Cinnamon’s Secret: The Science of Hair Growth

Cinnamon and Hair Growth: A Scientific Examination

Unraveling the Potential of Cinnamic Acid in Hair Growth: A Scientific Perspective

3 min readApr 2, 2024

Hair growth is a complex process influenced by various factors, including genetics, hormones, diet, and environmental factors. The hair follicle, a skin appendage, regulates body temperature and safeguards vulnerable areas [8]. Hair disorders can significantly impact well-being and quality of life [8]. Recently, a study claimed that cinnamic acid, a derivative of cinnamon bark, could promote hair growth and relieve alopecia patients. This paper aims to examine the validity of this claim and understand the science behind hair growth and the role of cinnamon.

Hair Growth: The Science

Hair growth is the result of the growth and differentiation of hair follicles (HFs) comprising dermal papilla cells (DPCs) and epithelial cells [8]. The formation of HF involves four cycles: anagen (growth), catagen (regression), telogen (rest), and exogen (shedding) [8]. The hair cycle transition is controlled by several growth stimulatory or inhibitory factors [8]. Hair loss can occur when hair follicles don’t get enough blood flow, as they need blood and nutrients to support hair growth [5].

Cinnamon and Hair Growth

Cinnamon has been used since ancient times for various health benefits. Recent research suggests that cinnamon, specifically cinnamic acid, may have potential benefits for hair growth [13] [14] [16]. Cinnamic acid, a small molecule activator for oxytocin receptor (OXTR) expression, led to the upregulation of OXTR and trichogenic gene expression in human DP cells [13] [14]. This suggests that cinnamic acid enhances the hair growth ability of DP cells via oxytocin signaling [13] [14].

In an animal study, cinnamon oil improved hair length in male rats and was as effective as 2 percent topical minoxidil (Rogaine) [16]. This effect is due to cinnamaldehyde, the main compound in cinnamon, which increases circulation and blood flow to the hair follicles, supporting hair growth [16].

Validity of the Claim

The claim that cinnamic acid promotes hair growth by 25 percent is supported by scientific studies [13] [14] [16]. However, it’s important to note that these studies are preliminary, and more research is needed to fully understand the effects of cinnamic acid on hair growth, especially in humans.

While preliminary research supports the claim that cinnamic acid can boost hair growth, more comprehensive studies are needed to confirm these findings and understand the underlying mechanisms. As with any potential treatment, it’s essential to consider the safety and efficacy of cinnamic acid for hair growth. Future research should focus on human clinical trials to validate these promising results.

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