Science
Mechanism of Action
This ingredient operates via several mechanisms: mechanically exfoliating the skin through an abrasive action to remove surface impurities, and delivering a broad spectrum of minerals (including calcium and magnesium) that contribute to skin moisturization and support dermal fiber cross-linking. Bioactive compounds like polyphenols and terpenes impart antioxidant properties, safeguarding the skin from free radicals and oxidative stress. It also exhibits film-forming, astringent, absorbent, soothing, stimulating, and mattifying effects.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
The solubilization of calcium and magnesium from Lithothamnion calcareum is highly pH dependent, increasing at lower pH levels. However, as the powder itself predominantly consists of calcium carbonate, it is crucial to avoid overall acidic pH formulations to maintain its stability. A 1% aqueous dispersion of Lithothamnion sp. powder typically presents an alkaline pH range of 9.5-10.5.
Conflicts
- acidic pH formulations
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Panel issued an 'Insufficient Data Available' (IDA) status for red algae-derived ingredients, including Lithothamnion Calcareum Powder, in September 2020. Human dermal irritation and in vitro ocular irritation data were considered. HET-CAM assays indicated slight or no ocular irritation at concentrations up to 5.7 – 6.1%. Acute and sub-chronic oral toxicity studies in rats showed no adverse effects at high doses (2000 mg/kg and >2 g/kg BW, respectively). Notably, this ingredient is also Generally Recognized As Safe (GRAS 000028) for food consumption.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Lithothamnion Calcareum Powder offers diverse skin benefits including exfoliation, mineral nourishment, and antioxidant protection, yet its full cosmetic safety profile awaits further data from the CIR Panel.
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