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NAC is a derivative of the common amino acid, cysteine, and is found naturally in onions
355 Clinical evidence supports their safety and efficacy
Most are not FDA-approved for human use, some exist only through a prescription or compounding pharmacy tied to a different condition, and the rest are sold exclusively as unregulated "research chemicals" not intended for human consumption
Lower variability in drug exposure facilitates more predictable dose-response relationships and simplifies dose selection in clinical practice
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