Amino Acid
This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer
L-Glutathione is the body's master antioxidant, essential for detoxification and immune function. Liposomal and S-acetyl forms have improved oral bioavailability compared to standard reduced glutathione. At 250-1000 mg/day, it supports liver health, skin brightening, and immune defense.
Glutathione is the body's principal antioxidant, but oral supplementation was long considered ineffective due to GI degradation. A 2015 RCT by Richie et al. (n=54) demonstrated that oral GSH at 250-1000 mg/day for 6 months increased blood glutathione levels by 30-35%. Liposomal and S-acetyl forms further improve bioavailability. NAC remains a cost-effective alternative that boosts endogenous GSH production.
Glutathione is the body's principal antioxidant, but oral supplementation was long considered ineffective due to GI degradation.
| Form | Bioavailability | Best For |
|---|---|---|
| Liposomal Glutathione | High | Best oral bioavailability; phospholipid encapsulation protects from GI degradation |
| S-Acetyl Glutathione | Moderate-High | Stable acetylated form that resists GI breakdown; good oral option |
| Reduced Glutathione (GSH) | Low-Moderate | Most affordable but lower oral absorption due to GI degradation |
| N-Acetyl Cysteine (precursor) | High | Boosts endogenous glutathione production rather than direct supplementation |
General recommendation: 250-1000 mg daily of liposomal or S-acetyl glutathione
Timing: On an empty stomach for best absorption; morning or split AM/PM
| Condition | Recommended Dose | Evidence |
|---|---|---|
| General antioxidant support | 250-500 mg daily (liposomal) | Moderate |
| Liver and detox support | 500-1000 mg daily | Moderate |
| Skin brightening | 500 mg daily for 4+ weeks | Moderate |
| Immune support | 500-1000 mg daily | Moderate |
Upper limit: 1500 mg/day used in clinical studies without significant adverse effects
Safety profile: Generally Safe
Both approaches work. A 2015 RCT showed oral glutathione at 250-1000 mg/day increased blood levels by 30-35%. However, liposomal or S-acetyl forms are recommended for better absorption. NAC (N-acetyl cysteine) at 600-1200 mg/day boosts your body's own glutathione production and is more affordable. For maximum effect, some practitioners combine both.
Multiple RCTs show oral glutathione at 500 mg/day can reduce melanin index and brighten skin tone over 4-12 weeks. It works by inhibiting tyrosinase and shifting melanin production from darker eumelanin to lighter pheomelanin. Results vary by individual, and effects are temporary — they reverse when supplementation stops.
Liposomal glutathione has the best oral bioavailability because the phospholipid coating protects it from degradation in the GI tract. S-Acetyl glutathione is another good option, offering stability and decent absorption. Standard reduced glutathione (GSH) is the cheapest but has lower bioavailability. IV glutathione has the highest bioavailability but requires clinical administration.