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While there is no officially established "upper limit" by the FDA, most clinical research suggests that up to 2,000 mg per day is well-tolerated by most adults for short periods

This versatile compound is now actively investigated for its potential to combat age-related diseases, neurodegeneration, and to support human longevity 1 -4

In another study of 108 healthy subjects, they found that supplementing with lysine and arginine significantly reduced overall anxiety in both men and women, as well as decreasing biological anxiety markers such as salivary cortisol (male subjects only)

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112 Pt 1 137146 (1999)

Functional diversity of cysteine residues in proteins and unique features of catalytic redox-active cysteines in thiol oxidoreductases