Ingredient profile
Milk Thistle in Slim Metrix: What It Can and Cannot Do
Slim Metrix lists milk thistle seed extract, standardized to 80% silymarin, third in its 276 mg blend; the amount is not published. Milk thistle is sold for liver support, but trials in liver disease found no clear benefit, and it has not been studied for weight. Skip it if you are allergic to ragweed-family plants.
Written by the Slim Metrix editorial teamUpdated
Label facts
How much milk thistle is in Slim Metrix?
The amount is not on the label. Milk thistle seed extract is the third of eight ingredients in a 276 mg proprietary blend, so its weight is part of that total (Slim Metrix label graphic).
Because blend ingredients are listed from heaviest to lightest (FDA: labeling guide (proprietary blends)), milk thistle weighs no more than green tea extract or alpha lipoic acid, which come before it. The label gives no milligram figure for any of the three. Split equally, each of the eight would be about 34.5 mg, but that is only a picture; the real split is not published.
| Name on the label | Milk thistle (Silybum marianum) seed extract, 80% silymarin |
|---|---|
| What it is | Silybum marianum seed |
| Form | Herbal extract (silymarin) |
| Amount per capsule | Part of the 276 mg blend (not disclosed) |
| What research used | Liver-disease trials: no clear benefit |
| Strength of evidence | Not studied for weight |
| Why it is sold | Sold for liver support |
| Main caution | Avoid if allergic to ragweed or daisy-family plants; may interact with drugs such as warfarin and sirolimus. |
Why it is there
Why is milk thistle in a weight-management capsule?
The label does not explain it, and no weight-loss research is behind it. Milk thistle is usually sold for liver support, not for weight.
The seller's short ingredient list names milk thistle alongside chromium, zinc, green tea, berberine and resveratrol. None of the sources on this site studied milk thistle for body weight, appetite or blood sugar control. So its place in the formula rests on its liver reputation, and that reputation is weaker than the marketing around it, as the next section shows.
| Plant | Silybum marianum (milk thistle) seed |
|---|---|
| Standardized to | 80% silymarin |
| Place in the blend | Third of eight |
| Amount per capsule | Not published |
| Studied for weight | No |
The research
Does milk thistle protect the liver?
The evidence does not show that it does. NCCIH says there is not enough high-quality evidence to draw firm conclusions about milk thistle for liver disease, and two studies it funded found no benefit from silymarin (NCCIH: milk thistle).
| Source | Finding |
|---|---|
| NCCIH | Not enough evidence for liver disease; no benefit in two funded studies (NCCIH: milk thistle) |
| Memorial Sloan Kettering | A large hepatitis C trial saw no drop in ALT, a liver enzyme, and no change in outcomes (MSK About Herbs: milk thistle) |
| LiverTox | Not linked to liver enzyme rises or acute liver injury (score E) (LiverTox: milk thistle) |
| StatPearls | Liver toxicity seen only in cancer trials using 10 to 20 g of silybin a day (StatPearls: milk thistle) |
So milk thistle looks gentle on the liver, but it has not proven it helps the liver either. Those are two separate findings.
A common hope
Does milk thistle cancel out the liver risk of green tea extract?
No study cited here shows that. Green tea extract remains a rare but well-established cause of liver injury (LiverTox: green tea), and adding milk thistle to the same capsule has not been tested as a fix.
It is easy to read a formula and assume one ingredient balances another. The research does not support that idea for this pair. If you have had liver trouble, the advice stays the same: talk to your doctor before you start, and read our article on green tea extract and the liver.
Step by step
How should you start Slim Metrix if you are thinking about milk thistle?
Check your allergies first, then take one capsule in the morning. The four steps below build in the milk thistle checks.
- 01
Check the label and your allergies
Read the Supplement Facts on your own bottle. If ragweed, daisies or similar plants give you allergies, stop here and talk to your doctor.
- 02
One capsule, in the morning
The label graphic says adults take one capsule a day, preferably in the morning. Never take more than one.
- 03
Tell your pharmacist
Mention warfarin, sirolimus or any other medicine you take. Keep eating well and staying active; the capsule is an add-on at most.
- 04
Review at 60 days
Weigh in weekly, note your waist, and decide before the 60-day refund window ends.
Safety first
Who should avoid milk thistle?
People allergic to ragweed, daisies or related plants should not take it. People on warfarin or sirolimus should ask first.
- Allergy: milk thistle can cause allergic reactions in people sensitive to the ragweed and daisy family (NCCIH: milk thistle) (MSK About Herbs: milk thistle).
- Stomach: it is usually well tolerated, but upset stomach can happen (NCCIH: milk thistle).
- Warfarin and sirolimus: milk thistle may interact with both (MSK About Herbs: milk thistle). Ask the doctor who manages these drugs.
Every other ingredient brings its own list. See the full table on our side effects page, and check who Slim Metrix is for.
Our honest take
Is milk thistle a reason to choose Slim Metrix?
Not on the evidence. Milk thistle looks low-risk for most people, but it adds no proven benefit for weight or for the liver.
In its favor
- Not linked to liver injury at usual doses
- Usually well tolerated
- Named on the label with its strength (80% silymarin)
Against
- Never studied for weight
- No clear liver benefit in trials
- Amount per capsule not published
- Allergy risk with ragweed-family plants
- May interact with warfarin and sirolimus
If liver health is your main worry, a doctor's checkup and routine blood tests tell you far more than any capsule can. Weight loss of 5 to 10% over 6 months, through eating and activity changes, is the goal NIDDK sets for a safe program (NIDDK: choosing a safe weight-loss program).
The rest of the formula
What other ingredients are in Slim Metrix?
Two minerals and seven more blend ingredients, each on its own page.
FAQ
Milk thistle in Slim Metrix: common questions
Does milk thistle help with weight loss?
No evidence shows that it does. None of the sources on this site studied milk thistle for weight, and it is usually sold for liver support instead. In Slim Metrix it is one of eight ingredients in a 276 mg blend, with no published amount (Slim Metrix label graphic).
Is milk thistle good for a fatty or damaged liver?
The research does not show a clear benefit. NCCIH says the evidence is not strong enough for firm conclusions about liver disease (NCCIH: milk thistle), and a large hepatitis C trial found no improvement (MSK About Herbs: milk thistle). If you have any liver condition, follow your doctor's plan rather than a supplement.
What is silymarin?
Silymarin is the main group of compounds in milk thistle seed, and it is what the NCCIH-funded studies tested (NCCIH: milk thistle). The Slim Metrix label says its milk thistle seed extract is 80% silymarin (Slim Metrix label graphic). That tells you the extract's strength, not the amount in each capsule.
Can I take Slim Metrix if I am allergic to ragweed?
Talk to your doctor first, and expect the answer to be no. Milk thistle can trigger allergic reactions in people sensitive to ragweed and daisy-family plants (NCCIH: milk thistle), and Memorial Sloan Kettering says those people should not take it (MSK About Herbs: milk thistle). Slim Metrix lists milk thistle third in its blend.
Is milk thistle safe with warfarin?
Ask your doctor before combining them. Memorial Sloan Kettering says milk thistle may interact with warfarin (MSK About Herbs: milk thistle), and Slim Metrix also contains resveratrol and Korean ginseng, which may affect bleeding or clotting (MSK About Herbs: resveratrol) (NCCIH: Asian ginseng). Bring the full label to that visit.
Can milk thistle harm the liver?
Not at usual doses, as far as research shows. LiverTox gives it a score of E, meaning no link to liver injury (LiverTox: milk thistle). Liver toxicity appeared only in cancer trials that used 10 to 20 g of silybin a day (StatPearls: milk thistle). That is 36 to 72 times the weight of one capsule's whole 276 mg blend.
Who wrote this
Written and reviewed by
Plain-language pages built from the brand's label graphic, the sales page and linked medical sources.
Last updated . Read our editorial standards and how we check reviews. This website is run by a U.S. stocking partner for Slim Metrix, not by the manufacturer. We earn money when you buy through our order links.
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