Is oral glutathione safe for the kidneys? Human studies provide some short-term safety information, but the evidence is not large or long enough to guarantee safety for everyone—especially people with chronic kidney disease.
What do human studies show?
Some oral glutathione studies monitored creatinine and blood urea nitrogen. A 2026 EFSA assessment reported no adverse changes in renal markers in the studies that measured them. These findings are limited by small study populations, varied doses and follow-up periods. They do not prove that every formulation is safe in chronic kidney disease or that rare and long-term risks are absent.
Does glutathione protect the kidneys?
Glutathione has antioxidant functions inside cells, and researchers study these pathways in kidney biology. That is not proof that taking a supplement prevents kidney damage, improves eGFR or treats chronic kidney disease. Do not use it as a kidney-protection treatment.
What do creatinine and eGFR mean?
Creatinine is a waste product from normal muscle metabolism. eGFR is an estimate of kidney filtration calculated using blood creatinine and other factors. Results should be interpreted with prior tests, urine albumin, medicines, hydration, muscle mass and recent exercise.
Who should consult a clinician first?
Anyone with chronic kidney disease, reduced eGFR, protein in urine, a kidney transplant, dialysis, recurrent stones or multiple medicines should show the exact supplement label to their nephrologist or treating clinician before use.
Frequently asked questions
Does glutathione increase creatinine?
Current limited human data do not establish that oral glutathione increases creatinine, but they cannot prove zero risk for every person.
Can it lower creatinine?
It is not an established treatment for high creatinine or reduced kidney function.
Should people with CKD take it?
There is insufficient evidence for a blanket recommendation. Ask your nephrologist to review the full formula and your kidney results.
Sources
Educational information only; not a kidney treatment recommendation.
