L-Cysteine
The rate-limiting amino acid for glutathione synthesis (the body's primary antioxidant). A simpler precursor form to NAC, studied for oxidative stress reduction and detoxification pathways.
An ingredient with still-limited research
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Effects reported in research
Provides substrate for glutathione synthesis
May contribute to oxidative stress reduction
Structural component of keratin in nails, hair, and skin
Dosage & timing
- 500–1,500 mg/day.
- Dietary protein often provides sufficient amounts.
- NAC has stronger evidence for glutathione support.
Cautions
- •High doses may cause GI discomfort.
- •Contraindicated in cystinuria.
- •Excessive intake risks pro-oxidant effects.
- •Consult a doctor before use.
Supporting research
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