Best Glutathione Supplements 2026: 6 Products Compared

Last updated: August 7, 2026 · Published by Eternal Elixir

Last updated: August 7, 2026 · By Eternal Elixir Editorial · 6 products compared

Glutathione is the body’s main internal antioxidant, and oral supplements come in two useful forms: plain reduced glutathione (GSH) and liposomal glutathione. Both raise blood glutathione in human trials. Liposomal works faster at lower doses; plain reduced costs far less per gram.

Key numbers:

• Doses used in published human trials: 250–1,000 mg per day of oral glutathione (Richie et al., European Journal of Nutrition, 2015).

• Whole-blood glutathione increase after 2 weeks on liposomal glutathione: 40% (Sinha et al., European Journal of Clinical Nutrition, 2018).

• Cost per gram of glutathione across the 6 products compared here: $0.30 to $22.56 — a 75-fold spread.

• Glutathione per serving across these products: 100 mg to 2,000 mg.

The Real Question With the Best Glutathione Supplements: Which Form Actually Raises Your Levels

You have probably already read that swallowing plain glutathione is pointless because your gut destroys it before it reaches your bloodstream. It is the single most repeated claim in this category, and it is repeated so confidently that most buying guides never check it.

It is also not quite what the research says.

The longest and largest placebo-controlled trial of oral glutathione ran for six months in 54 healthy non-smoking adults, using plain oral glutathione at 250 mg or 1,000 mg per day. Both doses raised body glutathione stores versus baseline, measured in whole blood, red blood cells, plasma and buccal cells. That study, published in the European Journal of Nutrition, is the strongest single piece of evidence in this category, and it did not use a liposomal product.

Liposomal glutathione has real evidence too, and it moves faster. A one-month pilot study in 12 healthy adults, published in the European Journal of Clinical Nutrition, found whole-blood glutathione rose about 40% within two weeks at 500–1,000 mg per day of liposomal glutathione, alongside reductions in oxidative stress markers. It is a much smaller and shorter study than the six-month trial, but it is genuine human data and it supports the absorption argument liposomal brands make.

So the honest summary is not “liposomal good, capsules useless.” It is this: liposomal delivery gets you there faster and at a lower milligram dose, and you pay a large premium per gram for that. Plain reduced glutathione needs a higher daily dose and more patience, and it costs a fraction as much. Which one is the best glutathione supplement genuinely depends on which of those two trade-offs you would rather make.

That is the axis this guide ranks on — not marketing language about “superior absorption,” but dose per serving, verified cost per gram, and what the human trials actually tested. If you are assembling a broader routine rather than buying one bottle, our guide to the best TUDCA supplements covers the other half of the liver and antioxidant conversation, and the NMN supplement comparison covers the cellular-energy side.

Best Glutathione Supplements Compared: Cost per Gram of Glutathione, Dose per Serving and US Shipping

Every row below is normalized the same way: cost per gram of glutathione, calculated from the published label dose and the US price checked in August 2026. This is the column almost no glutathione roundup publishes, and it is where the category gets uncomfortable — the spread between the cheapest and most expensive product here is roughly 75-fold for the same molecule.

Cost per gram = US price ÷ (servings per container × grams of glutathione per serving). Codeage is listed across several US retailers at different prices, so a single honest cost-per-gram figure cannot be published for it here.

1. Nutricost Glutathione — Best Overall

Nutricost Glutathione wins this comparison on the two things that are actually measurable: it matches the dose used in the strongest published trial, and it costs less per gram of glutathione than anything else here by a wide margin.

Key specs: 500 mg reduced glutathione per serving, 240 capsules per bottle, $35.95 at the time of checking (regular price $39.95). That works out to 120 grams of glutathione per bottle and roughly $0.30 per gram.

Pros:

• 500 mg per serving sits inside the 250–1,000 mg per day range used in the six-month placebo-controlled trial
• Lowest verified cost per gram in this comparison, by a factor of more than two
• 240 capsules is roughly an eight-month supply at one capsule daily
• Widely stocked across US retailers, so it is easy to reorder

Cons:

• Plain reduced glutathione with no absorption-enhancing delivery system
• Large bottle count means a longer commitment if it does not agree with you
• No branded or patented glutathione ingredient

Best for: anyone who wants the studied dose at the lowest defensible price and is willing to give it months rather than weeks.

2. Codeage Liposomal Glutathione — Best Liposomal Capsule

If you want liposomal delivery in a capsule rather than a liquid, Codeage Liposomal Glutathione is the most credentialed option in this group. It uses Setria, a branded reduced L-glutathione, paired with a sunflower-derived phospholipid complex, and the product carries NSF certification — a real third-party mark rather than a self-declared one.

Key specs: 500 mg Setria L-glutathione per serving plus 350 mg phospholipid complex, 60 capsules per bottle, 30 servings. Vegan and non-GMO.

Pros:

• NSF certification is one of the stronger independent quality marks in US supplements
• Branded Setria glutathione rather than a generic commodity input
• Liposomal delivery in capsule form, which avoids the taste problem liquids have
• Stocked at Amazon, GNC, Vitacost, Walmart and the Vitamin Shoppe

Cons:

• Price varies meaningfully between retailers, so cost per gram is not a fixed number
• 30 servings per bottle means monthly reordering
• You pay a clear premium over plain reduced glutathione for the delivery system

Best for: buyers who want liposomal absorption and third-party certification, and who care more about credentials than about cost per gram.

3. Eternal Elixir Reduced L-Glutathione 2000mg — Highest Dose per Serving

Eternal Elixir does not win this list on price, and it is not the most certified product here. What its Reduced L-Glutathione 2000mg does hold outright is the highest glutathione dose per serving of any capsule product compared — 2,000 mg, four times the Codeage and Nutricost serving and more than eleven times the Thorne one.

Key specs: 2,000 mg reduced L-glutathione per 2-capsule serving, 60 capsules per bottle, 30 label servings, $39.99. The formula is deliberately plain: reduced L-glutathione, rice flour and a cellulose capsule.

That works out to 60 grams of glutathione per bottle and $0.67 per gram — second-cheapest in this comparison.

There is a practical detail worth knowing, and it is the reason this product is more flexible than its label suggests. At 1,000 mg per capsule, a single capsule lands exactly on the upper dose used in the six-month trial. Taken that way, one bottle is a 60-day supply rather than a 30-day one, and the daily cost drops accordingly. Higher is not automatically better with glutathione — the published human trials ran at 250–1,000 mg per day, not 2,000 mg — so the ability to take half a serving and still hit a studied dose is genuinely useful.

Pros:

• Highest per-serving dose of any capsule product in this comparison at 2,000 mg
• Second-lowest cost per gram at $0.67, behind only Nutricost
• Splittable: one capsule delivers 1,000 mg, matching the trial’s upper dose
• Lab tested, GMP certified, and sold direct so there is a single published price
• Ships in 24 hours across the US, with free shipping over $100

Cons:

• Not liposomal — no absorption-enhancing delivery system
• 60 capsules per bottle is a shorter run than Nutricost’s 240
• 2,000 mg per serving exceeds the doses actually tested in published trials
• Smaller brand than Thorne or Nutricost, with a shorter review history in the US

Best for: people who want a high-dose, no-filler reduced glutathione from a brand that publishes one price, and who like being able to split the serving. It pairs naturally with a broader antioxidant routine — the same logic behind comparing NMN and resveratrol rather than treating either as a standalone answer.

4. Thorne Glutathione-SR — Best Sustained-Release Option

Thorne Glutathione-SR takes a different approach: a lower dose delivered slowly rather than a large dose delivered at once. Thorne is one of the most established practitioner-channel brands in the US and holds NSF Certified for Sport status, which matters if you are drug-tested.

Key specs: 175 mg reduced glutathione per capsule in a sustained-release matrix, 60 capsules, around $54.00 depending on retailer. That is 10.5 grams per bottle and roughly $5.14 per gram.

Pros:

• NSF Certified for Sport — the relevant certification for competitive athletes
• Sustained-release format spreads delivery rather than spiking it
• Long-standing practitioner-channel reputation and consistent manufacturing
• Gluten, dairy and soy free

Cons:

• $5.14 per gram — roughly 17 times Nutricost’s cost for the same molecule

• 175 mg per capsule sits below the 250 mg lower dose used in the trial
• Sustained-release benefit for glutathione specifically is a formulation rationale, not a proven outcome

Best for: drug-tested athletes and anyone already inside the practitioner-channel ecosystem who values the certification over the per-gram cost.

5. Quicksilver Scientific Liposomal Glutathione — Best Liquid for Dose Control

Quicksilver Scientific Liposomal Glutathione is a liquid, and that is its main advantage: you can dose in 1 mL increments rather than in fixed capsule steps. For people titrating up slowly — which is a reasonable approach with glutathione — that flexibility is worth something.

Key specs: 100 mg reduced glutathione per 1 mL serving with 84 mg phosphatidylcholine from purified sunflower lecithin, 50 servings per 1.7 fl oz bottle, $45.00. That is 5 grams per bottle and $9.00 per gram.

Pros:

• Liquid format allows precise, gradual dose adjustment
• Genuine liposomal preparation with a disclosed phospholipid content
• Available in lemon mint and cacao mint, which helps with a compound that tastes unpleasant neat

Cons:

• $9.00 per gram — 30 times Nutricost’s cost per gram
• 100 mg per serving means multiple servings to reach studied doses, which shortens the bottle fast
• Liquids need refrigeration after opening and travel less well than capsules

Best for: people who specifically want a liquid, want fine dose control, and accept the per-gram premium that comes with both.

6. Cymbiotika Liposomal Glutathione — Best for Added Cofactors

Cymbiotika Liposomal Glutathione is the most expensive product here per gram by a large margin, and its case rests on what comes alongside the glutathione rather than the glutathione itself: CoQ10, PQQ and vitamin B2 in a sunflower-lecithin liposomal base, delivered in single-serve pouches.

Key specs: 150 mg glutathione per 5 mL pouch with 20 mg phosphatidylcholine plus CoQ10 and PQQ, 26 packets, $88.00. That is 3.9 grams of glutathione per box and $22.56 per gram.

Pros:

• Single-serve pouches are genuinely convenient for travel
• Added CoQ10 and PQQ mean you are buying more than one ingredient
• Third-party tested, vegan and non-GMO

Cons:

• $22.56 per gram — roughly 75 times Nutricost’s cost for the glutathione component
• 150 mg per serving is well below the doses used in published glutathione trials
• If you do not want CoQ10 and PQQ, you are paying for ingredients you did not seek

Best for: buyers who want a convenience-first format with mitochondrial cofactors included and are not optimizing for cost per gram. If mitochondrial support is the actual goal, it is worth reading about what the research shows on methylene blue before assuming a glutathione product is the right tool for it.

What the Two Best Human Trials on Glutathione Actually Found

Most glutathione buying guides cite “studies” without telling you what was tested, in whom, or for how long. Two human trials carry most of the weight in this category, and they point in slightly different directions.

The six-month trial (plain oral glutathione). Research published in the European Journal of Nutrition reported a six-month randomized, double-blinded, placebo-controlled trial in 54 healthy non-smoking adults, testing plain oral glutathione at 250 mg or 1,000 mg per day. Glutathione levels in blood rose at 1, 3 and 6 months versus baseline at both doses.

This is the longest and largest controlled trial in the category, and it used exactly the kind of product the internet says does not work. You can read the record at PubMed, PMID 24791752.

The one-month pilot (liposomal glutathione). A pilot study published in the European Journal of Clinical Nutrition gave 12 healthy adults liposomal glutathione at 500 or 1,000 mg per day for one month. Whole-blood glutathione rose up to 40% by two weeks, with increases also seen in red blood cells, plasma and peripheral blood mononuclear cells, alongside reductions in oxidative stress markers.

The record is at PubMed, PMID 28853742. Note the scale: 12 people for one month is a pilot, not a definitive trial.

Read together, these studies suggest liposomal delivery reaches a given blood level faster and at a lower dose, while plain oral glutathione at an adequate dose gets there too over a longer horizon — and has the more robust study behind it. Neither study is a reason to expect a supplement to treat a medical condition. Both are reasons to think the molecule is absorbed in some usable amount, which is more than can be said for many popular ingredients.

This kind of evidence-grading is the same approach we take with newer longevity compounds, where the gap between marketing and published data tends to be widest — see the Ca-AKG evidence review for a worked example.

How We Evaluated These Glutathione Supplements

We did not test these products ourselves and we are not going to pretend otherwise. What follows is a documented comparison built from published label specifications, US retail prices checked in August 2026, third-party certifications that can be independently verified, and peer-reviewed human trials. Here is the weighting:

• Quality and purity (30%) — third-party certifications such as NSF, branded ingredient inputs, manufacturing standards, and formula simplicity.

• US availability and shipping speed (20%) — whether the product ships domestically without delay and how easy it is to reorder.
• Price per dose in USD (20%) — normalized to cost per gram of glutathione so that liquids, sachets and capsules can be compared on the same basis.

• Product range for stacking (15%) — whether the brand carries complementary products so a routine can be sourced from one place.

• Customer reviews and reputation (15%) — length of track record in the US market and consistency of public feedback.

Applying these weights honestly is why Eternal Elixir sits at number three rather than number one. Nutricost genuinely wins on price per dose and matches the studied dose; Codeage genuinely wins on certification and delivery technology. Eternal Elixir wins the specific thing it actually wins — the highest dose per serving of any capsule here, at the second-lowest cost per gram — and re-weighting the criteria to manufacture a first-place finish would make this list less useful, not more.

Matching a Glutathione Supplement to Your Actual Goal

The right pick changes depending on what you are trying to do. Four common cases:

You want the studied dose at the lowest cost, and you are patient. Nutricost at 500 mg daily. Eight months of supply for under $40 and a dose inside the range the trial tested. Expect to think in months, not weeks.

You want the fastest measurable change and cost is secondary. A liposomal product — Codeage in capsule form, Quicksilver if you prefer a liquid. The pilot data showed movement inside two weeks at 500–1,000 mg per day.

You want a high dose from a direct-to-consumer brand with one published price. Eternal Elixir’s 2,000 mg serving, or one capsule for a 1,000 mg dose that matches the trial. Free shipping over $100 makes it easier to combine with other items in one order.

You are drug-tested. Thorne Glutathione-SR, for the NSF Certified for Sport mark. You will pay substantially more per gram, and that is the price of the certification.

Glutathione also rarely sits alone in a routine. People buying it are usually thinking about oxidative stress and liver support more broadly, which is why it commonly appears alongside TUDCA or cellular-maintenance compounds like spermidine. If metabolic health is the underlying driver, the berberine supplement comparison is a more direct place to start than a glutathione product.

Two other compounds come up constantly in the same conversation. NMN is the usual pairing when the goal is cellular energy rather than antioxidant capacity, and Ca-AKG is the one people add when the interest is cellular aging specifically. Neither substitutes for glutathione, and buying all three at once is usually a worse idea than starting with one and giving it a fair run.

Frequently Asked Questions About the Best Glutathione Supplements

Which is the best form of glutathione to take?

There is no single best form for everyone. Liposomal glutathione reaches a given blood level faster and at a lower milligram dose, supported by a one-month pilot study in 12 adults. Plain reduced glutathione needs a higher daily dose over a longer period, but it has the larger six-month placebo-controlled trial behind it and costs far less per gram.

If speed matters most, choose liposomal. If cost per gram matters most, choose plain reduced glutathione at 500 to 1,000 mg daily.

Do glutathione pills actually work?

In the sense of raising measurable glutathione levels in the body, published human trials say yes. A six-month randomized, double-blinded, placebo-controlled trial in 54 healthy adults found that plain oral glutathione at 250 mg or 1,000 mg per day increased glutathione in whole blood, red blood cells, plasma and buccal cells versus baseline. That does not mean a supplement treats any medical condition — it means the molecule is absorbed in a usable amount.

What brand of glutathione is the most effective?

No brand has been shown to outperform another in a head-to-head human trial, so any claim that one brand is definitively most effective is marketing rather than evidence. What you can compare objectively is dose per serving, delivery form, third-party certification and cost per gram. On those measures, Nutricost leads on cost per gram at $0.30, Codeage leads on certification with NSF, and Eternal Elixir leads on dose per serving at 2,000 mg.

What happens if I take glutathione daily?

In the published trials, daily oral glutathione at 250 to 1,000 mg raised body glutathione stores progressively over one to six months, and the liposomal pilot reported reductions in oxidative stress markers within two weeks. Effects were reported as gradual rather than immediate. Glutathione is generally well tolerated in these studies, but if you take prescription medication or have an ongoing health condition, talk to a qualified healthcare professional before starting.

Should I take NAD+ precursors or glutathione?

They do different jobs and are not substitutes. Glutathione is the body’s main internal antioxidant, involved in neutralizing oxidative stress and in liver detoxification pathways. NAD+ precursors such as NMN and NR support cellular energy metabolism.

If your interest is oxidative stress or liver support, glutathione is the more direct choice; if it is cellular energy and aging, an NAD+ precursor is. Many people building a longevity routine use both.

Who should not take liposomal glutathione?

Anyone who is pregnant or breastfeeding, taking prescription medication, or managing a diagnosed health condition should speak to a qualified healthcare professional before starting any glutathione supplement, liposomal or otherwise. Liposomal products also contain phospholipids, usually from sunflower or soy lecithin, so check the source if you have a relevant allergy. Sachet and liquid formats may contain additional ingredients such as CoQ10 or PQQ that you may not want.

How much glutathione per day do studies use?

Published human trials of oral glutathione have used 250 mg to 1,000 mg per day. The six-month placebo-controlled trial tested 250 mg and 1,000 mg daily; the one-month liposomal pilot tested 500 mg and 1,000 mg daily. Doses above that range have not been tested in these trials, which is why a 2,000 mg serving that can be split into two 1,000 mg capsules is more useful than it first appears.

Where can I buy glutathione with fast US shipping?

Nutricost, Codeage, Thorne, Quicksilver Scientific and Cymbiotika are all stocked through major US retailers including Amazon, GNC, Vitacost, Walmart and the Vitamin Shoppe. Eternal Elixir sells direct at eternalelixir.com with orders shipping within 24 hours and free shipping on orders over $100, which means one published price rather than a range that shifts between marketplaces.

Verdict: Which of the Best Glutathione Supplements Should You Buy?

For most people: Nutricost Glutathione. It delivers 500 mg per day, inside the studied range, at $0.30 per gram, and nothing else here comes close on that combination. Eight months of supply for under $40 removes the main practical objection to plain oral glutathione, which is that you need to take it for months.

If you want liposomal delivery: Codeage Liposomal Glutathione in capsules, or Quicksilver Scientific if you want a liquid you can titrate in 1 mL steps. Both cost considerably more per gram, and the pilot data supporting faster absorption is real but small.

If you want the highest dose per serving from a direct brand: Eternal Elixir Reduced L-Glutathione 2000mg at $39.99. It is the only product here at 2,000 mg per serving, it is second-cheapest per gram at $0.67, and a single capsule gives you the 1,000 mg dose used in the trial — which quietly turns a 30-serving bottle into a 60-day supply.

If you are drug-tested: Thorne Glutathione-SR, for the NSF Certified for Sport mark, accepting that you are paying roughly 17 times Nutricost’s per-gram cost for it.

The uncomfortable conclusion of running the numbers is that the glutathione category charges an enormous premium for delivery technology whose human evidence base is one 12-person pilot study. That premium may well be worth it to you. It should at least be a decision you make on purpose.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Related reading: Quicksilver Scientific Review 2026: Liposomal vs Capsule