What the studies show
Short-term oral use was tolerated in the trials, with non-serious adverse events reported. Long-term and injectable safety are not established.
“Some adverse events but nonserious were reported.”
A few small or poorly-controlled human studies. Enough to be interesting; not enough to count on. Most of what gets called “clinically proven” online lives here.
- 1Dilokthornsakul W, et al. The clinical effect of glutathione on skin color and other related skin conditions: a systematic review.J Cosmet Dermatol, 2019;18:728–7374 studies; conclusion inconclusive.
In context
Glutathione is a three-amino-acid molecule every cell makes and uses to handle oxidative stress. It is sold orally and, in some countries, intravenously for skin lightening. Systematic reviews of the small trials find it may brighten sun-exposed skin slightly, but call the evidence inconclusive because the studies are few, small and inconsistent. Oral absorption is itself questionable, and the intravenous use that carries the most risk has the least evidence — in 2026 the FDA linked at least 30 adverse events, some needing hospital care, to injectables compounded from supplement-grade glutathione contaminated with endotoxin.
Glutathione is supplement; injectable use unapproved. Legal status differs by country — see the regulation section or the jurisdiction pages.
Questions
Is Glutathione proven to cause safety?
What studies are behind the grade?
Is Glutathione approved for this?
Other outcomes for Glutathione
- CSkin lightening4 studies in systematic review (3 RCTs)
- COral bioavailabilityadverseReviews
- DIntravenous use for skinNo adequate controlled trial
- BEndotoxin reactions from compounded injectablesadverseFDA case series (≥30 patients); recalls
Written and maintained by LYO Research — how pages are written and checked. Reviewed 7 October 2026. Grades count human evidence only; see how LYO grades. Not medical advice. Correct this page →