Grains: The Dietary Source of Azelaic Acid
Azelaic acid is a naturally occurring compound found in several types of cereal grains, including wheat, rye, and barley. These whole grains contain the dicarboxylic acid in small amounts, which are released and absorbed during the digestive process. While consuming these grains can contribute to overall health, the concentration of azelaic acid is minimal and not high enough to have a therapeutic effect on skin conditions like acne or rosacea. Laboratory studies have successfully extracted azelaic acid from these grains, demonstrating their natural presence, but the extraction process is complex and the yield is low.
The Role of Whole Grains
For the average person looking to incorporate more wholesome, nutrient-dense foods into their diet, adding whole grains like barley and rye is beneficial for many reasons beyond their minimal azelaic acid content. These grains are rich in fiber, vitamins, and minerals that support overall health, including skin health. However, relying on dietary grains to treat specific skin concerns that require a high concentration of azelaic acid is impractical. Topical formulations, which typically contain between 10% and 20% azelaic acid, are derived from synthetic processes to ensure potency and stability, not from natural grain extracts.
The Skin's Own Producer: Malassezia furfur
Another significant natural source of azelaic acid is the yeast Malassezia furfur, which is a normal part of the human skin microbiome. This fungus naturally produces azelaic acid as a metabolic byproduct, converting fatty acids into dicarboxylic acids. This discovery occurred in the 1970s when it was noticed that the yeast could cause hypopigmentation (lighter patches of skin) in pityriasis versicolor patients. Further research revealed that the yeast's production of azelaic acid was responsible for inhibiting the activity of tyrosinase, the enzyme that produces melanin.
How Malassezia Affects Skin Health
The natural production of azelaic acid by Malassezia furfur is a key part of its complex relationship with human skin. The acid's ability to inhibit tyrosinase is why some fungal-related skin conditions show changes in pigmentation. While this is a fascinating biological process, it is not a practical way to harness azelaic acid for skincare purposes. The amount produced by the yeast varies and cannot be controlled or concentrated effectively for clinical use. Furthermore, an overgrowth of Malassezia furfur is associated with conditions like dandruff and fungal acne, underscoring why it is not a reliable source for skincare.
Natural vs. Synthetic Azelaic Acid
For medical and cosmetic applications, azelaic acid is produced synthetically in a lab. This ensures a high level of purity, stability, and effectiveness that would be impossible to achieve through natural extraction from grains or skin yeast. The synthetic manufacturing process, often through the ozonolysis of oleic acid, allows for precise concentration levels (such as 10%, 15%, or 20%) needed to treat specific dermatological conditions. Relying on natural sources for therapeutic levels would be both impractical and ineffective.
Why Synthetic Production is Necessary
- Potency and Concentration: For conditions like acne and rosacea, a specific, potent concentration of azelaic acid is required. These concentrations are far higher than what is found naturally in grains.
- Stability: Synthetically derived azelaic acid is more stable, allowing it to be formulated into consistent creams, gels, and serums that have a predictable shelf life.
- Efficacy: The controlled, synthetic process guarantees a consistent, high-quality ingredient. Natural extracts, on the other hand, can vary in potency depending on the source and extraction method.
Comparison of Azelaic Acid Sources
| Feature | Grains (Wheat, Barley, Rye) | Skin Yeast (Malassezia furfur) | Synthetic (Commercial Products) |
|---|---|---|---|
| Availability | Abundant in common foods | Naturally on all human skin | Widely available in topical creams, gels, and serums |
| Concentration | Very low, trace amounts | Variable, not quantifiable | Precise, high concentrations (10-20%) |
| Therapeutic Effect | None, for treating skin conditions | None, not a practical source | Significant, well-documented efficacy |
| Purity | Mixed with other grain compounds | Mixed with skin oils and other yeast metabolites | High purity, consistent ingredient |
| Application | Ingested via diet, no topical use | Naturally present, but unreliably produced | Topically applied for targeted skin benefits |
| Production Method | Plant metabolism | Fungal metabolism | Industrial chemical synthesis |
Conclusion
While azelaic acid is found naturally in grains like wheat and barley and produced by yeast on the skin, these sources are not practical for therapeutic use. The concentrations present in nature are simply too low and inconsistent to effectively treat skin conditions such as acne, rosacea, or hyperpigmentation. For reliable, potent, and safe application, commercially available skincare products containing synthetically produced azelaic acid are the established standard. This manufacturing method ensures the ingredient is effective, stable, and delivers the consistent results that natural sources cannot. When searching for azelaic acid products, look for formulations with a precise concentration, typically between 10% and 20%, rather than relying on natural dietary intake for skincare benefits.
Visit the Cureus Journal website for an in-depth review of azelaic acid's mechanisms of action.