How long does Glutathione stay in your system?
Glutathione has a published half-life of 14.1 ± 9.2 minutes. By the standard pharmacology rule of thumb, a drug is about 97% eliminated after roughly five half-lives, which here works out to about 70.5 minutes. The standard deviation of 9.2 minutes is large, so individual values varied widely.
Source: Aebi et al., Eur J Clin Invest 1991 (PMID 1907548) · Peer-reviewed · measured: intravenous infusion · dataset reviewed September 23, 2026
What is the half-life of Glutathione?
Glutathione's published plasma half-life after intravenous infusion is 14.1 ± 9.2 minutes, from a 1991 study in the European Journal of Clinical Investigation in ten healthy volunteers. Glutathione is a tripeptide of glutamate, cysteine and glycine, and it is the body's principal intracellular antioxidant.
The standard deviation is almost two thirds of the mean, and that spread is part of the finding. Some volunteers cleared infused glutathione much faster than others. By the five half-life rule the mean gives about 70.5 minutes, but with a spread that wide, real individuals could sit well either side of it.
How much Glutathione is left after each half-life?
Each half-life removes half of whatever is left, so the percentages are pure arithmetic and the same for any compound; only the clock changes. For Glutathione, one half-life is 14.1 minutes. The rows below run that forward for a single amount with nothing added.
| Half-lives elapsed | Time elapsed | Remaining | Cleared |
|---|---|---|---|
| 1 | 14.1 minutes | 50% | 50% |
| 2 | 28.2 minutes | 25% | 75% |
| 3 | 42.3 minutes | 12.5% | 87.5% |
| 4 | 56.4 minutes | 6.25% | 93.75% |
| 5 | 70.5 minutes | 3.13% | 96.88% |
| 6 | 84.6 minutes | 1.56% | 98.44% |
| 7 | 1.65 hours | 0.78% | 99.22% |
Why do the numbers differ between sources?
Glutathione is sold in oral, inhaled, topical and injectable forms, and a half-life for one route says little about another. Oral bioavailability is low because glutathione is broken down in the gut, so for oral products the main question is how much reaches the blood at all, not how fast it then leaves.
Every cell makes glutathione and plasma already contains it, so an infusion study is really measuring how quickly an added amount returns to the body's own baseline. Figures that do not say which route and which baseline they describe are hard to interpret.
What does a half-life not tell you?
For a molecule the body makes continuously, 'out of your system' has no clear meaning. Plasma glutathione returns toward baseline a little over an hour after an infusion on the five half-life arithmetic, but the pool inside cells, where glutathione does most of its work, is a separate compartment this figure does not describe.
It also says nothing about the skin-lightening claims attached to injectable glutathione. The FDA and other regulators have warned against injectable whitening products, and the evidence for that use is limited and short-term.
Can you run the numbers yourself?
The estimator applies the same decay arithmetic to any half-life, starting amount and time you enter. It opens with Glutathione's published value loaded. Type another figure to see how sensitive the result is to it.
Published value: 14.1 ± 9.2 minutes (Intravenous infusion) · Aebi et al., Eur J Clin Invest 1991 (PMID 1907548) · Compound profile
Show the math
What are the limits of this estimate?
Everything above is a single-compartment approximation: one pool of drug, falling by the same fraction in every interval. Real elimination varies with kidney and liver function, body composition, formulation and route, and a published figure describes only the route and the people it was measured in. Many compounds also show a fast distribution phase before the slower elimination the table describes.
A half-life is not a dosing schedule. Labelled intervals come from clinical trials that measured outcomes and tolerability, and nothing on this page suggests when to take, repeat or stop anything. Whether Glutathione is out of your system for drug-testing purposes is a different question again. Tests often look for metabolites rather than the parent compound, and the answer depends on the assay, its sensitivity and the sample type, none of which a plasma half-life captures.
FAQ.
Does oral glutathione have the same half-life?
This page's figure is for intravenous infusion only. Oral glutathione is largely broken down in the gut, so for oral products the bigger question is how much reaches the bloodstream at all. We have no sourced oral half-life to quote.
Why is the glutathione standard deviation so large?
The study reported 14.1 ± 9.2 minutes in ten healthy volunteers, meaning clearance of infused glutathione varied widely between people. With a spread that large, the mean is a rough guide rather than a prediction for any one person.
Is glutathione ever out of your system?
No. Every cell makes glutathione, and plasma always contains some. The half-life describes how quickly an infused amount declines toward that baseline.
For what the evidence on Glutathione actually shows, read the Glutathione profile. For approval and regulatory position, see is Glutathione legal. The half-life reference lists every sourced value side by side, including the compounds where a number circulates online with no reliable human data behind it.