Butylene glycol is a humectant—a type of ingredient that draws water into the skin and helps it stay hydrated. It's a small, lightweight molecule commonly used in moisturizers to improve hydration without leaving a heavy feel on the skin.
Benefits
Increases skin hydration and moisture retention
Lightweight and absorbs quickly
Helps other active ingredients penetrate the skin more effectively
Science: Research demonstrates that butylene glycol, when combined with other humectants (like glycerin and hyaluronic acid) and occlusive ingredients in moisturizers, significantly improves skin hydration in both healthy skin and compromised skin conditions such as atopic dermatitis. It is recognized as a safe, effective humectant in dermatological formulations.
Glycerin is a naturally derived humectant—a ingredient that draws moisture from the air into your skin. It's one of the most widely used and well-studied moisturizing agents in skincare, helping skin feel softer and more hydrated.
Benefits
Attracts and retains moisture in the skin
Improves skin hydration and softness
Helps strengthen skin barrier function
Suitable for most skin types, including sensitive skin
Science: The Cosmetic Ingredient Review Expert Panel concluded glycerin is safe as used in cosmetics across all concentrations. Research shows glycerin effectively improves skin hydration and is well-tolerated with minimal irritation risk. It is also referenced in clinical guidelines for managing inflammatory skin conditions and maintaining skin integrity.
Sodium hyaluronate is the salt form of hyaluronic acid, a naturally occurring substance found in your skin that acts like a moisture magnet. In skincare products, it absorbs water from the environment and binds it to your skin, helping to hydrate and plump the skin's surface.
Benefits
Delivers intense hydration to the skin
Helps reduce the appearance of fine lines by improving skin moisture
Supports skin barrier function
Suitable for all skin types, including sensitive and oily skin
Potential concerns
In very dry climates with low humidity, it may draw moisture from deeper skin layers if not sealed with an occlusive product
Rare allergic reactions are possible but extremely uncommon
Science: While the provided research focuses on intra-articular injections for joint health (showing good safety and efficacy), hyaluronic acid and its salt form are well-established in dermatology for topical hydration. The molecule's safety profile is well-documented across decades of use in medical and cosmetic applications, with severe adverse reactions being extremely rare.
Disodium EDTA is a chelating agent that binds to metals and minerals in skincare formulations, helping to preserve product stability and extend shelf life. It's used in small amounts (typically under 2%) to prevent unwanted chemical reactions that could degrade the formula.
Benefits
Stabilizes cosmetic formulations by binding trace metals
Extends product shelf life and maintains efficacy
Allows other skincare ingredients to work more effectively
Potential concerns
May increase skin penetration of other ingredients by chelating calcium in the skin barrier—only a concern if combined with potentially harmful substances
Not absorbed through skin in normal use, but inhalation from sprays was identified as a theoretical concern in safety assessments
Science: The Cosmetic Ingredient Review Expert Panel confirmed safety in 2023 based on standard use concentrations. Clinical studies show no skin absorption; however, it can affect how other chemicals penetrate the skin, so formulators must account for this when combining with other actives.
Phenoxyethanol is a preservative that prevents bacteria, yeast, and mold from growing in skincare products, helping them stay fresh and safe to use. It has been used safely in cosmetics for decades and is effective at very low concentrations.
Benefits
Prevents microbial contamination and product spoilage
Broad-spectrum antimicrobial activity against bacteria and yeast
Minimal impact on beneficial skin bacteria when used at approved levels
Potential concerns
Rare allergic contact dermatitis in sensitive individuals
May cause irritation if used in products at concentrations above 1%
Science: The European Scientific Committee on Consumer Safety considers phenoxyethanol safe for all consumers, including children, at concentrations up to 1%. Adverse effects observed in animal studies required exposure levels approximately 200 times higher than those in cosmetic products, and it is classified as one of the most well-tolerated preservatives in cosmetics.
Red 4 is a synthetic red colorant (dye) used to give skincare products their color. It has no active skincare benefits and is included purely for aesthetic purposes to make products visually appealing.
Potential concerns
May cause allergic reactions or contact dermatitis in sensitive individuals
Potential irritant for those with dye sensitivities
Some synthetic colorants have been restricted or require specific approval in certain countries due to safety concerns
Science: Red 4 (also known as Amaranth) is an azo dye approved in many cosmetic regulations, though approval status varies by region. Limited peer-reviewed data is available specifically evaluating its safety profile in skincare formulations.
Trisodium EDTA is a chelating agent that binds to metals and minerals in cosmetic formulas, helping stabilize products and prevent them from breaking down. It's used in small amounts (typically under 2%) to maintain product consistency and shelf life.
Benefits
Stabilizes cosmetic formulations and extends shelf life
Prevents discoloration and degradation caused by trace metals
Helps preserve product efficacy over time
Potential concerns
May increase skin penetration of other ingredients by binding to calcium in skin
Should be avoided in inhalable products (sprays, powders) due to potential respiratory concerns
Not intended for ingestion or use in products applied to lips/mouth area
Science: The Cosmetic Ingredient Review Expert Panel confirmed safety in 2023 based on current practices and concentrations. While EDTA is not absorbed through intact skin, it can alter how other chemicals penetrate the skin by chelating calcium, so formulators must carefully consider ingredient combinations.
Sodium Methyl Cocoyl Taurate is a gentle, sulfate-free cleansing agent derived from coconut oil and the amino acid taurine. It removes dirt and oil from skin while being milder than traditional sulfate-based cleansers, making it suitable for sensitive skin types.
Benefits
Gentle cleansing without sulfates
Effective at removing dirt and oil
Lower irritation potential compared to SLS/SLES
Works well in sensitive skin formulations
Science: Research shows this amino acid-derived surfactant displays superior performance characteristics compared to sulfate alternatives, with larger stability ranges in formulations. It is widely used across personal care products including shampoos, face washes, and baby products, with validated detection methods confirming its safe use at typical concentrations.
