Glutathione
Also called GSH, reduced glutathione
Glutathione is your body's master antioxidant - a small molecule that lives inside nearly every cell and spends its day mopping up the "rust" of everyday metabolism.
Studied in people, in small numbers. The ranges below lean mostly on community-reported dosing and results — what people run, and what they say happened.
- Immune
- Longevity & anti-aging
- Skin & hair
The quick answer
Glutathione is your body's master antioxidant - a small molecule that lives inside nearly every cell and spends its day mopping up the "rust" of everyday metabolism. It also gives your liver a hand with detox, which is why it's a favourite for people who want to feel clearer and look brighter.
The effects tend to be quiet rather than dramatic: a general sense of energy and clarity over the first few weeks, with skin brightening and evening out more gradually. One practical thing to know - once it's mixed, glutathione doesn't keep as well as most peptides, so use it within a couple of weeks and keep it cold and out of the light.
Why people use it
✨ Brighter, more even skin; 🛡️ Master antioxidant protection; 🧪 Supports liver detox; 🔄 Less oxidative stress; 💪 Immune support
What people report using
These are ranges other people have reported running. They are here so you can see what has actually been done — they are not medical advice and not a recommendation for you.
- How often
- 3× a week, morning
- Route
- subcutaneous
- Evidence for this
- Small human studies
Brighter skin and a general sense of clearing out.
- How often
- 3× a week, morning
- Route
- subcutaneous
- Evidence for this
- Small human studies
Brighter skin and a general sense of clearing out.
- How often
- 3× a week, morning
- Route
- subcutaneous
- Evidence for this
- Small human studies
Brighter skin and a general sense of clearing out.
1500mg vial + 7.5ml BAC water = 200mg/ml. 100-200mg = 50-100u. Daily or three times a week.
Work out your own units on the reconstitution calculator — the most common serious mistake in this area is arithmetic, not chemistry.
What to expect, and when
- First thing people notice
- Days 1–3 (energy, clarity)
- When it gets real
- Weeks 1–2 (skin brightness)
- Where it peaks
- Weeks 4–8 (full antioxidant baseline)
- Patience needed
- Low - felt quickly
- Days 1–3Perceived energy and clarity
Glutathione is the body's principal intracellular antioxidant, and users often report a quick sense of energy and mental clarity, plausibly tied to reduced oxidative load. These very early sensations are subjective and can reflect expectation as much as biochemistry. Oral absorption varies considerably between individuals and formulations.
- Weeks 1–2Early skin brightness
Glutathione is studied for its effect on melanogenesis, where it is thought to shift pigment toward lighter eumelanin and inhibit tyrosinase. In controlled oral studies, measurable changes in melanin index and UV spots have begun to appear around week 4, so the first weeks are early and subtle. Research suggests any brightening is gradual, not dramatic.
- Around week 4Visible tone and spot changes
By roughly four weeks, randomized trials of oral glutathione have shown significant reductions in melanin index and facial dark-spot size versus placebo. This is where cosmetic effects tend to become noticeable rather than merely felt. Evidence is stronger for oral and topical routes than for IV, which carries real safety concerns.
- Weeks 4–8Full antioxidant baseline
Skin-tone and antioxidant effects continue building through weeks 8–12 in trials, with brightening and some elasticity changes most evident by then. Honestly, results are variable across studies and commonly regress once supplementation stops, so a maintained baseline requires continued use. Large, long-term trials to confirm optimal dosing are still lacking.
Skin-lightening evidence is real but variable and route-dependent; effects commonly fade after stopping, and IV glutathione in particular carries serious safety concerns including anaphylaxis and hepatotoxicity.
Side effects, and what people do about them
About as gentle as it gets - it's a molecule your body already makes. Injected, expect a little sting at the site. One thing worth knowing: at sustained high doses it can lighten skin tone (that's actually the effect some people are after). Easy to manage by keeping to normal doses.
Go deeper
Open these only if you want them.
How it actually works
A tripeptide - glutamate, cysteine, glycine - and the body's principal intracellular antioxidant. It is not receptor-mediated at all, which puts it in a different category from most of what sits alongside it here. It reduces reactive oxygen species directly and as the substrate for glutathione peroxidase, and it inhibits tyrosinase, the rate-limiting enzyme in melanin synthesis, which is the route behind the skin-brightening reports.
For stacking, there is no receptor to compete for. The interaction that does matter is with vitamin C, which regenerates oxidised glutathione back to its active form - a genuine chemical reason the two are paired, rather than a habit.
What people report, in full
Glutathione's reputation is mostly cosmetic - a brighter, clearer, more even complexion - and it's especially popular in some markets for exactly that. About half to sixty percent report noticeable skin clarity and a clean, less-oxidised feeling. It's worth knowing where that reporting comes from: most of it is clinic IV infusions, and most of the controlled study work is on oral and topical glutathione. The under-the-skin route has not been put through the same studies, so regard those community numbers as reported experience from a different route rather than a measured result for this one. The one thing every source agrees on is that levels don't hold for long, which is why a regular rhythm matters more here than any single dose.
Sources and review
https://pubmed.ncbi.nlm.nih.gov/19230029/
https://pubmed.ncbi.nlm.nih.gov/21875351/
https://pubmed.ncbi.nlm.nih.gov/20524875/
Last reviewed 2026-09-06.
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