Manufactured Citric Acid: What You Need to Know

by | Feb 2, 2025

When you see “citric acid” on a food label, you might assume it’s from natural sources like lemons and limes.

Aspergillus niger (black mold) – magnified

However, most citric acid used in processed foods and beverages is manufactured citric acid (MCA)—a synthetic version produced using Aspergillus niger, a strain of black mold.

You read that right – black mold.

While food manufacturers insist MCA is safe, emerging research suggests it may contribute to inflammation, joint pain, and digestive issues in some individuals.

What is Manufactured Citric Acid (MCA)?

Citric acid naturally occurs in citrus fruits, giving them their tart taste.

But producing citric acid from fruit is expensive, so in 1919, food manufacturers discovered a cheaper method: fermenting sugars with Aspergillus niger.

This mold-based fermentation process produces MCA, which is then added to countless foods, beverages, and supplements.

MCA is used for preserving freshness, enhancing flavors, and adjusting acidity in processed foods.

While its molecular structure is the same as natural citric acid, MCA may contain residual mold proteins or other byproducts that could trigger inflammation in sensitive individuals​.

Potential Health Concerns of Manufactured Citric Acid

A study published in Toxicology Reports examined four individuals who experienced significant inflammatory reactions after consuming foods containing MCA​.

Link to study

Their symptoms included:
Joint pain and swelling
Fatigue and brain fog
Digestive issues like bloating and cramps
Respiratory symptoms

These individuals noticed immediate symptom relief after removing MCA from their diets.

While more research is needed, this study raises concerns about whether long-term, repeated exposure to MCA could trigger chronic inflammation in some people.

How to Avoid Manufactured Citric Acid in Your Diet

Since food labels don’t distinguish between natural and manufactured citric acid, you must assume that all listed “citric acid” is the manufactured version.

Here are some common foods that often contain MCA:
🚨 Jarred pasta sauces (except brands like Rao’s)
🚨 Canned beans (except brands like some of the Whole Foods 365 line of canned beans)
🚨 Electrolyte powders and flavored waters
🚨 Canned sodas and energy drinks
🚨 Prepackaged hummus and dressings

Jarred tomato product – Most likely contains Manufactured Citric Acid (MCA) that is grown on black mold (Aspergillus niger)

Better Alternatives to Citric Acid-Containing Foods

Instead of consuming foods with MCA, opt for brands that avoid it.

Here are a few examples:
Pasta Sauce: Rao’s (does not list citric acid on label)
Canned Tomatoes: Cento brand (Italy-produced versions do not list citric acid)
Canned Beans: Whole Foods 365 and Trader Joe’s (they do not list citric acid)

When grocery shopping, read ingredient labels carefully and choose foods with simple, recognizable ingredients.

Fresh, whole foods are always a great option.

Final Thoughts

While not everyone reacts negatively to manufactured citric acid, it’s important to be informed about what you’re putting in your body.

If you struggle with inflammation, joint pain, or unexplained digestive issues, consider eliminating MCA for a few weeks and observing how you feel.

Small dietary changes can have a big impact on your health.

By choosing whole, minimally processed foods, you can reduce exposure to questionable additives and support your body’s ability to heal and thrive.

I’m curious – leave a comment if you were already aware of this or if this is new news for you.

-Caitlin

I’ve found an approach to healing after the diagnosis that is life changing.

This transformed my life and I want to share it with you, too.

Are you ready to feel more empowered?

Order supplements through my Fullscript store.

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