Skincare Ingredient
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Silica
In Skincare: Is Silica Safe? Comedogenic Rating & Side Effects
Safety Information
Quick Insights
At a glance
- 01
Silica is a naturally occurring ingredient found in clays, plants, and animal tissues.
- 02
In cosmetics, silica functions as an absorbent powder and a thickening agent.
- 03
Silica may enhance ingredient absorption and can be utilized as a delivery system for active compounds.
- 04
Silica is approved by the FDA for use as a food additive.
Key Benefits
What Silica does for your skin
Overview
Ingredient Profile
Data & Research
Scientific Facts
Common Uses
Formulation in Silica
Role of Silica
Active Cosmetic Mechanisms
ABRASIVE
Polishing & Scrubbing AgentRemoves dead skin cells and surface impurities through gentle scrubbing action
SCIENTIFIC ANALYSIS
// Evidence: Abrasive agents function through mechanical action to physically remove material from surfaces. In cosmetics, these are typically fine particles (silica, pumice, microcrystalline cellulose, polyethylene beads) that provide controlled friction to slough off dead corneocytes from the stratum corneum or remove dental plaque and stains from tooth enamel. The particle size, hardness, and shape determine the intensity of exfoliation.
ABSORBENT
Moisture & Oil AbsorberSoaks up excess moisture, oil, or other liquids from skin surfaces
SCIENTIFIC ANALYSIS
// Evidence: Absorbent materials possess high porosity and surface area that enable them to take up and retain liquids, sebum, perspiration through capillary action and adsorption. Common absorbents include kaolin clay, talc, silica, cornstarch. These ingredients can absorb multiple times their weight in moisture. The absorption mechanism can be physical (porous structure) or chemical (hygroscopic properties).
ANTICAKING
Free-Flow AgentPrevents powder particles from clumping together
SCIENTIFIC ANALYSIS
// Evidence: Anticaking agents prevent agglomeration by reducing interparticulate forces and moisture-induced bridging. These include hydrophobic materials like magnesium stearate, silica (fumed and precipitated forms), talc, and calcium silicate that coat particle surfaces, reducing van der Waals forces and preventing moisture absorption. The mechanism creates physical barriers between particles.
BULKING
Volume BuilderAdds volume and body without adding weight
SCIENTIFIC ANALYSIS
// Evidence: Bulking agents increase product volume while maintaining low density. These include low-density powders (hollow microspheres, perlite, expanded polymers), aerogels, and materials with high specific volume. Mechanism involves entrapping air within particle structures or creating open, porous networks. In hair products, bulking agents coat individual strands, increasing diameter and creating space between hairs.
OPACIFYING
Cloudiness CreatorReduces transparency and adds cloudiness to products
SCIENTIFIC ANALYSIS
// Evidence: Opacifying ingredients make formulations less clear through light scattering. These include titanium dioxide, zinc oxide, fatty alcohols, glycol stearates, and styrene/acrylates copolymer. The mechanism involves particles or crystalline structures that scatter light, reducing transmission and creating pearl-like or milky appearance. Particle size and refractive index determine degree of opacity. Used for aesthetic appeal and to mask colored ingredients.
VISCOSITY CONTROLLING
Thickness RegulatorAdjusts product thickness and flow properties
SCIENTIFIC ANALYSIS
// Evidence: Viscosity controlling ingredients modify product flow characteristics through thickening or thinning. Thickeners include natural gums (xanthan, guar), synthetic polymers (carbomers, acrylates), and inorganic thickeners (silica, clays). Mechanism varies: polymer chain entanglement, hydrogen bonding networks, particle association, or swelling. Rheology modifiers create desired texture, prevent separation, control application properties, and affect sensory perception. Can produce Newtonian (constant viscosity) or non-Newtonian (shear-thinning, thixotropic) flow behavior.
Products
containing Silica
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References
Scientific sources
Advances in Colloid and Interface Science, July 2021, page 10,2437
Cosmetic Ingredient Review, October 2019, pages 1-34
Nanomedicine, August 2019, pages 2,243-2,267
Biological and Pharmaceutical Bulletin, 2016, pages 1,201-1,205
European Journal of Pharmaceutics and Biopharmaceutics, January 2015, pages 116-125
Cosmetics & Toiletries, April 2015, pages 36-45
Similar Ingredients
Ingredients with similar chemical profiles and skincare properties.
Frequently Asked Questions
Silica — common questions
What is Silica in skincare?
Silica, also known as amorphous silica or hydrated silica, is a mineral composed of silicon and oxygen. Amorphous Silica lacks a defined crystalline structure. Hydrated silica contains additional water molecules bound to the silica compound. Related silica compounds sometimes used in cosmetic products include Alumina Magnesium Metasilicate, Aluminum Calcium Sodium Silicate, Aluminum Iron Silicates and Sodium Potassium Aluminum Silicate. Silica and hydrated silica are utilized in a variety of cos
What does Silica do? / Functions of Silica?
Common functions: ABRASIVE, ABSORBENT, ANTICAKING, BULKING, OPACIFYING, VISCOSITY CONTROLLING.
What is the comedogenic rating of Silica? / Is Silica comedogenic?
Silica has a comedogenic rating of 1 out of 5. A rating of 1 means it is unlikely to clog pores.
Does it clog pores?
Silica is unlikely to clog pores (rating 1/5).
Is Silica safe for skin?
Silica has a safety rating of 2 out of 5. A rating of 2 means it is generally considered safe for most skin types. Note: Generally considered safe in cosmetics (CIR); low comedogenicity; inhalation of airborne crystalline silica is a respiratory hazard but cosmetic silica is typically amorphous—avoid breathing loose pow
Is Silica good for sensitive skin?
Silica has an irritancy rating of 2 out of 5. A rating of 2 means it is generally well-tolerated.
What are the side effects of Silica in skincare?
Known considerations: Generally considered safe in cosmetics (CIR); low comedogenicity; inhalation of airborne crystalline silica is a respiratory hazard but cosmetic silica is typically amorphous—avoid breathing loose powders. The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that amorphous silica used in cosmetics is safe as currently practiced.