Cinnamomum Cassia Bark
INCI: CINNAMOMUM CASSIA BARK
Reviewed by Daisy · Last updated 14 Aug 2026
A botanical extract traditionally used to support skin barrier function and resilience
Best For Skin Types
All, Sensitive
Addresses
Usage Frequency
Daily
What Is Cinnamomum Cassia Bark?
Cinnamomum cassia bark, commonly known as cinnamon, is derived from the inner bark of the cinnamon tree. In skincare formulations, it typically appears as an extract or essential oil component, where it functions as a skin conditioning agent. The ingredient has a long history in Traditional Chinese Medicine and is now being investigated for its potential effects on skin barrier health.
The bark contains active compounds including cinnamaldehyde and cinnamyl alcohol, which are believed to be responsible for its biological activity. In cosmetic products, it is used in very small concentrations (typically under 0.1%) to support skin conditioning rather than as a primary active ingredient.
How It Works
The mechanism appears to involve activation of the p38 MAPK pathway, a cellular signalling system that influences how skin cells differentiate and mature. This process may be particularly relevant to barrier function, which naturally follows circadian rhythms—meaning the skin's repair capacity varies throughout the day.
Animal model research has also shown that certain preparations of cinnamomum cassia bark may modulate immune responses in the skin, including reducing the activity of enzymes and cytokines associated with inflammatory skin conditions. However, the relevance of these findings to human skin requires further investigation.
Clinical Evidence & References
Preliminary research is promising but still limited. In controlled laboratory and animal studies, cinnamomum cassia bark extract has demonstrated effects on barrier function markers and inflammatory mediators. One animal study showed significant reduction in inflammatory markers associated with atopic-type responses, though human clinical data remains sparse.
Most studies to date have used concentrated extracts at levels higher than those typically found in skincare products. The real-world efficacy of the small concentrations used in cosmetics remains uncertain, and more human trials would be needed to establish clear benefits for specific skin concerns.
Published Research
How to Use
As cinnamomum cassia bark is used in very low concentrations in skincare, it is best considered a supporting ingredient rather than a primary active. Include it as part of a well-formulated skincare routine alongside other evidence-backed ingredients tailored to your specific concerns. There is no evidence that higher concentrations would be more effective; formulations are carefully balanced for both efficacy and safety.
Safety & Precautions
Frequently Asked Questions
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Take the skin quizOther forms of Cinnamomum Cassia Bark
These appear on ingredients lists under different names but are the same substance. Cinnamomum Cassia Bark is the common form.
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