Lysine is an essential amino acid that must be obtained through diet, as the body cannot produce it. Its critical roles include:
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Supporting immune function by inhibiting viral replication (notably HSV) and serving as an antibody precursor
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Maintaining structural integrity through collagen synthesis for skin, bones, and connective tissues
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Enhancing metabolic function via carnitine production (fatty acid metabolism) and calcium absorption
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Promoting tissue repair as a fundamental component of muscle and enzyme systems
Optimal dietary sources: Meat, poultry, fish, dairy, eggs, legumes (especially soy), nuts, and seeds.
Deficiency may lead to weakened immunity, impaired collagen formation, reduced calcium absorption, and fatigue.