Shea butter is a natural fat extracted from the nuts of the African shea tree. In skincare, it works as a rich moisturizer and skin conditioning agent that helps soften and protect the skin barrier.
Benefits
Deep moisturization and hydration
Skin conditioning and softening
May help improve skin texture and elasticity
Potential concerns
May cause sensitivity or irritation in some individuals; formulations should be tested to ensure non-sensitizing properties
Quality varies by source—impurities in poorly processed shea butter could potentially cause irritation
Science: A 2024 safety assessment by the Cosmetic Ingredient Review Expert Panel concluded that shea-derived ingredients are safe at current use levels and concentrations when formulated to be non-sensitizing. Formulators should monitor for impurities and be aware of cumulative botanical constituents in multi-ingredient products.
Propylene carbonate is a clear, odorless liquid that acts as a solvent in skincare formulations, helping to dissolve and deliver other active ingredients effectively into the skin. It's also used to improve the texture and consistency of products like ointments and serums.
Benefits
Enhances penetration and delivery of active ingredients into the skin
Helps maintain product stability and consistency
Allows formulation of ingredients that would otherwise be difficult to dissolve
Potential concerns
Generally recognized as safe for topical use, but may cause irritation in sensitive individuals at high concentrations
Limited long-term safety data specific to skincare applications in everyday consumers
Science: Research shows propylene carbonate is effective as a solvent vehicle in topical formulations, successfully delivering active pharmaceutical ingredients like fluoride and paclitaxel through the skin with good tolerability after repeated application. However, most published data focuses on pharmaceutical rather than cosmetic skincare use.
Stearalkonium Hectorite is a clay-based thickening and suspending agent derived from hectorite (a natural mineral clay) combined with stearyl compounds. It's used in skincare products to create a smooth texture, stabilize formulations, and help other ingredients stay evenly distributed throughout the product.
Benefits
Improves product texture and spreadability
Helps stabilize and thicken formulations
Allows for better suspension of active ingredients
Science: Limited peer-reviewed data available for this ingredient. It is approved for cosmetic use by major regulatory bodies (EU, FDA) and is generally recognized as safe in skincare formulations at typical usage levels.
Parfum is a mixture of fragrant compounds used to add pleasant scent to skincare products. It's typically composed of essential oils, aromatic chemicals, and solvents blended together to create a specific fragrance profile.
Benefits
Improves sensory experience and enjoyment of using the product
Can enhance perceived product quality and appeal
Potential concerns
May cause allergic contact dermatitis or sensitization, especially in those with fragrance sensitivity
Can irritate sensitive or compromised skin barriers
Potential photosensitivity concerns with certain fragrance ingredients when exposed to sunlight
Science: Limited peer-reviewed data available for this ingredient. Fragrance is a known allergen and irritant in some individuals; regulatory bodies like the EU require disclosure of 26 specific allergenic fragrance components when present above threshold levels.
Dicaprylyl Ether is a lightweight emollient derived from fatty acids that helps soften and smooth the skin. It works by creating a protective layer on the skin's surface, improving texture and moisture retention without leaving a greasy feel.
Benefits
Softens and conditions skin
Lightweight, non-greasy texture
Improves skin smoothness
Enhances product spreadability
Science: An Expert Panel for Cosmetic Ingredient Safety (Cosmetic Ingredient Review) assessed dicaprylyl ether as part of a group of fatty ethers used in cosmetics and concluded these ingredients are safe for use in cosmetic formulations at typical concentrations.
Hydrogenated castor oil is a thickening agent and emulsifier derived from castor oil. It helps blend water and oil-based ingredients together and gives products a smooth, stable texture.
Benefits
Improves product texture and spreadability
Helps stabilize formulations
Provides emollient properties
Potential concerns
May cause skin irritation or allergic reactions in sensitive individuals
Some formulations containing polyoxyethylene-modified versions have been associated with anaphylactoid reactions in animal studies
Science: Research in veterinary dermatology indicates that polyoxyethylene hydrogenated castor oil (a modified form used as an excipient) can trigger mast cell degranulation and anaphylactoid reactions at very low concentrations, though the relevance to typical topical skincare use in humans requires further study. General hydrogenated castor oil has a long history of cosmetic use with relatively few documented adverse effects, but individual sensitivities can occur.
