Ergothioneine vs NAC
A side-by-side research comparison of Ergothioneine and NAC across mechanism, dosing, half-life, benefits, side effects and research status.
Comparison table
| Attribute | Ergothioneine | NAC |
|---|---|---|
| Full name | L-Ergothioneine | N-Acetyl Cysteine |
| Category | Detox & Antioxidant | Detox & Antioxidant |
| Status | OTC supplement | Dietary supplement / FDA-approved (Mucomyst) |
| Mechanism | Accumulates via the OCTN1 transporter in mitochondria and other high-stress cellular compartments, where it scavenges reactive oxygen species, chelates metals, protects DNA and mitochondria, and preserves other antioxidants. | Provides cysteine for glutathione synthesis (rate-limiting step). Directly scavenges free radicals via sulfhydryl group. Chelates mercury, lead, and arsenic. Modulates glutamate via system Xc- transporter for neuropsychiatric effects. |
| Molecular weight | 229.30 Da | 163.19 Da |
| Half-life | Very long (weeks; retained in tissue) | ~5.6 hours |
| Bioavailability | Good oral via OCTN1 transporter | ~6-10% oral (poor but effective due to GSH replenishment) |
| Typical dose | 5-25 mg per day | 600-1800 mg |
| Frequency | Once daily | 1-2x daily |
| Route | Oral capsule | Oral capsule or IV (hospital) |
Ergothioneine reported benefits
- Potent cellular and mitochondrial antioxidant
- Long tissue retention
- DNA and lipid protection
- Neuroprotective potential
- Associated with lower age-related disease risk
- Anti-inflammatory
NAC reported benefits
- Glutathione replenishment
- Liver protection (acetaminophen, alcohol)
- Heavy metal chelation
- Mucus thinning (respiratory)
- OCD/addiction support
- Anti-inflammatory
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Research and educational reference only. Not medical advice.