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Limited environmental serine and glycine confer brain metastasis sensitivity to PHGDH inhibition

Participants who test positive (estimated to be less than 3% of those tested) are invited to Houston for detailed in-person examinations, funded by the study

Each batch undergoes independent analytical testing to verify: Compound identity Assay accuracy Purity confirmation Microbial safety Endotoxin levels Heavy metal screening Full batch traceability All testing is performed by independent laboratories to ensure transparent verification and reproducible research material

Potential effects on reproductive health with chronic use are unstudied

The unregulated nature of cosmetic glutathione use makes provider selection particularly important for patient safety