Supplements
Glutathione supplements in the UK: do the capsules work?
Reviewed by a qualified clinician · analysed at UKAS-accredited UK labs (ISO 15189)
Last reviewed September 20266 min read
Every Helvy guide is written by our health editors, then checked by a qualified clinician before it goes live and re-checked as the science moves. We name clinical roles, not individuals, until each reviewer has agreed to be credited publicly. This is wellness guidance to help you understand your own data, not a diagnosis.
QUICK ANSWER
Oral glutathione capsules do raise the amount in your blood. A six-month trial found rises of about 30 to 35 percent. What no trial has shown is a health benefit you would notice. Glutathione drips are a separate issue: UK Trading Standards warned in June 2025 that cosmetic ones are unlicensed and unsafe.
Find the panel that reads your liver →As of September 2026. Glutathione is the most searched supplement on our watchlist this month. Most of that interest traces back to a Channel 4 News investigation into glutathione drips sold in UK salons, and the public warning that followed it.
Two very different products share one word. Capsules you swallow are a food supplement. Drips are an injectable medicine with no UK licence for cosmetic use. This guide covers both, then the cheaper thing worth doing before you buy either.
1. Do glutathione capsules actually work?
They raise the number. That is what has been shown, and it is worth being precise about the rest.
Glutathione is a small molecule your body builds for itself. It is made from three amino acids, and your liver makes more of it than any other organ. Its job is to mop up the reactive waste your cells throw off as they work. Hence the nickname you see on the label.
The strongest human evidence is a 2015 trial in the European Journal of Nutrition. Fifty-four non-smoking adults took 250 mg a day, 1,000 mg a day or a placebo, for six months. On the higher dose, glutathione in red blood cells, plasma and lymphocytes rose by 30 to 35 percent against baseline.
So it gets in. For years the working assumption was that your gut broke it all down before any of it reached you.
Now the catch. That trial measured glutathione. It did not measure whether anyone felt better, got ill less often or aged more slowly. A higher lab number is not a health outcome, and no supplement sold in the UK may claim to treat or prevent anything.
2. Why the drips are a different question entirely
This is the part worth reading twice.
Glutathione is sold in the UK as an intravenous drip for skin lightening and brightening. On 26 June 2025 the Chartered Trading Standards Institute issued a public warning about it. A Channel 4 News investigation had found over 300 beauty salons offering the procedure, many with no medical supervision at all.
Kerry Nicol, CTSI's External Affairs Manager, said these are “not harmless beauty treatments” but “medical-style procedures being administered with no clinical oversight, no regulation, and no accountability”.
The legal position is plain. Injectable glutathione holds no UK licence for skin lightening or for treating any illness, so supplying it for cosmetic use is unlawful. The Joint Council for Cosmetic Practitioners puts the evidence question just as plainly: “There is little clinical evidence to support any of these claims and little understanding of the risks.”
The reported harms in the CTSI warning include anaphylaxis needing hospital treatment, kidney strain and infection. If you have had a reaction after any procedure like this, you can report it through the MHRA Yellow Card scheme, and call NHS 111 if you need help now.
Helvy does not sell glutathione in any form. This section is here because the search results for the word mostly do not tell you any of the above.
3. What is worth checking before you spend anything?
Read the organ that makes it. That is the cheap first step almost nobody takes.
- ALT. An enzyme that lives inside liver cells and leaks into blood when those cells are under strain. It is the most useful single look at your liver, and our ALT guide covers how the number is read.
- ALP. Alkaline phosphatase, a second liver enzyme, this one tied to your bile ducts and to bone.
- Albumin and total protein.Albumin is the main protein your liver builds. A low result is one of the few signs the liver's manufacturing side is struggling, and glutathione comes off that same production line.
- CRP. C-reactive protein rises when something inflammatory is going on. Oxidative stress is what glutathione is sold for, and CRP is the nearest routine marker you can actually buy.
None of these measure glutathione. Nothing you can buy at home does. They read the organ that makes it, which is a smaller claim and a more useful one. Our liver function test guide walks through each marker in turn, and the energy and fatigue hub covers the other common reasons people go looking for an antioxidant in the first place.
Helvy's Thyroid & Vital Organs panel (£159) carries ALT, ALP, albumin and total protein, alongside thyroid, kidney and cholesterol markers, from a home finger-prick sample. CRP sits on the General Energy & Wellness panel (£149) with cortisol, vitamin D and vitamin B12.
A blood test measures biomarkers and offers wellness insight. It does not diagnose a condition. One reading outside its range does not on its own mean something is wrong, which is why a qualified clinician reads the whole set.
4. If you take it anyway, how would you know?
Decide what would count as working before you start. Otherwise the answer is whatever you paid for it.
- Get a baseline first. ALT, ALP, albumin and total protein now, not in hindsight three months from now.
- Pick one thing you can count. Morning energy out of ten beats a vague sense of improvement.
- Give it three months at least. The trial above ran for six.
- Change one thing at a time. A new supplement plus a new bedtime tells you nothing about either.
- Look at the rest of your shelf. Several herbal supplements are hard on the liver, and stacking them muddies the picture.
One more option is worth knowing about. NAC, or N-acetylcysteine, supplies cysteine, the amino acid your body tends to run short of when it builds glutathione. It has a far longer research history, and our NAC guide sets out what that does and does not mean.
READY TO TEST?
Start with the organ that makes it
ALT, ALP, albumin and total protein sit on one home finger-prick panel. CRP sits on another. The quiz will tell you which one fits your question. Results in around 5 working days from UKAS-accredited UK laboratories.
Frequently asked questions
Does oral glutathione get absorbed?
Some of it does. A six-month trial in the European Journal of Nutrition found glutathione in red blood cells, plasma and lymphocytes rose by 30 to 35 percent on 1,000 mg a day. That trial measured levels, not how anyone felt, so absorption and benefit are two separate questions.
Are glutathione IV drips legal in the UK?
Not for cosmetic use. Injectable glutathione holds no UK licence for skin lightening or for treating any illness, so supplying it that way is unlawful. Trading Standards issued a public warning in June 2025 after a Channel 4 News investigation found over 300 salons offering it.
Does glutathione lighten skin?
The Joint Council for Cosmetic Practitioners says there is little clinical evidence behind the cosmetic claims made for it, and little understanding of the risks. Reported harms from drips include anaphylaxis, kidney strain and infection. Helvy does not sell or endorse the treatment.
Is there a blood test for glutathione?
Not one you can buy as a home kit in the UK. Glutathione is measured in research settings, not in routine testing. What you can read at home is the liver that makes it, through ALT, ALP, albumin and total protein.
Is NAC the same as glutathione?
No. NAC supplies cysteine, one of the three amino acids your body uses to build glutathione. Think of it as the raw material rather than the finished product. It has a longer research history than oral glutathione itself.