Is Your Favorite Coffee Mold-Free? Here’s What the Science Actually Says
Learn what mold-free coffee means and whether or not this new wellness trend is worth paying attention to.
If you’re asking the question: “Is my coffee mold-free?” you’re in the right place.
Maybe you’re part of the clean coffee movement and want to make sure you’re getting a premium cup.
Perhaps you’ve heard whispers about coffee mold and are wondering what it’s all about.
Well, we here at Aethereal Coffee love to educate our customers (and the world!) about getting a healthy cup of coffee that’s mold-free, tastes great, and enhances your life.
That’s why we wrote this blog.
Whether you’re looking to elevate your brew or get information about mold-free coffee, we’re here to help you understand what mold-free coffee actually means and give you the information to make smart coffee buying decisions.
We should mention that our coffee was tested in the lab for mold, and it passed with flying colors.
Now, we want to pass on what we’ve learned about coffee mold to you. Let’s dive in.
What is "Coffee Mold” Anyway?
You’ve probably never opened a bag of coffee beans to find the type of fuzzy gray mold that grows on a forgotten strawberry or a cherry tomato.
Mold like that can only grow on damp beans—and most beans are dry.
So what does coffee mold mean, then?
When people talk about coffee mold, what they’re actually talking about is mycotoxins.
According to the Cleveland Clinic, “Mycotoxins are products of certain fungi and molds that can cause illness in animals and people,” and exposure can lead to flu-like symptoms or more serious complications. [1]
In other words, these microscopic mycotoxins can be present without visible mold.
Mycotoxins can grow on coffee, but are more commonly found in other types of foods we eat.
According to the National Library of Medicine [2], crops that are the most vulnerable to mycotoxins are:
Maize
Millet
Wheat
Sorgum
Soybean
Peanuts
The reality is that mold is a fundamental part of our ecosystem, and while some are dangerous, our global food systems are built to manage them.
In fact, most national and store brands utilize laboratory testing to ensure mycotoxin levels stay within safe limits. However, the primary line of defense is actually moisture control, as mold physically cannot grow or produce toxins without a specific amount of water.
When it comes to coffee beans, you can do your part by storing them—and other foods—in a clean, dry area. It’s also a good idea to never eat coffee beans or beverages that look moldy.
Mycotoxins and Coffee Mold
Now that you know what mycotoxins are and the ways you can keep yourself safe, let’s talk about how mycotoxins affect coffee beans.
First off, yes: There is evidence that mycotoxins exist in all foods, including coffee beans, but how worried you should be about them is a decision only you can make.
Here are 5 data points that might help you gauge how you feel about mycotoxins:
Most Coffee is "Clean" Before it reaches the Roaster
Research on green coffee beans shows that while mold spores are common in nature, only about 33% of samples contained actual mycotoxins, and nearly all were well within safe global health limits. [3]Roasting Destroys Up to 90% of Toxins
The high heat of the roasting process is your best safety filter. Studies show that roasting beans at standard temperatures reduces mycotoxin levels by 42% to 90%, effectively "cleaning" the beans before they ever hit the grinder. [4]Brewing Acts as a Final Safety Barrier:
Even if trace amounts of toxins exist in a roasted bean, they don’t always end up in your cup. One study done in Portugal found that only 18% of final brews contained detectable levels of mycotoxins, as the brewing process itself filters out much of the residue.[4]Decaf Beans Require Extra Care:
The science shows that decaffeinated green beans can sometimes have higher toxin levels (Aflatoxins) than regular beans. This is due to the extra moisture used during the caffeine extraction process. [5]Coffee is Often "Cleaner" Than Your Spice Rack
To put the "mold" concern in perspective, researchers found that common kitchen staples like chili powder often contain significantly higher concentrations of mycotoxins than the average bag of roasted coffee. [6]
So yes, there is mold.
But no, according to scientists, with some basic maintenance and common sense, you don’t need to worry too much about it. However, if you’re looking for an exceptionally clean cup, there are extra steps you can take.
How To Find Mold-Free Coffee Brands
If you want the absolute “for-sure” way to know your coffee is safe, there are more steps you can take to reduce your risk of exposure to mycotoxins and mold.
Stick with Specialty Grade Arabica: As the Portugal study shows, high-altitude Arabica beans are naturally less prone to mold than mass-produced Robusta (plus, Arabica beans are known for their superior flavor.)
Look for "Washed" or "Wet-Processed": This method removes the fruit and sugars early, which significantly lowers the chance of fungi growing during the drying phase.
Check for the Lab Results: Don't just take a brand's word for it. Look for companies (like us!) that actually put their beans through lab testing to verify they are below detectable levels or within the safe range of the presence of mold.
Once you find a brand that has tested its coffee, you can even go a step further and ask for the details. Here are the three main things to look for:
A Certificate of Analysis (COA): This is the official document from a laboratory verifying the purity of a specific batch. If a brand is truly testing their coffee, they should have this report ready to share.
"Non-Detectable" Limits: Look for the notation "ND" on the report. This means that any presence of toxins is so infinitesimal that the high-tech laboratory equipment couldn't even find them.
Third-Party Verification: Ensure the testing was done off-site and not “in-house.” Independent, third-party labs provide the objective, unbiased safety seal you deserve.
If you’re worried about mold, there are companies out there that are going the extra mile to ensure you stay safe, and we’re proud to be one of them.
Get Some Mold-Free Peace of Mind With Every Pour
Now that you know what mycotoxins are, how they affect coffee mold, and how roasting adds a layer of protection in prevention.
You also learned why looking for a 3rd party mold tested coffee brand is the pinnacle of safety.
Here at Aethereal Coffee, we’ve done the heavy lifting:
Our importer tests the coffee once it arrives at their warehouse in the United States. Plus, after we receive it, we test it again via a third party to double-check.
Not to mention, we’re organic, fair trade, and regularly win International roasting awards. Just sayin’. 😉
Ready to try it for yourself?
Disclaimer: The information provided in this article is for educational and informational purposes only and is not intended as medical or health advice. While we strive to provide accurate, up-to-date scientific information, you should always consult with a qualified healthcare professional before making changes to your diet or health routine. References to "mold-free" or lab-tested results apply specifically to tested batches and do not constitute a medical guarantee of health benefits.
