Science
Mechanism of Action
This extract influences skin health through several distinct pathways. Its bioactive compounds effectively suppress macrophage activation and attenuate the expression of inflammatory cytokines such as IL-6 and TNF-α, which contributes to anti-acne effects. In the context of inflammatory skin conditions like atopic dermatitis, it modulates calcium channels by inhibiting Orai-1 activity to reduce T-cell activation, and simultaneously activating TRPV3 channels to promote skin barrier repair. It also stabilizes mast cells by decreasing β-hexosaminidase release. Furthermore, the extract exhibits notable antioxidant potential and, in vitro, has demonstrated a complex, concentration-dependent regulation of tyrosinase activity, potentially influencing melanin production.
Research
Clinical Evidence
Low confidence1%
Key findings
- 01 Topical application of a 1% Tribulus Terrestris fruit extract, in combination with 0.1% hydrocortisone, significantly alleviated key symptoms of oxazolone-induced atopic dermatitis in a murine model. Observed improvements included reduced skin erythema, edema, epidermal hyperplasia, and transepidermal water loss (TEWL), along with a decrease in symptom scores. This efficacy was linked to the extract's ability to modulate calcium channels (inhibiting Orai-1 activity and increasing TRPV3 activity) and stabilize mast cells (reducing β-hexosaminidase release).
- 02 An in vitro study indicated that a Tribulus Terrestris decoction could exhibit bidirectional regulation of tyrosinase activity. It appeared to enhance tyrosinase activity at a higher concentration (100 mg/mL) but inhibit it at a lower concentration (10 mg/mL). This complex response requires stringent further validation.
Transparency
Dusting Analysis
While a 1% concentration demonstrated significant efficacy in an animal model, there is currently insufficient human clinical data to establish a definitive 'dusting' threshold or identify commonly underdosed percentages for topical application in general cosmetic formulations.
The Formula
Formulation
Stability
The extract has shown stability at pH 7.4 in specific experimental solutions, such as Krebs-Henseleit. However, a general optimal pH range for its stability in cosmetic formulations is not well-documented. Formulators should be aware that the composition and biological properties of Tribulus Terrestris extracts can vary significantly due to a lack of standardization. Certain extracts have demonstrated cytotoxicity to fibroblast cultures at higher concentrations (e.g., 75-150 µg/ml), although others were found to be less toxic at 100 µg/ml.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) has not specifically evaluated Tribulus Terrestris Extract. The FDA considers Tribulus Terrestris as a plant/plant extract used in some over-the-counter products, but it is not classified as an approved drug. The FDA has issued warnings regarding the quality and safety of unregistered 'Tribulus Terrestris Herbal Food Supplement' products, highlighting the need for evaluation. However, the extract is not listed among ingredients prohibited or restricted by FDA regulations for use in cosmetics. Oral consumption data suggests doses of 750-1500 mg daily for up to 90 days are possibly safe, with rare mild side effects. While the native plant has been linked to liver injury in grazing animals, human cases are not convincingly connected to typical doses. INCIDecoder reports low irritancy and comedogenicity for topical use.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Tribulus Terrestris Extract demonstrates promising multi-functional benefits in preclinical studies, particularly for inflammation and barrier support, but requires robust human clinical validation for definitive inclusion as a core active in precision skincare.
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References
Sources