While necessary for structural purposes, these strong linkages between cysteine residues render keratin indigestible to humans and thus unavailable for absorption
[Ref] Hematologic Very common (10% or more): Anemia (12%) [Ref] There have been reports from clinical trials of significant increases in platelet aggregation associated with high doses of levocarnitine (3 g/day) given to hemodialysis patients
NAC also helps indirectly by boosting your natural glutathione stores, but for targeted skin lightening, glutathione is often the go-to
Glutathione reductase (GR), an NADPH-dependent enzyme, continuously regenerates reduced glutathione (GSH) from its oxidized form (GSSG), thereby maintaining the intracellular reducing environment required for effective antioxidant defense, proper enzymatic activity, and redox-dependent signaling pathways [36]
Glutathione is naturally produced by the body, but levels can be depleted due to stress, poor diet, and environmental factors such as pollution