Mold in Coffee? The Harsh Truth About Coffee Mycotoxins

Can coffee contain mold? Yes. Coffee can develop mold — and the mycotoxins certain molds produce, most commonly ochratoxin A and aflatoxins — at several points between the farm and your cup. For most people drinking quality coffee, the levels are low and considered safe by food-safety regulators. But mycotoxins are real, they’re regulated for a reason, and if you want to minimize your exposure, the most reliable safeguard is simple: choose coffee that’s been independently lab-tested.

According to the World Health Organization, mycotoxins can pose health risks with high, long-term exposure. The concerns most often linked to them include:

• ▸ Immune-system effects
• ▸ A severe onset of allergies in sensitive people
• ▸ Poisoning at high doses
• ▸ In high, prolonged exposure, certain mycotoxins are classified as possible carcinogens

Sounds alarming? Here are a few moldy-coffee truths — with the important context most articles skip:

• ☕ Studies have detected ochratoxin A in roughly 45% of commercially available beans (source).
• ☕ Aflatoxins have been found in a portion of green coffee beans (source).
• ☕ Roasting helps reduce toxins, yet about a quarter (27%) of roasted coffees still showed ochratoxin A (source).

Important context: detection is not the same as a harmful dose. Much of what these studies detect is at trace levels, and coffee meeting regulatory limits is generally considered safe. The real safeguard isn’t fear — it’s knowing your coffee was tested.

So how can you make sure you’re not drinking moldy coffee?

First: why is there mold in coffee?

The journey from crop to cup is a long one, and mold can take hold at several stages. Here’s a quick summary of what affects mold growth in coffee.

The climate of coffee-growing regions

Coffee grows in warm, tropical climates. Heat plus humidity naturally raises the risk of mold growth if beans aren’t handled and dried properly.

“From processing to shipping to storing coffee at home: things can get moldy at any step of the way.”

Coffee processing and mold risk

Removing the cherry’s outer mucilage (washed processing) requires careful drying — beans that aren’t dried thoroughly can become a perfect growth spot for mold. Natural (dry) processing leaves the pulp on longer to dry, which can raise the risk further if it isn’t managed well.

Mold risk during shipping of green coffee beans

Most green coffee travels for weeks in shipping containers, packed in burlap sacks made of jute — essentially cellulose, a natural fiber mold readily grows on. Swings in temperature and humidity during that journey can encourage mold. (Thankfully, our coffee is roasted closer to origin, so it spends less time as vulnerable green beans in transit.)

Mold in coffee during roasting

Mold isn’t only a green-bean issue. There are multiple steps when roasting the beans, and warm temperatures with little airflow can give mold the conditions to multiply.

But the presence of mold spores isn’t automatically a health issue — not all mold is harmful. The concern is the small group of molds that produce mycotoxins.

What are coffee mycotoxins?

Mycotoxins are toxic byproducts of certain molds. Scientists have identified hundreds, but two matter most for coffee:

• ✗ Aflatoxins. Produced mainly by Aspergillus molds, they’re among the most studied mycotoxins and are tightly regulated in foods worldwide.
• ✗ Ochratoxin A (OTA). The mycotoxin most associated with coffee. It’s the more stubborn one because, unlike some others, OTA is only partially reduced by roasting.

“Because ochratoxin A is only partially reduced by roasting, testing the finished coffee — not just trusting the roast — is what actually confirms a clean cup.”

Mold in coffee: symptoms & what to know

Drinking a normal cup of quality coffee isn’t expected to cause symptoms. However, consuming coffee that is visibly moldy or spoiled — or being sensitive to mold — may be associated with reactions such as:

• Headache
• Dizziness
• Digestive upset or nausea
• Allergy-type symptoms in sensitive individuals

These effects are most associated with mold sensitivities or clearly spoiled coffee, and for most people they’re short-lived. If you experience persistent or severe symptoms, stop drinking the coffee and consult a healthcare professional.

Can mold make your stomach hurt?

Digestive discomfort can follow drinking spoiled or moldy coffee and is often eased with over-the-counter remedies for nausea or stomach upset. If you know you’re sensitive or allergic to mold, it’s best to seek medical advice.

Drink coffee & stay confident: how to make sure your cup is mold-free

1. Choose high-altitude coffee beans

Single-origin beans grown at high altitudes tend to face fewer pests and lower contamination pressure, so they generally carry fewer contaminants than low-grown coffee.

2. Favor well-processed, properly dried coffee

Carefully washed, sun-dried coffees have been shown to carry fewer mycotoxins than poorly handled ones — a good signal of quality.

3. Opt for hand-picked, hand-processed coffees

No machine beats the diligent eye of a skilled farmer. Carefully hand-turned and hand-dried coffee tends to be cleaner than commercial, machine-processed lots.

But is organic coffee mold-free by default? Not necessarily — organic refers to how coffee is grown, not whether it contains mold. Which brings us to the one method that removes all doubt.

The only way to be 100% certain there’s zero mold in your coffee…

Certification. You’d be surprised how many coffee producers never test their coffee at all — which is exactly why so few truly mycotoxin-tested brands exist.

A credible lab report should come from an independent lab and clearly state:

• The testing date
• The lab and specialist who conducted the tests
• The list of mycotoxins tested
• The testing method used
• The value obtained and the limit of detection (LOD)

When a result reads below the LOD (shown with a “<” symbol), the mycotoxin is present at a level too low to detect. If every toxin listed reads below the LOD, you can brew your mold- and mycotoxin-tested coffee with total confidence.

The benefits of choosing coffee tested for mold & mycotoxins

All our coffees are tested for mycotoxins and pesticides by independent third-party labs.

An invitation to dig deeper into a toxin-free life with our fan

Toxins in food and consumer products are a real concern, and many people assume regulators have it all covered. Not always — which is why being able to see a coffee’s test results matters.

Meet Dawn Marone, a toxin-free living advocate and longtime Spirit Origin Coffee fan, who shares why reducing everyday toxins became a personal mission.

“Nine years ago, I was diagnosed with breast cancer at age 42. I was the first person in my family to have BC, so I wasn’t surprised when the genetic testing came back negative. My breast cancer came with loads of complications, so for the next several years, that was my focus.

My oldest daughter ended up having a baby in 2015. With the internet at her disposal, she learned all about toxins and started her toxin-free journey. As she got deeper into her journey, she started working on me. I can’t recall how many times I heard, ‘Mom! you had breast cancer… it was environmentally driven… you’ve got to make better choices!’

She also recommended a couple of movies, ‘The Devil You Know’ being one of them. Honestly, that’s when my eyes started to open up…

So I decided to listen to my daughter and swap some of my toxic products for safe alternatives.

One of the first swaps I made was my hair care because I’ve had issues with my hair falling out ever since I got pregnant with my daughter 25 years ago. Within 3 days of using toxin-free shampoo, my hair stopped falling out. I will never forget standing in the shower, washing my hair, with only a couple of strands in my hands!! I would normally have to rinse my hands to get all the hair off.

Alarm bells were going off, and I was finally listening.”

Dawn has been living a toxin-free life ever since. She created a Facebook group where she shares ingredient education and clean-product swaps, and Spirit Origin Coffee is one of her favorites.

Mold in Coffee FAQ

This article is for general informational purposes only and is not medical advice. If you have specific health concerns, please consult a qualified healthcare professional.