Because the availability of the amino acid cysteine is the primary rate-limiting bottleneck for natural glutathione production, flooding the system with NAC ensures the cellular assembly lines are fully stocked
(2020) 318:H1474h86
Why the escalation schedule exists Early clinical development tested faster escalation schedules
This means that even compliant ingredients can trigger enforcement if marketing language suggests unapproved uses or benefits and the way suppliers are selling peptides
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However, N-acetylcysteine (NAC), a glutathione precursor, has the strongest clinical evidence and is used in NHS hospitals, making it a more reliable option despite not being a direct glutathione supplement