Undecylenic acid is an unsaturated fatty acid that has been studied for its antifungal properties, especially against yeasts such as Candida but also other fungi. It helps inhibit fungal growth and supports a more favorable microbial balance. It is considered to be more potent than caprylic acid.
Common uses for Undecylenic Acid
Fungal infections
- Skin fungus (e.g., athlete’s foot/tinea pedis, nail fungus)
- Yeast infections (Candida in the gut, mouth, or vagina)
- Skin-related fungal infections (ringworm, tinea corporis)
Skincare and cosmetics
- Included in certain antifungal creams and body washes
- Used for acne (partly by balancing the skin’s microbiome)
- May be included in beauty products to counter fungus-related skin conditions (e.g., seborrheic dermatitis, rosacea)
Undecylenic acid – quality can vary
Better protection against oxidation (crucial for undecylenic acid)
Undecylenic acid is an unsaturated fatty acid that is sensitive to oxidation. Greatlife’s Undecylenic Acid has antioxidant protection that provides higher stability, longer shelf life, and preserved biological activity. D-alpha-tocopherol (vitamin E) functions as a powerful lipid-soluble antioxidant that protects undecylenic acid from oxidizing. Rosemary extract contains natural polyphenols (e.g., carnosol, rosmarinic acid) that further stabilize fatty acids.
More stable oil base for the active substance
In Greatlife’s Undecylenic Acid, the oil is used together with antioxidants, making it an active carrier, not just a filler. It protects, stabilizes, and helps deliver the undecylenic acid in a more intact and effective state. In simpler formulations without antioxidants, the oil primarily acts as a passive filler, whereas in this composition it directly contributes to the product’s quality, shelf life, and function. This reduces the risk of rancidity and quality degradation over time. The undecylenic acid remains chemically intact and effective for longer.
Less water = better for a fatty acid
Undecylenic Acid from Thorne contains purified water in the capsule material. Water increases the risk of:
- hydrolytic degradation
- microbial instability
- deteriorating fatty-acid quality over time
Undecylenic Acid from Greatlife:
- uses vegetable glycerin with no added water in the fill
- provides a drier, more stable environment for the undecylenic acid
This is important for a fat-based, antifungal compound.
Better tolerance and topical use
Undecylenic acid is often used internally and externally (topically for nail fungus). Undecylenic Acid from Greatlife contains skin-friendly lipids in the form of extra virgin olive oil, complemented by fat-soluble antioxidants that contribute to stability and good tolerance, even for topical use. It is more suitable for topical application when needed than Undecylenic Acid from other brands.
Fewer capsules yet a higher dose
To reach 1000 mg of undecylenic acid, you have to take 20 softgels of Thorne Sf722 whereas 4 softgels of Greatlife’s Undecylenic Acid are enough.
Functional quality
For Undecylenic Acid from Greatlife we have:
- considered fatty-acid chemistry
- focused on stability and bioactivity
- formulated primarily for function, not just contents
Undecylenic Acid from Thorne is functional but more basic than Undecylenic Acid from Greatlife, which is a more premium product.
