LipoCap™ Glutathione

Most people come to glutathione already keen on it. These are the questions our naturopaths ask in store, mostly about what's been shown, how long it takes, and who shouldn't take it at all.

A good fit if

• You're an adult interested in its antioxidant role, which is what the evidence best supports
• You can give it months rather than weeks. The trial that raised body stores ran for six
• You'd rather buy the plain form the trials used than pay for an absorption story
• You're comfortable that this isn't an ingredient you'll feel working

Check with us first if

• You're having chemotherapy, or about to. Talk to your oncology team first, not us. A 2024 study found cancer came back more often in people given oral glutathione during chemotherapy, and more often again with longer use. It looked back at past records, so it shows a link rather than proof, but it's not one to take a chance on.
• You're sensitive to sulfites. The breathing problems seen when glutathione was inhaled through a nebuliser were caused by sulfites forming.
• You take prescription medicine. The evidence we've reviewed doesn't cover drug interactions, so your pharmacist should know.
• You've had raised liver enzymes. Two people in a 12-week trial had temporary rises that settled when they stopped.
• If you take prescription medicines, check with your doctor, pharmacist or our naturopaths before you start.

• Reduced glutathione (GSH). Best known for: The plain powder in a capsule, and the form nearly every trial used. 'Reduced' is its working state, not a special process. Absorption: Weakest in short-term tests: a single 3 g dose raised nothing measurable, and 1,000 mg daily for four weeks changed nothing. Over six months it raised body stores by 30–35 per cent. Typical use: 250–500 mg a day, the range the trials used. The standard form, and the one to buy if you want what was tested.
• Liposomal glutathione. Best known for: The same molecule wrapped in tiny fat bubbles (phospholipid vesicles), meant to protect it from the gut enzyme that breaks it down. Usually a liquid. Absorption: One 12-person open-label study, funded by the maker, put whole blood levels up 40 per cent at two weeks. In the one randomised head-to-head trial, the formulation that beat plain glutathione 2.49-fold was micellar, not liposomal. Typical use: 500–1,000 mg a day in that study. No trial has tested whether it does better than the plain form on any health outcome.
• S-acetyl-L-glutathione (SAG). Best known for: Glutathione with an acetyl group on the sulfur atom, meant to survive the gut and be released inside the cell. Absorption: One single-dose study in 18 people. Blood plasma levels were higher than with plain glutathione, but red blood cell glutathione was higher after the plain form, and red cells are what matters. Typical use: That study used 3.494 g in one dose, seven to fourteen times an Australian capsule. There are no outcome trials, and it has no Schedule 1 entry.
• Oxidised glutathione (GSSG). Best known for: The used-up state of the molecule, occasionally seen on imported labels. Absorption: Tested against the reduced form at 250 mg daily for 12 weeks. Neither did better than placebo. Typical use: Not one to go looking for. GSSG has no Schedule 1 entry, so it can't be an active in an Australian listed medicine.

Reference values. There isn't one. Glutathione isn't an essential nutrient, because your body makes its own, so the NHMRC has no recommended intake and no deficiency for it.

Typical supplemental range. Australian labels usually suggest 250–500 mg a day. A common one reads 250 mg per capsule, one to two a day, or as professionally prescribed. Helpfully, that's the range the research used too: 250, 300, 500 and 1,000 mg across the trials we reviewed. Only S-acetyl glutathione is different, at 3.5 g in a single dose.

Upper level. No upper limit has been set. Item 2379 on Australia's permitted ingredients list (Schedule 1) sets no daily maximum, and there's no NHMRC upper limit because there's no recommended intake at all. The highest doses on record are 1,000 mg a day for six months and a single 3.5 g dose, neither with serious side effects. No limit isn't the same as proven safe.

Worth knowing. This isn't a quick-acting ingredient, so be wary of anyone who says you'll feel it within a week. The trial that raised the body's stores ran for six months, and levels drifted back towards where they started over a month after stopping. What you need depends on your age, diet and health, so talk to one of our naturopaths.

Food first, where the diet allows it.

• Asparagus and avocado: named as glutathione-containing plant foods; no verified per-serve figure exists
• Spinach and other green leafy vegetables: named, not quantified
• Cucumber and green beans: named, not quantified
• Protein foods, as the raw materials: glutamic acid, cysteine and glycine: your body builds its own glutathione from these, so no direct figure applies

If any of these sound like you, talk to one of our naturopaths or your doctor before you start.

• You're pregnant or breastfeeding. Item 2379 requires the label warning: not recommended for use by pregnant and lactating women.
• Children and teenagers. Item 2379 requires 'Adults only', and there's no dose or safety data for children.
• You're having chemotherapy. A 2024 look-back study of 366 breast cancer patients found recurrence of 31.8 per cent with glutathione by mouth against 22.2 without, and 46.8 with 16+ days' use. That's an association, not proof. Talk to your oncology team.
• You're considering injected, intravenous or 'drip' glutathione. That route isn't allowed for an Australian listed medicine.
• You'd be inhaling it or using a nebuliser. Lung function (FEV1) fell 19 per cent in mild asthma, apparently because sulfites formed.
• You're sensitive to sulfites. See a practitioner before starting.
• You've had raised liver enzymes. Two people in a 12-week trial had short-lived rises that returned to normal when they stopped.
• You take prescription medicine. The evidence here doesn't cover drug interactions.
• Minor effects in trials taken by mouth: nausea, itching, rash, acne (blackheads and whiteheads), upper stomach pain. 9 per cent had them, against 8 on placebo.
• There's no established upper level of intake. Having no cap isn't evidence that high doses are safe.
• If you take prescription medicines, check with your doctor, pharmacist or our naturopaths before starting.