The Endotoxin Case Study

Glutathione (injectable)

Also known as GSH

Summary coverage

At a glance

What it is: Injected for skin lightening with no trials, and a documented endotoxin incident.

Evidence: Practitioner experience onlyHow the tiers workPhilippine FDA Advisory No. 2019-182 states it plainly: injectable and intravenous glutathione for skin lightening has no published clinical trials evaluating it for that use, and no published guidelines for dosing regimen or duration. Why this tier

Half-life: About 14 minutes, when given into a vein; From Aebi et al., European Journal of Clinical Investigation, 1991
Routes: Intravenous, Intramuscular, Subcutaneous, Oral, Topical
Category: Skin, Support
FDA: Not nominated; As of 3 August 2026. What that means
WADA: We do not state a status
Amino acids: 3

Not schedulable in Claritide. Our sources publish no dosing figure for Glutathione (injectable), so there is nothing to build a schedule from.

Evidence

Why this tier

Philippine FDA Advisory No. 2019-182 states it plainly: injectable and intravenous glutathione for skin lightening has no published clinical trials evaluating it for that use, and no published guidelines for dosing regimen or duration. Reported risks include toxic effects on the liver, kidneys and nervous system, Stevens-Johnson syndrome, anaphylaxis, and hepatic and renal dysfunction. Separately, US FDA reported in February 2019 that seven patients who received a compounded L-glutathione injectable had adverse events within minutes of infusion, traced to bacterial endotoxin five times above the appropriate limit. Glutathione is used by intravenous, intramuscular, subcutaneous, oral and topical routes; none is evidenced for skin lightening.

Overview

What it is

Injectable and intravenous glutathione is sold for skin lightening. There are no published clinical trials evaluating it for that use, and no published guidelines for dosing regimen or duration. It is also the library’s best real-world illustration of why endotoxin limits exist: in February 2019 FDA reported seven patients who reacted within minutes to a compounded glutathione injectable containing five times the appropriate endotoxin limit.

Mechanism

How it works

Glutathione is the body’s principal intracellular antioxidant, a tripeptide of glutamate, cysteine and glycine that neutralises reactive oxygen species and supports phase II detoxification. The skin-lightening rationale is that it shifts melanin synthesis from darker eumelanin toward lighter phaeomelanin by inhibiting tyrosinase. That rationale is biochemically describable and it has never been tested against the outcome in a published clinical trial by the injectable route.

Dosing

Commonly researched ranges

These are figures reported in published literature and practitioner protocols: a commonly researched range, not a recommendation. Claritide does not tell you what to take.

Not established in available literature. Our sources describe Glutathione (injectable) without publishing a dosing figure, so Claritide does not print one.

Cycle guidance: Not established in available literature
Goals: Skin & hair

Legal standing

Where this sits with the FDA

Dated, sourced, and separate from whether it works. Removal from a warning list is not permission to compound.

Not nominatedas of 3 August 2026 · US

Injectable glutathione for skin lightening is not an approved use, and compounded glutathione injectables are not approved finished drug products. The Philippine FDA issued a formal advisory on unsafe use; the US FDA reported a contamination incident in compounded product.

Primary source

How it got here

1 February 2019
US FDA reported seven patients with adverse events within minutes of receiving a compounded L-glutathione injectable, traced to bacterial endotoxin five times above the appropriate limit.

Sport

WADA status

The 2026 Prohibited List entered force on 1 January 2026.

We do not state a status

Not named on the 2026 Prohibited List. We could not determine a classification and do not state one.

We looked and could not resolve it. This is not the same as "not prohibited". Treat it as unresolved and check with your federation before competing.

Reconstitution

Mixing recipes our sources document

Concentration (mg/mL) = vial mg ÷ diluent mL. On a U-100 barrel, 1 unit = 0.01 mL.

Not established in available literature. Use the calculator with the figures printed on your own vial.
Open the calculator

Expectations

Week by week

What our material describes people reporting. Individual responses vary widely.

Not established in available literature.

Tolerability

Side effects

Grouped by how often our sources report them. Percentages appear only where a published trial figure exists.

Rare

Infusion reactions from endotoxin contaminationFDA, February 2019: seven patients who received a compounded L-glutathione injectable experienced adverse events within minutes of infusion. The symptoms were nausea, vomiting, lightheadedness, chills, body aches and sneezing. The cause was traced to bacterial endotoxin at five times the appropriate limit.
Stevens-Johnson syndromeListed among the reported risks of injectable glutathione for skin lightening by the Philippine FDA. Stevens-Johnson syndrome is a severe, potentially fatal skin reaction.
AnaphylaxisReported by the Philippine FDA among the risks of unsafe use for skin lightening.
Hepatic and renal dysfunctionReported by the Philippine FDA, alongside toxic effects on the nervous system.

Safety

Contraindications and interactions

Do not use if

Not established in available literature.

Interactions

Not established in available literature.

Absence from this list does NOT mean safety. It means lack of research.

Handling

Storage and cost

Storage: Our sources publish no vial and diluent pairing or beyond-use window. The relevant handling fact for this compound is not storage but sourcing. See the endotoxin incident on this record.
Cost: Not established in available literature

Combinations

Stacks with

Only pairings our own material actually documents. Stacking is the least evidence-based part of this field.

NAD+ (injectable / IV)The Clinic Drip

Deep dive

Glutathione (injectable) in full

Limited coverage

Glutathione is the body's principal intracellular antioxidant, a tripeptide of glutamate, cysteine and glycine. Injected and infused, it is sold primarily for skin lightening.

The regulatory finding

Philippine FDA Advisory No. 2019-182 states it directly: injectable and intravenous glutathione for skin lightening has no published clinical trials evaluating it for that use, and no published guidelines for dosing regimen or duration.

Reported risks in that advisory: toxic effects on the liver, kidneys and nervous system; Stevens-Johnson syndrome; anaphylaxis; hepatic and renal dysfunction.

Why this record is a teaching case

In February 2019, US FDA reported seven patients who received a compounded L-glutathione injectable and experienced adverse events within minutes of infusion: nausea, vomiting, lightheadedness, chills, body aches, sneezing. The cause was traced to bacterial endotoxin at five times the appropriate limit.

That is the endotoxin limit our sourcing module teaches, under 0.5 EU per mg, happening to real people in the real world.

Endotoxin is worth understanding precisely, because it defeats the intuitions people bring to sterility. It is a fragment of the outer membrane of Gram-negative bacteria. It is not alive, so killing the bacteria does not remove it. It passes through a 0.22 micron sterile filter. It is heat-stable at autoclave temperatures. And it is invisible: a solution loaded with endotoxin looks exactly like a clean one.

Which means the only thing standing between a vial and a reaction like the one above is a certificate of analysis from a manufacturer who actually tested for it. Not clarity, not sterility claims, not price.

Glutathione is used by intravenous, intramuscular, subcutaneous, oral and topical routes. None of them is evidenced for skin lightening.

References

Sources

1
Philippine FDA Advisory No. 2019-182 · unsafe use of glutathione as a skin-lightening agent
Source

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