What is actually in red yeast rice, and why one number decides the bottle
A bottle on a shelf says “red yeast rice 1200 mg”. Another says the same thing and costs twice as much. Neither front label tells you how much monacolin K is inside — and that is the only number that changes anything about the bottle.
- Ingredient
- Red yeast rice (Monascus purpureus)
- Key compound
- Monacolin K
- Bottles here
- 1 formula
- Reviewed
- 2026-09-17
Red yeast rice is rice fermented with a mould. The fermentation produces a family of compounds called monacolins. One of them, monacolin K, is chemically identical to lovastatin — a prescription medicine. So the useful question about any bottle is not how many milligrams of “red yeast rice” it contains. It is how much monacolin K it contains, and whether the label says.
Why two bottles at the same weight are not the same bottle
Monacolin K is produced by the fermentation, not added to it, so the amount varies with the strain, the substrate and the process. “1200 mg of red yeast rice” is a statement about the powder. A 5% and an 80% preparation weigh exactly the same and contain very different amounts of the compound you are actually interested in. A bottle that never states its monacolin K content could hold almost none — or a dose that interacts with something you already take.
| What the label says | What it tells you |
|---|---|
| “Red yeast rice 1200 mg” | The weight of the powder. Nothing about the compound. |
| “4% monacolins” | Closer, but still a family of compounds rather than the one with the clinical literature behind it. |
| “Monacolin K — x mg per serving” | The number you can hold against a prescription list and take to a pharmacist. |
Is monacolin K the same as a statin?
The molecule is the same as lovastatin. The product is not the same as a prescription. That distinction is the whole of our position: we state the compound and its amount, and we do not write that a supplement replaces a medicine. If you take a statin, a fibrate, or anything metabolised by the same liver enzymes, this is one to raise with your doctor before adding — and grapefruit is out either way.
Why CoQ10 is in the formula
Statin-family activity reduces the body’s CoQ10, so CoQ10 is the standard companion to this ingredient in the literature rather than a marketing add-on. It is also fat-soluble, which is why the format here is an oil-based liquid drop: a fat-soluble compound in a dry tablet has less to work with.
Who should not take it
Anyone pregnant or breastfeeding. Anyone on a statin, a fibrate, or medicines metabolised by the same liver enzymes, without their doctor’s knowledge. Anyone who wants a supplement to replace a prescription — no supplement does that.
- How do I read the panel on the bottle we sell?
- Four lines: ingredient, form, what we print, what we leave out. They appear in that order on every product page in this store, so two bottles can be read against each other without relearning the layout.
- Does this page state a dose for our own bottle?
- Only where the bottle’s own Supplement Facts panel states it. The milligram line on our product page is marked as needing the physical panel photograph before launch — we would rather leave a cell empty than print an invented number.
One bottle carries this ingredient.
Read the panel row for the compound before you read the price.
| Formula | Form | What the panel prints | Price |
|---|---|---|---|
| Red Yeast Rice Drops with CoQ10 | Liquid drops, oil-based | Monacolin K, per serving | $13.99 |
Sources and scope
This page describes the ingredient, the format and what the label states. It makes no claim about diagnosis, treatment or outcome, and the milligram figures it refers to are the ones printed on the bottle.
Regulatory
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.