The study and its comparison
Fifty-four nonsmoking adults were randomized to oral glutathione at 250 or 1,000 mg daily or placebo for six months. Researchers sampled blood compartments and cheek cells; immune tests involved a subset. [1][2][3]
Reported glutathione increases varied by dose, time and compartment and generally returned toward baseline after washout. An immune-cell laboratory measure also increased in one comparison. [1][2][3]
What the finding establishes
Concentrations and laboratory activity are not infection rates or clinical recovery. The trial does not compare liposomal products or patches. Linked commentary and an author response concern interpretation of cited glutathione work; they are not retraction notices. Funding and conflicts were not established from the abstract. [1][2][3]
A hypothetical distinction
Imagine a blood antioxidant pool increases. That observation alone does not show fewer illnesses.
| Detail | Interpretation |
|---|---|
| Measured outcome | Keep the endpoint specific |
| Study preparation | Not every retail product |
| Remaining uncertainty | Not resolved by a mechanism |
Sources for this article
- Randomized controlled trial of oral glutathione supplementation on body stores of glutathione.
Source consulted: 2026-09-19. This is a reference resource, not a claim that we conducted the studies or tested a product. - Commentary to "Randomized controlled trial of oral glutathione supplementation on body stores of glutathione".
Source consulted: 2026-09-19. This is a reference resource, not a claim that we conducted the studies or tested a product. - Response to Letter to the Editor from Dr. Guilford.
Source consulted: 2026-09-19. This is a reference resource, not a claim that we conducted the studies or tested a product.