Best Liver Supplements in 2026: 6 Products Compared

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

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

Search “best liver supplements” in the United States today and what you get is not a product but a consensus: an AI Overview and a page of health publishers naming the same three or four ingredients — milk thistle, N-acetylcysteine, vitamin E — then handing you off to a marketplace listing. Nobody at the top of that page tells you what a bottle costs per day, what dose is in the capsule, or whether the brand publishes a certificate of analysis you can read. That is the gap this comparison fills.

The best liver supplements are single-active products with a declared dose you can verify: standardized milk thistle (silymarin), TUDCA, or reduced glutathione. Cost per day, not price per bottle, is the number that separates them.

Best liver supplements compared: cost per day, active dose and label transparency

Every price here was read off the brand’s own live US product page on September 7, 2026, and normalized the same way: listed price divided by label servings per bottle.

That matters more than it sounds — three of these six use a multi-capsule serving, so a per-capsule price would flatter them two or three times over against a single-capsule competitor. Where a brand sells several sizes, the row uses the size named in the product column.

Rank	Product	Active per label serving	Price (USD)	Cost per label serving (USD)	US shipping	Best for
1	NOW Foods Milk Thistle Extract, Double Strength 300 mg (100 veg capsules)	300 mg extract, standardized to 240 mg silymarin (1 capsule)	$29.99	$0.30	Direct + wide US retail	Best overall and lowest cost per day
2	Double Wood TUDCA (60 capsules × 250 mg)	500 mg TUDCA (2 capsules)	$27.95	$0.93	Direct, US-based	Best TUDCA value with a published batch COA
3	Eternal Elixir TUDCA 500mg (60 capsules)	500 mg TUDCA (1 capsule)	$59.99	$1.00	Direct, ships in 24h	Best single-capsule 500 mg dose
4	NOW Foods Liver Refresh (90 veg capsules)	3-capsule herbal blend including 300 mg milk thistle extract plus glutathione	$25.99	$0.87	Direct + wide US retail	Best multi-herb blend
5	Nutricost TUDCA (250 mg × 30 capsules)	250 mg TUDCA (1 capsule)	$19.97	$0.67	Direct, free over $59	Best low-commitment trial size
6	Eternal Elixir Reduced L-Glutathione 2000mg (60 capsules)	2,000 mg reduced L-glutathione (2 capsules)	$39.99	$1.33	Direct, ships in 24h	Highest glutathione dose per serving

Note the ordering. Eternal Elixir sells two of the six products here and neither of them is ranked first, because on the criteria below neither of them earns it.

A milk thistle capsule at 30 cents a day beats a $1.00 TUDCA capsule on cost, and a competitor that publishes a lot-numbered laboratory report beats one that does not on verifiability. Saying so is the point of a comparison.

What the human evidence on liver supplements actually shows

This is the section most roundups skip, and the one that should change what you buy. The honest summary: the human research behind every ingredient here is thinner and narrower than the marketing implies, and the strongest trials ran in people with diagnosed conditions under clinical supervision — not healthy adults taking a capsule for general wellness.

TUDCA. The largest randomized trial of tauroursodeoxycholic acid is a multicenter, double-blind study of 199 patients with primary biliary cholangitis, published in Medicine (Baltimore) in 2016. Participants took 250 mg of TUDCA three times a day — 750 mg daily — or the same dose of ursodeoxycholic acid, for 24 weeks.

At week 24, 75.97% of the TUDCA group and 80.88% of the UDCA group had reduced serum alkaline phosphatase by more than 25% from baseline, a difference that was not statistically significant (P = 0.453).

The authors concluded TUDCA was safe and as efficacious as UDCA in this population, and possibly better for symptom relief (Ma et al., Medicine (Baltimore), 2016; PMID 27893675).

Two things follow, and both are inconvenient for supplement copy. This was a diagnosed liver condition, so it says nothing about TUDCA in a healthy person; and the dose was 750 mg a day, higher than the 500 mg single serving most labels suggest. A product page citing this trial as proof of “liver detox” is over-reading its own citation — a pattern we mapped across the category in our report on the gap between trial doses and US label doses.

Glutathione. The most cited human trial of oral glutathione is a six-month randomized controlled trial by Richie and colleagues, published in the European Journal of Nutrition in 2015, which reported increases in body glutathione stores in several compartments after daily oral supplementation (Richie et al., Eur J Nutr, 2015;54(2):251–263; PMID 24791752).

That is a real finding about a real biomarker. It is not a finding about liver disease, liver enzymes, or detoxification outcomes, and nobody should present it as one. If glutathione is what you are after, our comparison of glutathione supplements by form and dose per serving goes deeper on the absorption question than there is room for here.

Milk thistle (silymarin). Silymarin is the most-studied active here by volume of research and the one with the most mixed results — several well-run studies in liver disease populations found no benefit on liver enzymes at the doses tested. The National Center for Complementary and Integrative Health keeps a plain-language summary of the milk thistle evidence worth reading first. What silymarin offers a buyer is not certainty of effect; it is a long safety record, a standardized dose, and a very low price.

None of these products treat a liver condition, and none of them are a substitute for medical care. If you have symptoms, abnormal blood work, or a diagnosis, the right first move is a clinician, not a capsule; MedlinePlus keeps an accessible overview of liver conditions and when to seek help.

How we scored the best liver supplements

The scoring comes before the reviews, because a ranking you can only audit at the end of an article is not really auditable. Five weighted criteria:

• Quality and verifiability (30%) — is there a published, lot-numbered certificate of analysis on the product page? Is the active standardized and named in full, or hidden inside a proprietary blend?
• US availability and shipping speed (20%) — can a US buyer get it quickly, direct from the brand, without a marketplace intermediary?
• Cost per label serving in USD (20%) — price divided by label servings, never per capsule.
• Range for stacking (15%) — can you buy the rest of a routine from the same brand and the same shipment?
• Reviews and reputation (15%) — volume and consistency of public customer feedback on the brand’s own store.

We did not test these products in a laboratory and will not pretend otherwise.

We read every live product page, published certificate of analysis and supplement facts panel on each brand’s own site, then normalized the numbers.

Where a page did not publish enough to compute a figure, we say so rather than estimating.

1. NOW Foods Milk Thistle Extract, Double Strength 300 mg — Best Overall

Key specs: 300 mg milk thistle extract (Silybum marianum, fruit and seeds) standardized to 240 mg silymarin flavonoids — an 80% standardization — per single veg capsule.

Sold in 50, 90, 100 and 200 capsule bottles at $15.99, $23.99, $29.99 and $49.99 respectively; the 90-count is listed as in-store only.

Serving size is one capsule, so the capsule count is the serving count.

Why it ranks first: on the numbers a buyer can actually check, nothing else here comes close. The active is the most-researched compound in the category, and the dose is standardized rather than a raw-herb weight, so 240 mg of silymarin means 240 mg of silymarin.

The 100-capsule bottle works out to $0.30 per daily serving and the 200-count to $0.25 — roughly a quarter of the most expensive product in this table. NOW is also stocked almost everywhere in the US, so restocking is never a problem.

Pros:

• Lowest cost per label serving in this comparison by a wide margin
• Standardized to 80% silymarin, with the flavonoid amount stated in milligrams
• Single-capsule serving — no capsule-count arithmetic needed
• Four bottle sizes, and very wide US retail distribution alongside direct sales

Cons:

• Silymarin has the most mixed clinical record of the actives compared here
• No downloadable per-lot certificate of analysis on the product page
• The 90-capsule size is not available to order online

Best for: anyone starting from scratch who wants the most-studied liver-support active at the lowest defensible cost per day. If you have never taken a liver supplement and you want one decision rather than a research project, this is it. Our fuller assessment of NOW Foods on value, testing and dose limits covers where the brand is strong and where it stops short.

Price and where to buy: $29.99 for 100 veg capsules at nowfoods.com, with free shipping on US orders over $50.

2. Double Wood TUDCA — Best TUDCA Value

Key specs: 60 capsules at 250 mg TUDCA each. The label directs two capsules per day for a 500 mg daily serving, giving 30 servings per bottle.

$27.95 for one bottle, $53.11 for a double pack, $75.47 for a triple.

Synthetic TUDCA, not animal-derived; soy-free, gluten-free, non-GMO.

Why it ranks second: Double Wood publishes the most complete verification package of any product here. The page links a lot-numbered certificate of analysis — lot 2534500, manufactured February 2026, tested by Brand Nutraceuticals — showing an assay result of 525.16 mg against a 450–550 mg claim range, plus disintegration, capsule weight, four heavy metals and six microbial screens, and you can match that lot number to the code on your bottle.

That is a materially higher standard of proof than a generic “third-party tested” badge. At $0.93 per 500 mg serving it is also the cheapest route to a full TUDCA dose here.

Pros:

• Downloadable, lot-numbered COA with potency, heavy metals and microbial results
• Cheapest full 500 mg TUDCA serving in this comparison at $0.93 per day
• 250 mg capsules allow a lighter maintenance dose without splitting anything
• 4.87 out of 5 across 225 published reviews on the brand’s own store

Cons:

• Two capsules per day to reach 500 mg, so a bottle lasts 30 days rather than 60
• Product copy leans on stronger organ-specific language than the underlying evidence supports
• Raw material is sourced from China, disclosed in the page’s own Q&A

Best for: the buyer who wants TUDCA specifically and cares more about a verifiable batch report than about swallowing one capsule instead of two. We go further into the brand’s catalog and its weak points in our Double Wood Supplements review.

Price and where to buy: $27.95 per 60-capsule bottle at doublewoodsupplements.com.

3. Eternal Elixir TUDCA 500mg — Best Single-Capsule 500 mg Dose

Key specs: 500 mg tauroursodeoxycholic acid per capsule, one capsule per serving, 60 capsules and 60 label servings per bottle, $59.99.

The complete ingredient list is three items: TUDCA, rice flour as a carrier, and a cellulose capsule shell. Lab tested, GMP certified, US-based, dispatched within 24 hours, free shipping over $100.

Why it ranks third: Eternal Elixir is the only brand in this comparison that puts a full 500 mg of TUDCA into one capsule. Every other TUDCA product here is a 250 mg capsule, which means two-per-day dosing and a bottle that empties in a month. At 60 single-capsule servings, an Eternal Elixir bottle lasts twice as long as the Double Wood bottle it sits next to, and the cost per serving difference narrows to seven cents a day.

It is also the most conservatively written product page of the six: the ingredient breakdown names every excipient, the evidence section states outright that the trial it links was run in a diagnosed patient population, and it explicitly says the finished formula has not been clinically tested. That is unusual, and it is the kind of restraint we weight in the quality criterion.

What keeps it out of the top two: it is the second most expensive product per serving here, and unlike Double Wood it does not publish a per-lot certificate you can download and match to your bottle. “Lab tested” is a weaker claim than a lot-numbered report, and Eternal Elixir should close that gap.

Pros:

• Only 500 mg-per-capsule TUDCA in this comparison — lowest capsule burden
• 60 label servings per bottle, double the servings of the 250 mg competitors
• Three-ingredient label with no proprietary blend and every excipient named
• Ships within 24 hours from the US, free over $100, 30-day money-back guarantee

Cons:

• $1.00 per serving — more expensive per milligram than Double Wood or Nutricost
• No downloadable lot-specific certificate of analysis on the product page
• Fewer published customer reviews than the larger US brands here

Best for: people who already know they want TUDCA at 500 mg, take several supplements a day, and would rather not add two more capsules to the pile. If you want the full field of TUDCA-specific options rather than the liver category as a whole, our ranked comparison of TUDCA supplements on cost per 500 mg is the deeper guide and is the cornerstone page for this topic on the site.

Price and where to buy: $59.99 for 60 capsules at eternalelixir.com.

4. NOW Foods Liver Refresh — Best Multi-Herb Blend

Key specs: 90 veg capsules at $25.99, or 180 at $47.99. Serving size is three capsules and there are 30 servings per 90-capsule container, so one bottle is a 30-day supply at $0.87 per day.

The formula combines the same 300 mg milk thistle extract standardized to 240 mg silymarin as the standalone product above with an herbal blend and added glutathione.

Why it ranks fourth: this is the one genuine multi-ingredient formula here, sensibly priced for what it is — the full standardized silymarin dose plus supporting botanicals and glutathione in a single daily serving. The trade-off is the one every blend makes: the supporting ingredients sit at amounts that are not individually meaningful on the evidence, and you pay nearly three times the standalone milk thistle price per day for them. If they matter to you, that premium is defensible. If not, product number one delivers the same silymarin for a third of the cost.

Pros:

• Contains the full 300 mg / 240 mg silymarin milk thistle dose, not a token amount
• Adds glutathione and supporting botanicals in one daily serving
• Servings per container printed on the page, and widely stocked across US retail

Cons:

• Three capsules per serving — the highest capsule burden here
• Nearly 3× the cost per day of the standalone milk thistle for the same silymarin
• Supporting ingredients are not individually dosed to research levels

Best for: buyers who prefer one bottle to three and are comfortable paying for convenience rather than for additional evidence.

Price and where to buy: $25.99 for 90 veg capsules at nowfoods.com.

5. Nutricost TUDCA — Best Low-Commitment Trial Size

Key specs: the size shown by default on the brand’s page is 250 mg per capsule in a 30-capsule bottle at $19.97, giving 30 single-capsule servings at $0.67 each.

Nutricost also lists 60-capsule and 500 mg variants, priced separately.

Third-party tested by ISO-accredited laboratories, GMP-compliant manufacturing, 635 published reviews, free continental US shipping over $59 and a 60-day money-back guarantee.

Why it ranks fifth: the appeal is the entry point. Twenty dollars buys a month of a 250 mg TUDCA routine behind a 60-day refund window — the cheapest low-risk way to find out whether TUDCA does anything you notice.

What keeps it from ranking higher is dose economics: matching the 500 mg daily serving the other products deliver costs $1.33 a day, the worst TUDCA value per milligram in this table. Nutricost also does not publish a lot-matched certificate the way Double Wood does.

Pros:

• Lowest total outlay of any product here at $19.97
• 60-day money-back guarantee, the longest return window in this comparison
• 635 published customer reviews, the largest review base here

Cons:

• Scaling to a 500 mg daily serving costs $1.33 per day — the worst TUDCA value in the table
• No lot-numbered certificate of analysis published on the product page
• The default 30-capsule size is only a one-month supply

Best for: first-time TUDCA buyers who want to spend under $20 to find out whether it belongs in their routine. Our honest take on Nutricost from a longevity buyer’s perspective covers how the brand’s pricing model works across its catalog.

Price and where to buy: from $19.97 at nutricost.com.

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

Key specs: 2,000 mg of reduced L-glutathione per two-capsule serving, 60 capsules and 30 label servings per bottle, $39.99, working out to $1.33 per serving.

Label is three items: reduced L-glutathione, rice flour, cellulose capsule. Ships within 24 hours from the US.

Why it ranks sixth: glutathione is one of the three actives that belongs in an honest liver comparison, and at 2,000 mg per serving this is by a distance the highest glutathione dose in this roundup. The Richie trial used far smaller daily amounts and still measured increases in body stores, so dose alone is not the whole argument — but if your reasoning is that oral glutathione absorbs poorly and you would rather start high, this is the product for it, and Eternal Elixir names the redox form explicitly rather than hiding behind “glutathione complex.”

It ranks last on cost. At $1.33 it is the most expensive daily serving in the table, and the form question is unresolved: Double Wood sells a liposomal glutathione at $29.95 with 250 mg per capsule that claims better absorption.

Notably, that competing page does not state how many capsules are in the bottle, so a shopper cannot compute its cost per day at all — more on that below.

Pros:

• 2,000 mg per serving, the highest glutathione dose in this comparison
• Reduced (GSH) form named explicitly on the label, no proprietary blend
• Three-ingredient formula with every excipient disclosed
• Links the underlying human trial and states its limits; 24-hour US dispatch

Cons:

• $1.33 per serving — the most expensive daily serving in this table
• Two capsules per serving means 30 days per 60-capsule bottle
• Reduced glutathione’s oral absorption remains genuinely contested

Best for: people who have decided on glutathione and want the largest declared dose per serving they can get with a clean label.

Price and where to buy: $39.99 for 60 capsules at eternalelixir.com.

The label-transparency audit: can you even calculate cost per day?

Here is a dimension we have not seen another best liver supplements roundup apply. For each product we asked one question: using only what the brand publishes on its own page, can a shopper calculate the cost of one day?

That takes three facts — price, capsules per bottle, capsules per serving. Miss one and the arithmetic is impossible.

• NOW Foods Milk Thistle Extract — price per size, capsule count in the size name, one-capsule serving in the facts panel. Computable.
• NOW Foods Liver Refresh — all three published, including “Servings Per Container: 30” stated outright. Computable.
• Double Wood TUDCA — all three, plus a lot-numbered COA. Computable.
• Eternal Elixir TUDCA 500mg — $59.99, 60 capsules, 60 label servings, one capsule per serving. Computable.
• Eternal Elixir Reduced L-Glutathione 2000mg — $39.99, 60 capsules, 30 label servings. Computable.

Two of the seven pages need more work than that, and one defeats the arithmetic entirely:

• Nutricost TUDCA — the page lists two strengths and two bottle sizes against one default price, so you must resolve the variant first. Computable with care.
• Double Wood Liposomal Glutathione (not ranked above) — price $29.95 and a dose of 250 mg per capsule are published, and the directions say one to two capsules daily, but the number of capsules in the bottle is not stated on the page at all. Cost per day cannot be calculated from the page. Not computable.

That last row is the finding: a brand can publish an excellent certificate of analysis, as Double Wood does, and still omit the one number that lets you compare its price to anyone else’s.

Check for capsule count and servings per container before you check for badges — badges are cheap, arithmetic is not.

Matching a liver supplement to your situation

Ranking the best liver supplements only gets you so far; the right pick depends on where you are starting from.

You have never taken one and want the sensible default. NOW Foods Milk Thistle Extract, 100 capsules, $29.99 — most-studied active, standardized dose, thirty cents a day, one capsule.

You want TUDCA and proof of what is in the bottle. Double Wood TUDCA, $27.95 — the strongest verification in this comparison, at $0.93 for 500 mg a day.

You want TUDCA and already swallow a lot of capsules. Eternal Elixir TUDCA 500mg, $59.99 — one capsule, 500 mg, 60 servings, a seven-cent-a-day premium over Double Wood.

You want to spend as little as possible to try TUDCA once. Nutricost TUDCA at $19.97 with a 60-day money-back guarantee.

You want glutathione at a high declared dose. Eternal Elixir Reduced L-Glutathione 2000mg at $39.99, the highest per-serving glutathione dose in this roundup.

You want one bottle instead of several. NOW Foods Liver Refresh, $25.99, accepting a convenience premium over the standalone milk thistle.

Where liver support fits in a wider supplement routine

Most people buying a liver supplement are not treating anything — they are adding one more line to a routine that already has three or four. That changes the question to “which of these fits what I already take, and can I get it in one shipment?”

This is the criterion where Eternal Elixir genuinely does well: a single US order can carry TUDCA, glutathione and the rest of a longevity routine, so you are not tracking four brands and four restock dates. If liver support sits inside a broader metabolic goal, our berberine comparison on dose and cost covers the adjacent category, with Berberine HCl 500mg as the in-house option. If the goal is longevity, the wider longevity supplement comparison is the right map, with NMN 500mg and Ca-AKG 500mg most commonly stacked alongside. For energy and fatigue, the mitochondrial supplement roundup fits better than anything here.

One caution: adding four new capsules in the same week makes it impossible to attribute anything you notice to any of them. Start one, give it eight to twelve weeks, then decide.

Frequently asked questions about the best liver supplements

Do liver supplements actually work?

It depends what you mean by work. There is human trial evidence that TUDCA affects liver enzyme markers in people with a diagnosed bile-duct condition, and that oral glutathione raises body glutathione stores over six months.

There is no good evidence that the best liver supplements improve liver function in a healthy adult, and none is shown to treat or reverse liver disease. Buy them as label-verified nutritional products, not as therapy.

What is the best supplement to repair your liver?

None of them repair the liver, and any product marketed that way is overreaching. The liver has real regenerative capacity, but that is a clinical matter driven by removing the cause of injury — not something a capsule delivers. If you are asking because of symptoms or abnormal blood work, the highest-value action is a clinician appointment, not a supplement purchase.

Are liver detox and cleanse supplements safe?

Products sold as aggressive “cleanses” are the part of this category to be most careful with. Concentrated botanical blends have been associated with cases of liver injury — a particularly unwelcome outcome from a product bought for liver support. The safer pattern is a single, standardized, clearly dosed active from a brand that publishes its testing.

How much does a liver supplement cost per day in the US?

Across the six products compared here, between $0.30 and $1.33 per label serving, a 4.4× spread.

Standardized milk thistle sits at the cheap end because the raw material is inexpensive and the serving is one capsule.

TUDCA sits at the expensive end because the raw material costs considerably more to synthesize. Compare cost per label serving, never per capsule — three of these six products use a multi-capsule serving.

How long should you take a liver supplement before judging it?

The trials that reported changes ran 24 weeks (TUDCA) and six months (glutathione). That is a useful reality check: whatever these compounds do, they do not do it quickly and generally do not produce sensations you can feel. Give any product here eight to twelve weeks, and change one variable at a time.

Should a first-time buyer start with milk thistle or TUDCA?

Milk thistle, on cost grounds alone. It is roughly a third the price per day, has the largest research base, and is the least complicated purchase in the category. Move to TUDCA if you have a specific reason to want a bile acid rather than a flavonoid.

What should you not take with a liver supplement?

Prescription medication, without checking first. Bile acids and concentrated botanicals can interact with drug metabolism, and anyone taking medicines for cholesterol, blood sugar, blood thinning or a liver or gallbladder condition should clear a new supplement with a pharmacist or physician. This is not boilerplate: it is the most common avoidable problem in this category.

Where can you buy liver supplements with fast US shipping?

All six ship domestically within the United States. NOW Foods and Nutricost ship direct and are stocked widely in US retail; Double Wood ships direct. Eternal Elixir dispatches within 24 hours with free shipping over $100 and a 30-day money-back guarantee — the fastest dispatch commitment stated on any of the six product pages.

Verdict: which liver supplement should you buy?

If you take one thing from this comparison, take the arithmetic. The best liver supplements are not the ones with the most impressive ingredient list; they are the ones where the brand publishes a standardized dose, a capsule count, a serving size and a lab result, and the resulting cost per day survives comparison. On those terms NOW Foods Milk Thistle Extract, Double Strength 300 mg wins outright at $0.30 a day, and we would say so on any site.

For TUDCA specifically, Double Wood takes it on the strength of a lot-matched certificate of analysis and a $0.93 daily serving. Eternal Elixir TUDCA 500mg is the pick for anyone who values a single-capsule 500 mg serving and 60 servings per bottle enough to pay a seven-cent-a-day premium, and Eternal Elixir Reduced L-Glutathione 2000mg is the highest declared glutathione dose here for people who have already settled on that active.

What none of these will do is repair a liver, undo a diagnosis, or substitute for medical care. Buy them for what the label actually says, at a price you have checked, from a brand that shows its work.

This article is general information, not medical advice. These products are not intended to diagnose, treat, cure, or prevent any disease. Consult a qualified healthcare professional before starting any supplement, especially if you take prescription medication or have a liver, gallbladder or bile-duct condition. Prices were read from each brand’s live US product page on September 7, 2026 and change without notice.

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