Lysine
Lysine is an essential amino acid important for protein synthesis and immune function, with evidence for cold sore prevention and potential support for bone and mental health.
Lysine (L-lysine) is an essential amino acid, meaning it must be obtained from diet or supplements. It is critical for protein synthesis, hormone and enzyme production, and calcium absorption. While lysine is abundant in animal proteins, supplementation is sometimes used for specific health goals.
Strong evidence supports its role in herpes simplex (cold sores) management; other uses have emerging but less consistent evidence.
Reduces frequency and severity of cold sores (herpes simplex infection)
StrongRegular lysine supplementation may decrease recurrence and severity of herpes simplex labialis (cold sores).
Supports calcium absorption and bone health
ModerateLysine enhances calcium absorption and retention, which may help support bone density when combined with adequate dietary calcium.
May reduce anxiety and stress-related responses
LimitedSome studies suggest lysine, especially alongside arginine, may alleviate anxiety and lower cortisol in stressful conditions.
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