Glutathione

What it is

Glutathione is a very small peptide, just three amino acids (glutamate, cysteine and glycine), found in every cell. It is one of the body's main antioxidants and helps the liver process toxins. Your body makes its own, and it is not an essential nutrient.

It is marketed as an anti-ageing, detox and skin-lightening injection. The skin-lightening claim is the most heavily promoted and the most worrying. Health regulators in several countries have warned against it.

Taken by mouth, standard glutathione is poorly absorbed, and any benefits seem modest. Injections and drips get it into the blood, but that does not mean they are safe or that they do what is claimed.

History

Glutathione was discovered in 1888 and its structure was worked out in the 1920s and 1930s. It has been studied for decades in liver disease and oxidative stress, and became a cosmetic injection fad, particularly in parts of Asia, from the 2000s.

How it works

Glutathione neutralises reactive molecules, supports the liver in clearing drugs and toxins, and helps recycle other antioxidants. In pigment cells (melanocytes), it is believed to shift melanin production from dark to lighter forms. That is the basis for the skin-lightening claim. It is mostly built from cysteine, so the body's own supply depends on cysteine intake.

Dosage

• There is no accepted dose for cosmetic use. Clinics commonly use 600-1,200 mg by IV push or drip, once or twice a week, but there is no medical standard and no long-term safety data for that.
• Studies of skin lightening used oral or lozenge forms at low doses (e.g. 250-500 mg daily) for a few weeks, with small effects in small trials.
• Larger or more frequent doses have not been shown to work better.
• Courses of many weeks are marketed. This is not backed by long-term safety evidence.

How it is taken

• Intramuscular injection is the usual self-administered route when it is bought as a vial. IV drips are given in clinics and carry their own infection and vein risks.
• Subcutaneous use is reported but injections can sting.
• Oral glutathione is poorly absorbed, although some studies show blood levels do rise after weeks of daily use. Liposomal and sublingual forms are claimed to be better absorbed.

How to reconstitute

• 600 mg vial: add 3 ml of bacteriostatic water to get 200 mg/ml. On a 1 ml syringe that is 2 mg per unit, so 100 mg is 50 units and 200 mg is 100 units (a full syringe).
• 1,500 mg vial: add 5 ml to get 300 mg/ml. That is 3 mg per unit, so 150 mg is 50 units and 300 mg is a full syringe. A lot of volume for IM, so large doses may need splitting across sites.
• Dissolve gently by swirling. The solution should look clear. Use quickly as glutathione oxidises.

How it should arrive

Sealed vial with a white to off-white powder or cake. A strong sulphur smell, yellowing, or clumping from moisture suggests degradation.

How it should look once reconstituted

Clear and colourless once dissolved. Yellow tinge, cloudiness or particles mean do not use. A faint sulphur smell can be normal; a strong one is not.

What to expect, and when

• Skin lightening claims: marketed as 4-12 weeks of regular use. Studies show small changes at best, and effects fade after stopping.
• Detox and energy claims: no reliable timeline or evidence.
• If you are using it for skin, the lack of change by 8-12 weeks is the realistic answer.

Side effects

• Injection-site pain, redness or bruising.
• Bloating, abdominal cramps, flushing, nausea.
• Sulphur smell or taste.
• Allergic reactions, including rash, and in rare cases anaphylaxis.
• Reports of low zinc levels with long-term high-dose use.

Risks

• The Philippine FDA issued a public warning in 2019 against injectable glutathione for skin whitening, citing the lack of evidence for safety and efficacy and the risk of serious reactions. Other health authorities and professional bodies have raised similar concerns.
• Reported problems linked to high-dose IV glutathione include serious skin reactions, liver and kidney problems, and infections from contaminated products. Not all of these have been conclusively linked to glutathione itself.
• Skin lightening carries ethical and health concerns, including pressure about skin tone, uneven results, and no protection from sun damage.
• Asthmatics should take care, especially with nebulised glutathione, as it can trigger bronchospasm.
• Unlicensed vials raise sterility and dose concerns, and IV use by non-medical providers raises them further.
• Not recommended in pregnancy or breastfeeding without medical advice.

Potential gains

• Small, short-term lightening of skin in a few small trials, mostly of oral or topical forms. Quality of evidence is low.
• Liver support in medical settings is done with N-acetylcysteine (the paracetamol-overdose antidote), which boosts the body's own glutathione. Glutathione itself is not the standard treatment.
• Healthy people with a good diet generally do not need extra, and raising glutathione in the blood has not been shown to improve health outcomes.

Other useful information

If you want to raise glutathione, N-acetylcysteine (NAC) and a diet with enough protein (cysteine) are cheaper and better-evidenced routes. If skin pigmentation is the concern, a dermatologist can offer tested treatments, with sun protection as the foundation.