical Educator
Lillie Luu Nguyen
DCN, CNS, LDN- Clinical Educator
Jason Barker
ND- Clinical Educator
Emaline Brown
ND- Clinical Educator
Dana Filatova
DCN, CNS, LDN- Clinical Educator
Jessy Dhanjal
ND- Clinical Educator
Nour Amri
MS, LDN, CNS, CKNS- Clinical Educator
