Gamma-Glutamylcysteine
Evidence: LimitedUseful mainly for people specifically aiming to raise blood/cellular glutathione.
Quick decision guide
May help most
People specifically aiming to raise blood/cellular glutathione
Common dosing range
100–400 mg/day; ~200 mg common
When to expect effects
Hours to days for glutathione rise; clinical effects unproven
Watch out for
Evidence is biomarker-level — raising glutathione has not been shown to improve health outcomes
What is it
Gamma-glutamylcysteine (GGC) is the immediate dipeptide precursor of glutathione, the body's main intracellular antioxidant. It is sold to raise glutathione levels, bypassing the rate-limiting synthesis step that normally controls glutathione production.
Is it worth it for you?
Use this as a quick fit check, not a diagnosis.
Worth considering if…
Probably skip if…
Evidence at a glance
| Goal | Evidence | Effect | Best fit | Time |
|---|---|---|---|---|
| raising glutathione levels | Limited Evidence | Measurable rise in blood glutathione | Adults wanting to increase glutathione status | Hours to days |
Evidence for 1 use
AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.
raising glutathione levels
Biomarker supportSmall human studies indicate that oral gamma-glutamylcysteine can raise blood (lymphocyte) glutathione concentrations, consistent with its role as the direct precursor. This is a biomarker change only; no trials show that the resulting rise translates into improved immunity, disease prevention, or other clinical endpoints.
Bottom line: GGC can raise glutathione levels, but a higher glutathione reading is not itself a proven health benefit.
How to take it
- Typical dose
- 100–400 mg/day, with ~200 mg a common choice
- Timing
- Any time of day
- With food
- Either; no clear food requirement
- How long to try
- A few weeks is enough to see whether a glutathione marker moves, if measured
What to track
- Blood glutathione if you can measure it
- GI tolerability
Safety
Common side effects
Generally well tolerated in short studies, Occasional mild GI upset
Who should avoid it
- People wanting a treatment with proven clinical efficacy
Pregnancy & breastfeeding
No safety data; avoid unless advised by a clinician.
Choosing a product
Look for
- States gamma-glutamylcysteine content per dose
- Third-party tested for identity and purity
Be skeptical of
- “Detoxifies the body”
- “Boosts immunity”
- “Master antioxidant cure”
References by claim
Track Gamma-Glutamylcysteine with Pilora
Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.
Coming to App StoreDisclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.