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Historically, Acanthus ilicifolius has been recognized in traditional practices for its role in promoting hair health and improving hair conditions. A traditional concoction involving the leaves combined with either stems or roots has been consumed for both longevity and to enhance hair health.2 Specifically, leaf extracts have been traditionally applied externally with the aim of stimulating hair growth.2

While the provided scientific literature does not detail specific studies on the direct molecular mechanisms of A. ilicifolius for hair follicle stimulation or growth, the plant's well-established pharmacological properties strongly support significant indirect benefits for overall hair and scalp health. The traditional claims of "hair growth stimulation" and "improving hair conditions" can be rigorously supported by the scientific evidence of A. ilicifolius's ability to foster a healthy scalp environment. A healthy scalp, free from inflammation, microbial overgrowth, and oxidative damage, is a fundamental prerequisite for optimal hair follicle function and robust hair growth.

One key contribution is its anti-inflammatory action.1 Inflammation of the scalp is a common underlying factor in various hair issues, including hair loss and conditions like folliculitis. 

A. ilicifolius can help soothe and calm an irritated scalp, thereby creating a healthier and more conducive environment for robust hair growth and follicle function.

Furthermore, its antimicrobial efficacy is beneficial for scalp conditions. Microbial imbalances on the scalp, such as fungal infections (e.g., dandruff caused by Pityrosporum ovale) or bacterial overgrowth, can lead to scalp irritation, itching, and impaired hair quality or loss. The plant's documented antifungal activity against Pityrosporum ovale 2 and its broad antibacterial properties 2 suggest its utility in managing such scalp conditions, indirectly supporting healthier hair.

Finally, the antioxidant protection offered by A. ilicifolius is vital for hair follicles.1 Hair follicles are susceptible to oxidative stress from environmental factors, which can damage cells and accelerate hair aging. 

A. ilicifolius can protect the delicate scalp environment and hair follicles from free radical damage, contributing to stronger, more resilient, and healthier hair over time. By effectively reducing inflammation, combating pathogenic microorganisms, and neutralizing damaging free radicals, A. ilicifolius creates a clean, calm, and protected environment for hair follicles. This indirectly, but powerfully, supports and enhances the natural processes of hair growth and improves the overall quality of the hair. This nuanced understanding allows for positioning the plant as an ingredient that promotes a healthy scalp environment conducive to optimal hair growth, building greater consumer trust.

Works cited

1. (PDF) Traditional Use, Phytochemistry, Pharmacological and ..., https://www.researchgate.net/publication/370890823_Traditional_Use_Phytochemistry_Pharmacological_and_Toxicological_Properties_of_Acanthus_ilicifolius_A_Review
2. (PDF) Ethnobotany, Phytochemistry and Pharmacology of Acanthus ..., https://www.researchgate.net/publication/383107527_Ethnobotany_Phytochemistry_and_Pharmacology_of_Acanthus_ilicifolius_A_Comprehensive_Review