For skin brightening, this is not really a high-dose glutathione product.
The label shows L-glutathione 40 mg per 2 capsules, so your one-capsule daily dose is only about 20 mg glutathione. Studies that found possible skin-lightening effects generally used 250 to 500 mg per day, usually for a limited period. So I would not expect a noticeable brightening result from one capsule of this product.
It is mainly a multivitamin with iron and many small-dose extracts, rather than a dedicated, evidence-based treatment for pigmentation.
What research suggests:
- Oral glutathione may produce modest, inconsistent lightening, often more noticeable in sun-exposed areas.
- Results may fade after stopping.
- Evidence is limited by small studies and variable quality, so it is not a reliable way to substantially change natural skin colour. A 2025 systematic review found moderate but variable effects, while an earlier systematic review considered the evidence inconclusive.
If your concern is tanning, dark spots, acne marks, or melasma, the most effective basic step is daily broad-spectrum SPF 30-50 sunscreen, including indoors near windows and reapplying during outdoor exposure. For actual uneven pigmentation, a dermatologist can recommend evidence-based options such as azelaic acid, vitamin C, retinoids, or other targeted treatments depending on your skin type and cause.
Do not use IV glutathione injections for whitening. They have uncertain benefit and potentially serious risks.
Taking one capsule daily is unlikely to be harmful for most healthy adults, but it is probably not worth continuing specifically for glutathione-based brightening, especially because it still gives you iron.