NOW Foods Glutathione 500 mg takes a different, defensible angle on the category. Instead of chasing absorption with an exotic delivery form, it surrounds a full 500 mg of plain reduced glutathione with two cofactors that support the same liver-and-detox job: alpha lipoic acid, which helps regenerate spent glutathione back to its active form, and milk thistle, the classic liver-support botanical. For the buyer who wants a coherent detox stack rather than glutathione alone — backed by NOW's genuinely strong in-house QC — it's a smart one-capsule option. The honest limits are why it sits mid-list. It's still plain reduced glutathione, so the cofactors don't solve the debated absorption problem (Witschi 1992, Allen 2011), and being multi-ingredient makes it harder to compare milligram-for-milligram against the single-ingredient picks. It's a 'consider' for the detox-stack concept, not an automatic buy if you just want clean glutathione. Here's the full breakdown.
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Read the complete Glutathione guide →Plain reduced glutathione — the most-debated oral absorption (Witschi 1992, Allen 2011) — and not a named branded source. The added ALA and milk thistle support glutathione's recycling and the liver, but they do NOT improve absorption of the glutathione itself, so on the form axis this sits with the plain capsules, not the liposomals.
A full 500 mg of glutathione, squarely in the 250-1000 mg/day Richie 2015 range, plus 100 mg milk thistle and 50 mg ALA. The glutathione dose is right; the cofactors are at supportive (not heroic) amounts. Solid on dose — the question is delivery and comparability, not quantity.
NOW runs ISO/IEC-accredited in-house analytical labs and is GMP quality-assured — among the strongest internal QC operations in the category — and the product is vegan, non-GMO, kosher. Held mid-pack because it's multi-ingredient (harder to compare mg-for-mg), the glutathione isn't a named branded source, and there's no third-party NSF/USP seal.
At ~$0.42 per capsule it's reasonable for a three-ingredient detox formula — you're getting glutathione plus two cofactors, so the per-cap cost buys more than a single-ingredient capsule. Not the cheapest glutathione per day, but fair value for the stack.
One vegan capsule delivers the whole glutathione + ALA + milk thistle stack — convenient versus buying three separate products, and easy to sustain. Loses only a touch because, as a fixed combination, you can't independently adjust the dose of any single component.
“500 mg glutathione plus milk thistle and alpha lipoic acid per capsule.”
The formula delivers reduced glutathione 500 mg with milk thistle extract 100 mg and alpha lipoic acid 50 mg as stated — a genuine three-ingredient liver/detox stack in one capsule.
“Alpha lipoic acid and milk thistle support detoxification and antioxidant defenses.”
Mechanistically reasonable: ALA helps regenerate oxidised glutathione and is itself an antioxidant, and milk thistle (silymarin) has a long history as a liver-support botanical. 'Partial' because these are supportive, mechanism-level roles rather than proof of a specific clinical detox outcome from this combination.
“Manufactured under NOW's ISO/IEC in-house labs and GMP standards.”
NOW genuinely operates ISO/IEC-accredited in-house analytical laboratories and is GMP quality-assured — a verifiable, above-average internal QC operation, and one of the strongest reasons to trust this particular bottle's contents.
“Enhances your body's glutathione levels.”
Not reliably from the oral glutathione itself: plain GSH showed negligible plasma availability (Witschi 1992) and no biomarker change over 4 weeks (Allen 2011); only Richie 2015 showed body stores rising, over 6 months. The ALA may support recycling, but 'enhances your glutathione levels' is unverified as a dependable effect of this product.
“Comprehensive antioxidant and liver support.”
The combination is coherent for liver/antioxidant SUPPORT — glutathione, a recycling cofactor, and a liver botanical is a sensible stack. 'Partial' because 'comprehensive support' is a reasonable framing of the formulation rather than a demonstrated clinical result, and the underlying glutathione absorption remains debated.
The two add-ins aren't random. Alpha lipoic acid genuinely helps regenerate oxidised glutathione back to its active reduced form, so it supports the recycling side of glutathione's job, and milk thistle is a long-established liver-support botanical that fits glutathione's phase-II detox role. Bundled with 500 mg of glutathione, that's a coherent liver/detox stack in a single capsule. For the buyer who'd otherwise consider buying glutathione, ALA, and milk thistle separately, this is a sensible, convenient consolidation.
The most important thing to understand is what the stack does and doesn't do. It supports glutathione's FUNCTION and recycling; it does not make the plain oral glutathione absorb better. The absorption debate (Witschi 1992 negative on plasma, Allen 2011 negative on biomarkers, Richie 2015 positive only over months) applies here just as it does to any plain capsule. So if your specific concern is 'does the glutathione get in,' a cofactor stack isn't the answer — a liposomal (#2, #3) or S-acetyl (#4) form is.
Given that no pick on this list carries a third-party NSF/USP seal, NOW's ISO/IEC-accredited in-house analytical labs and GMP assurance are a genuine differentiator — a more rigorous internal testing operation than most brands run, on a vegan, non-GMO, kosher product. If brand-level QC reputation matters to you, NOW is one of the strongest names here, and that pedigree is a real part of this pick's case even though the glutathione isn't a named branded source.
The flip side of the stack is that you can't reason about it the way you can a single-ingredient capsule. You get a fixed 500 mg glutathione / 100 mg milk thistle / 50 mg ALA combination, which is convenient but makes clean mg-for-mg glutathione comparisons harder and removes your ability to tune any one component. If you value knowing and controlling exactly what you take, a single-ingredient pick (Healthy Origins #1, Jarrow #5) is easier to work with; if you want the stack handled for you, this is the trade you're accepting.
NOW Foods Glutathione 500 mg is the pick for the buyer who wants a liver-and-detox-oriented stack rather than glutathione in isolation. The cofactor choices are genuinely sensible — alpha lipoic acid supports glutathione recycling, milk thistle supports the liver — and bundling them with a full 500 mg of glutathione, backed by NOW's strong in-house QC, makes for a coherent one-capsule option that's convenient versus buying three products separately. It sits at #6 as a 'consider' because of two honest limits. First, it's still plain reduced glutathione, so the cofactors don't address the debated oral absorption — if that's your concern, a liposomal (#2, #3) or S-acetyl (#4) form is the right answer, not a cofactor stack. Second, being multi-ingredient makes it harder to compare mg-for-mg with the single-ingredient picks and removes your ability to tune any one component. If you specifically want the liver/detox stack concept, this is a smart, well-made choice; if you just want clean glutathione, Healthy Origins (#1) or Jarrow (#5) are simpler, and NAC remains the cheaper route to raising glutathione status.
Check NOW Foods · Reduced glutathione 500 mg + milk thistle + alpha lipoic acid · 60 veg caps on AmazonThe clean single-ingredient alternative — named Setria glutathione at 500 mg, easy to compare mg-for-mg, lowest cost-per-day among named-source picks. Buy this if you want glutathione alone, not a stack.
See it on the list →The pick if absorption is your real concern — Setria in a liposomal complex with human evidence behind the form (Sinha 2018). A cofactor stack can't do what liposomal delivery does for absorption.
See it on the list →The cheapest plain glutathione per serving — 240 capsules at about a dime a day. Better if you want maximum glutathione for the money without the cofactors.
See it on the list →250-1000 mg/day oral glutathione raised body stores over 6 months — the repletion evidence behind this product's 500 mg glutathione dose, with the caveat that it works slowly.
A single 3 g oral dose didn't raise plasma glutathione — 'negligible' availability. The plain-form absorption caveat the added cofactors here do NOT resolve.
500 mg/day for 4 weeks moved no oxidative-stress biomarkers — the short-term null result that means even this stacked formula should be judged over months.
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