Undecylenic Acid

Dr. Sarah Mitchell
By Dr. Sarah Mitchell
Sep 21, 2026
1 min read

10-Undecenoic acid

Also known as: Calcium Undecylenate, 10-Undecenoic Acid, Undecenoic Acid

Undecylenic Acid is a castor oil derived fatty acid used topically and orally to support balanced fungal and yeast populations on the skin and within the digestive tract.

Undecylenic Acid

Explore Undecylenic Acid benefits and side effects, safe dosage recommendations, and top uses for gut balance and skin health.

Undecylenic Acid is an unsaturated fatty acid traditionally derived from the vacuum distillation of castor oil. It has long been recognized for its potent ability to help maintain a healthy microbial balance, particularly against various yeast and fungal organisms both inside the body and on the skin. Many individuals use it in oral supplement forms or topical formulations to support overall skin integrity, nail clarity, and gastrointestinal flora stability.

While Undecylenic Acid is widely available over the counter, understanding proper usage and potential Undecylenic Acid benefits and side effects is essential for safe outcomes. Individual responses can vary depending on whether it is ingested or applied topically. Because strong active compounds can interact with existing health conditions or medications, it is always advisable to consult a qualified healthcare professional before adding this supplement to your daily routine.

Undecylenic Acid Overview

Scientific Name
10-Undecenoic acid
Category
Omega & Fatty Acids
Key Compound
Undecylenic Acid
Used For
Fungal Balance, Skin Health, Gut Health
Available Forms
Oral Capsules, Topical Liquids, Ointments, Powders
Research Dosage
Typical oral supplementation ranges from 250 mg to 500 mg taken up to three times daily with food, while topical OTC solutions usually feature a 10% to 25% concentration applied twice daily.
Where It's Found
Derived from castor oil (Ricinus communis)

Undecylenic Acid Forms and Dosage Guidelines

Oral Capsules
Topical Liquids
Ointments
Powders

FORM TYPICAL DOSAGE RANGE
Oral Capsules (Calcium Undecylenate) 250 mg - 500 mg
Topical Solution / Liquid 10% to 25% concentration
Topical Ointment / Cream Thin layer application

Key Benefits of Undecylenic Acid

Undecylenic Acid

  • Supports a balanced microbial environment in the gastrointestinal tract
  • Promotes healthy yeast balance and helps prevent Candida overgrowth
  • Encourages clear, healthy skin and clear nail beds
  • Provides fatty acid protection against common external fungal irritants
  • Helps maintain skin barrier integrity when applied topically

Frequently Asked Questions

Undecylenic Acid is an unsaturated fatty acid traditionally obtained through the vacuum distillation of natural castor oil, which comes from the seeds of the Ricinus communis plant.

The main benefits include supporting intestinal yeast balance and protecting skin and nails against yeast overgrowth. Potential side effects are generally mild, such as stomach discomfort or nausea when taken orally, or temporary skin redness and itching when applied topically.

Yes, it is available in oral supplement forms, frequently bound with calcium as calcium undecylenate to make it gentler on the stomach. Always follow package directions or a physician's guidance.

Results vary based on the application method and individual health factors. Topical application for nails and skin may require several weeks of consistent use, while gut balance benefits may be noticed within several days to weeks.

Topical formulations should not be applied to open wounds or severe burns. For oral use, individuals with sensitive digestive systems should start with lower amounts and consult a doctor before beginning supplementation.