Science
Mechanism of Action
This extract acts through several pathways to enhance skin health. It provides antioxidant defense, shielding the skin from environmental stressors. Its astringent qualities contribute to refined pores and an improved surface texture. The extract also calms irritation and redness via anti-inflammatory effects and offers broad-spectrum antimicrobial activity against bacteria like S. aureus and E. coli, which can contribute to acne. Crucially, its high silica content is vital for boosting collagen production and cross-linking, thereby enhancing skin elasticity, firmness, and reducing the appearance of wrinkles. It actively promotes skin regeneration, accelerating wound healing by stimulating cell proliferation and decreasing scar tissue formation. Furthermore, components like Vitamin B5 aid in skin hydration by acting as a humectant, supporting moisture retention and overall skin clarity.
Research
Clinical Evidence
Medium confidence3%
Key findings
- 01 Topical application of 40% Equisetum hyemale ethanolic extract accelerated wound healing in diabetic rats, enhancing fibroblast collagen synthesis, modulating cytokines (increasing IL-10, inhibiting MCP-1), and demonstrating antibacterial efficacy against Staphylococcus aureus and Escherichia coli.
- 02 For optimal results in moisturizing and anti-aging cosmetic formulations, a concentration range of 2-5% is recommended for Horsetail extract (Equisetum arvense extract).
Transparency
Dusting Analysis
While 2-5% is generally recommended for optimal cosmetic results in anti-aging and moisturizing products (referencing Equisetum arvense, often grouped with E. hyemale), the Cosmetic Ingredient Review (CIR) Panel advises a maximum safe use concentration of 0.4% in leave-on products. This notable disparity suggests that formulations claiming significant efficacy at concentrations below 2.0% might be using the ingredient for 'dusting' purposes, potentially offering minimal active benefits.
The Formula
Formulation
Stability
For optimal stability, it is advisable to incorporate the extract into an emulsion during the cool-down phase or directly into the water phase if employing cold-processing methods. The stability of its bioactive components is susceptible to environmental factors such as pH fluctuations, temperature variations, light exposure, oxygen, and the presence of metal ions. While the crystalline structure of Equisetum hyemale suggests inherent stability and potential for high bioavailability, further experimental validation is needed.
Safety
Safety Profile
The Expert Panel for Cosmetic Ingredient Safety (CIR) deemed Equisetum arvense-derived ingredients (often broadly encompassing horsetail extracts) safe for cosmetic use within current practice and concentrations, specifically up to 0.4% in leave-on products. It is generally regarded as non-toxic and non-comedogenic, with a low risk of irritation. However, undiluted forms can be potent, and mild irritation or allergic reactions are possible in sensitive individuals, warranting a patch test prior to extensive application. A study noted Equisetum arvense extract (in butylene glycol) caused slight irritation but no sensitization.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Equisetum hyemale extract is a valuable multi-functional ingredient known for its potent antioxidant, anti-inflammatory, and collagen-boosting properties, supporting skin regeneration and clarity across various skin types.
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References
Sources