Red yeast rice
Red yeast rice capsules and tablets from fermented rice, including formulas with coenzyme Q10. We explain what the monacolin figure on the label means, the UK 3 mg limit and the warnings that apply before you buy.Read more →
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Fermented rice, monacolins and what the label should tell you
Red yeast rice is white rice fermented with the mould Monascus purpureus. The fermentation turns the grain deep red and produces a group of compounds called monacolins, of which monacolin K is the best known. In East Asia the fermented rice has been used for centuries in cooking and as a natural colouring. As a supplement it comes mainly as capsules and tablets, and it sits alongside the rest of our plant and herb extracts.
The monacolin figure is the number that matters
Monacolin K is chemically the same molecule as lovastatin, a prescription statin. That single fact explains every rule around this ingredient. In the UK, a daily portion of a red yeast rice supplement must supply less than 3 mg of total monacolins, and that amount has to be printed on the label. The approved health claim for monacolin K was based on 10 mg per day, far above the legal limit, and the European Commission withdrew it in 2024. So you will find no cholesterol claim on this page, and none on the products either.
Strength also varies more than most shoppers expect. When 28 shop-bought brands were analysed, the monacolin K content differed more than sixtyfold, and two products contained none at all. A label that says only 600 mg extract tells you nothing about what you are actually taking.
Citrinin is the second thing to check
Some Monascus strains also produce citrinin, a mould toxin that affects the kidneys. The law caps it at 100 micrograms per kilogram in these supplements, and careful manufacturers test every batch. Treat "citrinin free" as useful only when it is backed by batch testing.
How we choose red yeast rice
We only list products that state their monacolin content per daily dose, stay under the legal limit and are tested for citrinin. We prefer one-a-day capsules and tablets, because a fixed, declared dose is easier to keep track of than a loose powder. Formulas with coenzyme Q10 make sense to us: monacolins act on the same pathway your body uses to make its own Q10. Every label passes our compliance team before a product goes live, we buy directly from the brands, and independent labs spot-check batches. You can read how we select brands and products.
Who it suits, and who should leave it alone
This is an ingredient for adults who want to follow it up with their GP and a blood test, not judge it by how they feel. It is not for anyone under 18 or over 70, not during pregnancy or breastfeeding, and not alongside a statin or any other cholesterol medication. Grapefruit and grapefruit juice increase your exposure to monacolins, so avoid both. If you take other medicines, or have liver or kidney problems, speak to your GP first. Prefer to skip statin-like compounds altogether? Many readers look at citrus bergamot extract or soluble fibre instead.
If you do choose red yeast rice, plan for a slow, boring routine: one dose a day at the same time, usually with the evening meal, and a check-up after two to three months. Many buyers add coenzyme Q10 supplements separately so they can set that dose themselves, since the amount inside combination products is often small.
Frequently asked questions
Red yeast rice is white rice that has been fermented with the mould Monascus purpureus. The process gives the grain its red colour and produces monacolins, mainly monacolin K. In East Asian cooking the fermented rice has long been used as a food and a colouring. Supplements use a concentrated extract of that same fermented rice, standardised so the monacolin content per daily dose can be declared on the label.
It tells you how much of the active fermentation compound you get per daily dose. Monacolin K is the same molecule as lovastatin, a prescription statin, so it is treated as a restricted substance in food supplements. A daily portion must supply less than 3 mg of total monacolins, and that number has to appear on the label. If a product states only the extract weight, you cannot tell what you are taking. We do not list products without a declared monacolin figure.
Almost everything on this page is a once-daily capsule or tablet. The real difference is what sits next to the extract.
| Form | What you get | Suits |
|---|---|---|
| Capsules | Extract with declared monacolins | Simplest starting point |
| Tablets | Same dose, often larger packs | Longer routines |
| With coenzyme Q10 | Extract plus a small Q10 dose | One pill instead of two |
| Culinary powder | Trace monacolins only | Cooking and colouring |
Culinary red yeast rice is a food ingredient, not a dosed supplement.
Take one dose per day, at the same time each day, with a meal. Most people choose the evening meal, because the body makes most of its cholesterol overnight and food reduces the chance of stomach upset. Do not double up if you forget a dose. Consistency matters more than timing precision, and any change is only visible in a blood test, so ask your GP to check your levels after two to three months rather than judging by how you feel.
Monacolins work on the mevalonate pathway, the same route your body uses to make its own coenzyme Q10. That is the reason manufacturers pair the two, and the reason some users take Q10 separately. Be aware of the amounts: combination products often contain 10 to 30 mg of Q10, while standalone supplements typically offer 100 mg or more. If the Q10 dose is the point for you, a separate product gives you control over it.
The restrictions are strict, and they are on the label for a reason. Red yeast rice supplements are not suitable for anyone under 18 or for adults over 70. They should not be used during pregnancy or breastfeeding. Do not combine them with a statin or any other cholesterol medication, and do not stack two red yeast rice products. Grapefruit and grapefruit juice raise monacolin exposure. With liver or kidney problems, or any prescription medicine, check with your GP first.
Several ingredients are used for the same reason without being statin-like molecules. Berberine works through a different pathway in the body, citrus bergamot polyphenols are a second common choice, and soluble fibres such as psyllium husk are the least eventful option of all. None of them carries an approved health claim in this area either, so we will not promise you an outcome. What they do offer is a route that avoids the specific warnings attached to monacolins.
Citrinin is a mould toxin that some Monascus strains produce during fermentation, and it affects the kidneys. Because it depends on the strain and the fermentation conditions, the only way to know a batch is clean is to measure it. The legal maximum in supplements based on rice fermented with Monascus purpureus is 100 micrograms per kilogram. We ask suppliers for citrinin results per batch, and we treat a "citrinin free" line without testing behind it as a marketing statement.
In the EU the direction of travel is clear. After a 2025 EFSA opinion concluded that no safe intake of monacolins from red yeast rice could be identified, member states voted in May 2026 to move monacolins to the prohibited list for food supplements, with a transitional period expected before the rules fully apply. The UK sets its own rules and currently keeps the under 3 mg restriction with mandatory labelling. We follow both frameworks, so our assortment can change if the guidance does.
