Antifungal
Undecylenic Acid
Also known as: 10-Undecenoic Acid, Undecenoic Acid, Undecylenic acid, 10-Undecenoic acid
Natural antifungal fatty acid derived from castor oil. Used to support healthy gut flora and combat candida overgrowth.
Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.
Primary uses
- Antifungal support
- Candida overgrowth
- Gut health
How it works
- Disrupts fungal cell membranes
- Inhibits fungal growth
Dosage
- Typical range
- 150-500 mg daily
- Timing
- With meals
- With food
- Yes
- Duration
- 2-4 weeks typical course
- Special populations
- Generally safe for adults
Forms
- Calcium undecylenate
- Free acid
Safety
Common side effects
- GI upset at high doses
Contraindications
- None known
Products containing Undecylenic Acid
Top-scoring supplements in our catalog that list Undecylenic Acid on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.
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Evidence notes
Traditional use with limited clinical trials
Grade C: Mostly observational or small trials; mechanism is plausible but unproven at scale.
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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.