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long-term studies show minor GI effects

N-Hcy-Lys has been originally identified in vitro as a product of facile reaction of Hcy-thiolactone and lysine 12,13,14

Glucose deprivation reduces the PPP-mediated NADPH generation, making it impossible to reduce insoluble cystine imported via xCT to a more soluble cysteine, thereby inducing disulfide stress (i.e., cystine-dependent toxicity) and leading to rapid cell death [48] [Figure 3B]

Eye Health / Retina Protection Nakagawa K, et al

High-dose oral therapy (typically 1,000 micrograms daily) relies partly on passive diffusion and can be effective even in many people with malabsorption issues, according to UK guidance