How to Read an Oil of Oregano Label: Herbal Equivalent, Extract and Carvacrol
By Bill, founder of Wellora · Updated October 11, 2026
Pick up three bottles of oil of oregano and you'll see three numbers that don't line up: one says 6,000 mg, one says 150 mg, one says 70% carvacrol. They can all describe a similar amount of the same thing. This guide shows you how to read an oil of oregano label, which number actually tells you how much you're getting, and how to compare brands fairly.
I'll use our own Wellora oil of oregano softgels as the worked example, because I know exactly what's in them. The same method works on any bottle.
The three numbers on an oil of oregano label
Most oil of oregano labels show some combination of these:
- Herbal equivalent (often the biggest number on the front, e.g. "6,000 mg").
- Extract weight and ratio (e.g. "from 300 mg of 20:1 extract"). This is the real weight of oregano extract in the serving.
- Carvacrol, given as a percentage ("standardized to 80%") and sometimes as milligrams ("240 mg").
Each one answers a different question. Here's what they mean.
1. "Herbal equivalent": how much plant it took to make the extract
An extract is concentrated. A 20:1 ratio means roughly 20 parts of starting plant material went into 1 part of finished extract. To express that, many brands multiply the extract weight by the ratio and print the result as an "equivalent":
300 mg of extract × 20 = 6,000 mg herbal equivalent
That's the math behind the 6,000 mg on our bag. It's useful for understanding how concentrated an extract is, but it's a poor way to compare brands, because ratios vary from product to product and two "6,000 mg" labels can contain different amounts of extract. Always look for the extract weight next to it.
2. Extract weight: what's actually in the softgel
The extract weight is the milligrams of oregano extract physically in the serving. On our label that's 300 mg per serving (2 softgels). If a label only gives you an equivalent and no extract weight or ratio, you can't work out what you're getting.
Check the serving size too. Some brands list amounts per softgel, others per serving of two or more. Ours is 2 softgels per serving, 90 servings per bag, so everything on our panel is per 2 softgels.
3. Carvacrol: the number most worth comparing
Carvacrol is the main compound in oregano oil and the one most research focuses on. The NIH's LiverTox database describes carvacrol (or thymol) as the suspected active component of oregano (LiverTox, NIH). That makes carvacrol content the fairest way to compare oil of oregano products.
If the label gives a percentage, convert it to milligrams:
Extract weight × carvacrol % = carvacrol mg
300 mg × 80% = 240 mg carvacrol per serving (120 mg per softgel)
Watch for two things:
- The percentage applies to the extract, not the "equivalent". 80% of 6,000 mg would be 4,800 mg, which isn't physically possible in two softgels.
- "Standardized to" vs. "naturally occurring". A standardized number is a target the manufacturer tests for. Ask the brand for a certificate of analysis (more on that below) to see what a given batch measured.
Worked example: our Supplement Facts panel
| What the label says | What it means |
|---|---|
| Serving size: 2 softgels · 90 servings | All amounts below are per 2 softgels. 180 softgels per bag. |
| Oil of Oregano 6,000 mg (from 300 mg 20:1 extract) | 300 mg of oregano extract, concentrated 20 to 1. |
| Naturally occurring carvacrol 240 mg | 80% of the 300 mg extract. |
| Origanum minutiflorum (leaf) | The oregano species and plant part used. |
| Black seed oil 200 mg (Nigella sativa) | A second oil, containing naturally occurring thymoquinone. |
| Other ingredients: pectin, purified water | A plant-based softgel shell instead of gelatin. |
4. The species: not all oregano is the same plant
"Oregano" covers several plants. Most supplements use Origanum vulgare. Ours uses Origanum minutiflorum, a species that grows wild in Turkey. Researchers at Hacettepe University found carvacrol made up 78.6% of the essential oil from wild O. minutiflorum plants (Hacettepe University). A label that names the species, and the plant part (leaf), is giving you more to go on than one that just says "oregano".
5. The softgel and other ingredients
Check what the oil is carried in. Many softgels are gelatin (from animals). Plant-based softgels use alternatives such as pectin, which is what ours use, so they're suitable for vegans. Also check for added carrier oils, colors, or fillers in the "other ingredients" line.
6. Testing: ask for a certificate of analysis
Labels are only as good as the testing behind them. In 2026, NOW Foods tested oregano oil supplements sold on Amazon and reported that about two-thirds failed potency testing (Vitamin Retailer; NutraIngredients).
A certificate of analysis (COA) is a lab report for a specific batch. A useful one shows:
- the batch or lot number (match it to the number on your bottle),
- the measured carvacrol content and the test method,
- contaminant screening, such as heavy metals and microbes,
- the lab's name and the test date.
Every Wellora batch is third-party tested, and we'll send you the report for your lot. Just email hello@wellora.us with the lot number from your bag.
How to compare two oil of oregano products
- Find the serving size and convert everything to the same basis (per serving or per day).
- Find the extract weight. Ignore the "equivalent" for comparison.
- Work out carvacrol in mg (extract × %).
- Divide the price by total carvacrol in the bottle to get cost per 100 mg of carvacrol.
- Check the species, softgel type, other ingredients, and whether the brand will show you a COA.
For ours: 240 mg × 90 servings = 21,600 mg of carvacrol per bag. At $44.45, that's about 21 cents per 100 mg of carvacrol (about 19 cents with Subscribe & Save).
Quick checklist
- Does the label give the extract weight and ratio, not just an "equivalent"?
- Can you work out carvacrol in mg?
- Is the serving size clear (per softgel vs. per serving)?
- Is the species named?
- What's the softgel made of?
- Will the brand show you a batch COA?
If you want a softgel that answers all six, here's ours. If you're comparing it with something else, use the steps above. We'd rather you buy the right product than ours by default.
Before you start any oregano supplement, read who should not take oil of oregano, and don't confuse supplements with aromatherapy bottles. Here's the difference between oil of oregano and oregano essential oil.
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. This article is for general information and isn't medical advice. Talk to your doctor or pharmacist before starting a supplement, especially if you're pregnant, breastfeeding, take medication, or have a health condition.