Glutathione Dosage, Timing and Safety: Complete UK Guide
Glutathione dosing is simpler than the marketing suggests: the research range is 250-1000mg daily, 500mg is the standard, and stores build over months rather than days. Here is the complete UK guide to dose, timing, evaluation window and safety.
At a glance
- Standard daily dose: 500mg reduced GSH with food
- Research range: 250-1000mg daily
- Evaluation window: 8-12 weeks minimum; stores build over months
- Our pick at the standard dose: Futuro Labs Glutathione — 500mg, £22.99 / 30 days
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Standard daily dose: 500mg reduced glutathione
Across the oral supplementation literature, 250-1000mg daily is the studied range, and 500mg is the workhorse dose — large enough to register in the trials that measured rising glutathione stores, small enough to be affordable long term. That is the dose logic behind Futuro Labs Glutathione: one 500mg serving of reduced GSH per day, single-ingredient, at £22.99 for a 30-day supply (~77p per day). If you are starting from zero, start here; there is no evidence that opening at 1000mg accelerates anything.
Futuro Labs Glutathione
£22.99 for 30-day supply · 77p per day
Pros
- 500mg reduced glutathione (GSH) per serving — the active form
- UK manufactured under GMP certification
- Single-ingredient, vegan, no fillers
- Independently lab tested — microbiology and heavy metals
- ~77p per day vs £1.20-1.80/day for liposomal formats
Cons
- Capsule format — no liposomal delivery system
- Newer brand versus heritage names like Solgar
Available from: Amazon UK — £22.99
Timing and what to take it with
Take glutathione once daily with a meal. Research protocols have not shown a morning-versus-evening effect, and food reduces the mild digestive discomfort a minority of users report. Pairing with vitamin C is a reasonable, low-cost adjunct — the two participate in the same antioxidant recycling network — though it is optional. There is no need to cycle glutathione or separate it from other supplements. If you already take NAC, understand the overlap first: our glutathione vs NAC comparison covers when each makes sense.
How long to evaluate
This is where most people misjudge glutathione. The frequently cited six-month Kyowa Hakko trial found body stores rising progressively across three to six months of daily oral GSH — a build curve, not a switch. Set your expectation accordingly: commit to eight to twelve weeks minimum of consistent daily dosing before drawing any conclusion, and treat any brand promising a felt difference inside a week as a red flag. At Futuro Labs pricing, a proper twelve-week evaluation costs about £69; at liposomal pricing it costs £105-165, which is a second argument for starting with the reduced form.
Safety and contraindications
Oral glutathione has a clean tolerability record in trials up to 1000mg daily, with occasional mild bloating the main report. The sensible exclusions: pregnancy and breastfeeding (insufficient safety data — seek medical advice first), anyone on prescription medication or managing a diagnosed condition (GP or pharmacist first), and anyone using supplementation to self-treat symptoms — persistent fatigue, jaundice, unexplained skin changes or similar warrant NHS 111 or your GP, not a supplement. No health claims for glutathione are authorised in the UK or EU; this guide describes research context, not promised outcomes.
Frequently asked questions
How much glutathione should I take per day?
Published oral supplementation research has most commonly used 250-1000mg daily, with 500mg the most frequent single-product dose — which is why Futuro Labs Glutathione is formulated at 500mg per serving. Start at 500mg daily with food. There is no established benefit to exceeding 1000mg daily, and no authorised UK health claims at any dose.
When is the best time to take glutathione?
Consistency matters more than clock time. Research protocols have typically dosed once daily with a meal, which also minimises the mild digestive discomfort occasionally reported. If you take other supplements, glutathione does not need to be separated from them; some users pair it with vitamin C, which participates in the same antioxidant recycling network.
How long does glutathione take to work?
The best-known oral GSH trial measured body glutathione stores rising progressively over three to six months of daily use — not days. Treat glutathione as a long-horizon supplement: commit to at least eight to twelve weeks of consistent daily dosing before judging it, and be sceptical of any product promising a felt effect in the first week.
Can you take too much glutathione?
Doses up to 1000mg daily have been used in trials without serious adverse effects; occasional mild bloating or cramping is the main report. That said, more is not better — stores respond to consistency, not megadosing. Avoid supplementation during pregnancy or breastfeeding without medical advice, and speak to your GP or pharmacist first if you take prescription medication.
Ready to start at the standard dose?
Futuro Labs Glutathione — 500mg reduced GSH per serving, 30-day supply, UK made. £22.99.
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