Glutathione
Your body's own main antioxidant, injected because pills mostly do not get in. Modest skin brightening, liver support, gentle.
What it is
Glutathione is the antioxidant your cells make to mop up damage and help the liver clear toxins. People inject it for a brighter, more even skin tone, for liver support after heavy drinking or medications, and for recovery. It is one of the gentlest things on this site, and also one where a healthy person may feel nothing at all.
Three groups inject glutathione. People after an even, lighter skin tone, which is where most of the human data and most of the demand comes from. People whose liver has taken a beating, from a heavy-drinking stretch, long NSAID or acetaminophen use, or a course of medication, who want to give it a hand. And athletes and people over 40 using it for recovery and 'detox', which is the vaguest reason and the one least likely to show a result.
Here is what you will and will not notice. For skin, the brightening is real but modest, takes 8 to 12 weeks of consistent dosing to show (so do not stop at week six for a scheduled break), and fades within a few months of stopping; it does not change your actual skin color so much as take the dullness and dark patches down a notch. For liver and recovery, there is nothing to feel. Some people report less of a hangover or a bit more energy in the first week; that is pleasant and not something the studies back. If you are healthy and eat reasonably, your own glutathione production is probably fine and a shot adds little.
The tiers are 200, 400 and 600 mg subQ or IM two or three times a week for 4 to 8 weeks or longer, with no need to cycle off: your body already makes glutathione, and nothing suggests it stops working or builds up, so breaks are optional. The practical things that matter: it needs a lot of water (a 600 mg vial takes the full 10 ml), it stings and can leave a sore spot, it breaks down fast once mixed so you use it within days and keep it cold and out of the light, and a 600 mg vial is barely one and a half standard doses, which is why people buy the 1200 or 1500 mg sizes. Pair it with vitamin C, which recycles used glutathione back to its active form. The common mistake is injecting it with a tiny volume of water, which hurts and clumps.
On evidence: animal 4, human 3, with limited approval. Glutathione's role as the main cellular antioxidant is textbook, and IV glutathione has been used in clinics for years. The skin trials are small but consistent in showing a mild lightening effect. The Parkinson's work started with an encouraging small open-label IV study in the 1990s that later controlled trials, at IV doses such as 1400 mg three times weekly, did not confirm. The honest read: a gentle, well-understood molecule with a modest cosmetic effect and a lot of overclaiming around 'detox'.
Not worth it if you want energy: NAD+ does that job better and you can feel it. Not worth it for skin texture, wrinkles or firmness: GHK-Cu does more for most people. Not worth it if you have asthma: inhaled glutathione is known to trigger wheezing in asthmatics, and injected use has not been studied for that risk. If you want to raise your own glutathione cheaply, oral NAC gives your body the building block and costs a fraction of the injectable. Glutathione earns its place for skin tone and for a liver that needs a hand, and for not much else.
What people use it for
Skin brightening
Some evidenceSmall human trials, mostly in Asia and mostly with daily oral doses around 250 to 500 mg (IV protocols vary), report a measurable lightening and more even tone after several weeks. The effect is modest, works by shifting pigment toward a lighter form, and reverses after you stop. This is the best-supported reason people use it.
Liver and antioxidant defense
Most evidenceGlutathione's job as the main antioxidant inside cells and in liver detoxification is settled biology, and depletion is why acetaminophen overdose is treated with NAC, a glutathione precursor. What is not settled is whether injecting it helps a liver that is not depleted. For a liver that has taken a beating it is a reasonable support; for a healthy one it is probably redundant.
Parkinson's and the brain
Early daysA small open-label IV study in the 1990s reported better symptoms in Parkinson's patients, which created a lot of interest. Later controlled trials, at IV doses such as 1400 mg three times a week, did not confirm it. Glutathione does not cross into the brain well, and the home subQ dose is nowhere near the infusion doses that were tested.
Recovery and exercise
Early daysOxidative stress rises with hard training, so the logic is there, and some small studies with oral or precursor forms show less muscle fatigue markers. Nothing solid shows injectable glutathione improves recovery or performance in trained people, and some athletes avoid blunting the oxidative signal that drives adaptation.
How it works
- Used for detox support, skin brightness, and general wellness
- A natural antioxidant your body already makes
- Generally very well tolerated
- Helpful as support; not a cure for any specific condition
How people use it
Safety, in brief
Things people sometimes notice
- Stinging during the injection and a sore spot afterward, especially with too little water
- A small bruise or lump at the site
- Mild nausea or stomach upset for a few hours in some people
- Gradual lightening of skin tone, which is the cosmetic goal and will also show on moles and freckles
The full picture — stop signs and who should talk to a doctor first — is on the dosing guide.
Sources
The labels and studies behind this page. Each link opens the original on PubMed, DailyMed or ClinicalTrials.gov.