Key points
- On October 23, 2026, Korea's Ministry of Food and Drug Safety (MFDS) proposed a rule that would stop manufacturers from combining any of 15 functional ingredients that carry liver-related intake warnings in one product. It is not final yet; comments are open until December 23.
- MFDS says this does not mean these ingredients cause liver disease; it is a precaution against doubling up.
- Even before any change, if you take several supplements, it is worth checking now that the ingredients don't overlap.
What would change?
MFDS published a proposed partial amendment to the Standards and Specifications for Health Functional Foods (Notice No. 2026-512) on October 23, 2026. The aims are to prevent adverse events from mixing or over-consuming functional ingredients and to reflect the results of a 2025 re-evaluation of functional ingredients.
| Item | Proposal |
|---|---|
| No mixing of liver-caution ingredients | A new manufacturing standard banning combinations of functional ingredients that carry a liver-related intake warning in a single product |
| Limit on "other ingredients" | When a functional ingredient is added without a health claim (as an "other ingredient"), the amount must be under 30% of its daily intake level |
| Updated warnings | Revised intake warnings for three ingredients, including green tea extract |
| Dose basis | Daily intake levels for six ingredients based on active-compound content instead of the amount of raw material |
| Other changes | Removal of the daily upper limit for probiotics; magnesium citrate, ferrous citrate and calcium methyltetrahydrofolate added as permitted sources of magnesium, iron and folate |
According to Korean media reports, if confirmed, the mixing ban is scheduled to take effect on January 1, 2028. Because this is still a proposal, details and timing may change after public comment.
Which 15 ingredients are covered?
The list includes five ingredients with MFDS-published standards and ten individually approved proprietary ingredients.
| Type | Ingredient and typical use |
|---|---|
| Standard (5) | Garcinia cambogia extract └ Body-fat reduction (weight loss) |
| Green tea extract └ Body-fat reduction, antioxidant | |
| Conjugated linoleic acid (CLA) └ Body-fat reduction | |
| Red yeast rice └ Cholesterol | |
| Glucosamine └ Joint and bone health | |
| Individually approved (10) | Including Lyprinol green-lipped mussel oil, a fermented amino acid complex, silk protein acid hydrolysate and heat-treated green tea extract (see the MFDS notice for the full list) |
Note that many are weight-loss ingredients. Combination fat-loss products containing garcinia, green tea extract and CLA together are common.
Why is liver injury a concern?
Liver injury from supplements is uncommon. But when it happens it is hard to predict, and taking the same ingredient from several products can raise the risk. Here is what is known for the main ingredients.
Green tea extract
In 2018, the European Food Safety Authority (EFSA) concluded that clinical trials show 800 mg or more of EGCG (the main green tea catechin) per day from supplements can significantly raise liver enzymes (transaminases). EFSA could not identify a dose below 800 mg that is confirmed safe. In contrast, brewed green tea generally showed no sign of liver damage even at high intakes. The concern is concentrated extract.
Garcinia cambogia
LiverTox, the U.S. National Institutes of Health database on drug-induced liver injury, classes garcinia as a probable rare cause of clinically apparent liver injury. Early reports involved multi-ingredient weight-loss products, but acute liver injury has since been reported with products labeled as garcinia alone.
Red yeast rice
Monacolin K, the cholesterol-lowering compound in red yeast rice, is chemically the same as the prescription drug lovastatin. It can cause statin-like muscle pain and raised liver enzymes, and taking it on top of a statin means doubling up on the same kind of drug. In 2024, Kobayashi Pharmaceutical's red yeast rice products in Japan were recalled after reports of kidney disease and deaths; the Japanese government pointed to a contaminant (puberulic acid) from manufacturing. See our cholesterol supplements article for more.
Glucosamine and CLA
These two have fewer liver injury reports than the ingredients above, but they carry liver-related warnings under Korean standards and so are included. If you have liver disease, please talk to a doctor or pharmacist before taking them.
How to check your own supplements now
Until any rule takes effect, products on shelves may still combine these ingredients. And even afterward, buying separate products and taking them together is something only you can check.
- Read the ingredient list and intake warnings on the label. Mark any ingredient with wording such as "if you have liver disease" or "liver injury has been reported."
- Look for the same ingredient in two or more products. Examples: green tea extract in a weight-loss blend plus a separate catechin product, or red yeast rice plus a cholesterol combination product.
- If two or more liver-caution ingredients overlap, cut back to one. Fat-loss products in particular offer little benefit to justify stacking.
- Check against your medicines. If you take a statin with red yeast rice, or several medicines processed by the liver, ask a pharmacist to review them together.
- Watch your liver enzymes (AST, ALT) at checkups. If they rise after you start a new supplement, stop it and talk to your doctor. See our milk thistle and liver enzymes article for reference ranges.
Stop the supplement and see a doctor if you notice
- Yellowing of the whites of your eyes or skin (jaundice)
- Urine as dark as cola or deep brown
- Unexplained severe fatigue, loss of appetite or nausea
- Heaviness or pain in the upper right abdomen, or itching all over
Bring all your supplements to the appointment. In Korea, adverse events from health functional foods can be reported to the Korea Food Safety Information Service's reporting center (1577-2488) or via the Food Safety Korea portal. In the U.S., use the FDA's MedWatch.
Myths: true or false?
| Myth | What the evidence says |
|---|---|
| The 15 ingredients are bad for your liver | MFDS says the rule does not mean they directly cause liver disease; it is a precaution against overlap. Most people take them at labeled doses without problems. |
| Drinking lots of green tea damages the liver | EFSA found brewed green tea generally showed no sign of liver injury. The concern is high-dose extract supplements. |
| Natural means safe in any amount | "Natural" doesn't guarantee safety. A concentrated extract delivers far more at once than a cup of tea. |
| Taking milk thistle alongside protects the liver | There is no evidence that milk thistle prevents liver injury caused by other ingredients. Stopping the suspected product comes first. |
Please keep in mind
- This article is based on information checked as of the date shown above. New research or changes in official guidance may change the content, so please use it as a reference rather than as definitive advice.
- For an accurate diagnosis and advice about your own health, please see a doctor in person.