Education
Formaldehyde isn’t always listed as “formaldehyde” on an ingredient label. Many products use formaldehyde-releasing preservatives that slowly release small amounts over time. Here’s what that means, how to spot them, and why this is a category we choose to avoid.
Quaternary ammonium compounds, often called “quats,” are widely used in conditioners, disinfectants, and cleaning products because of their antimicrobial and conditioning properties. However, research has raised concerns about irritation potential, mitochondrial effects, and hormone-related activity in laboratory studies. While these ingredients are permitted in many products, they are not biologically inert. Here’s how I evaluate quats from a formulation and cumulative exposure perspective.
Benzyl alcohol is widely used as a preservative in cosmetics and personal care products, and it is considered safe within established regulatory limits. However, regulatory acceptance does not mean biologically inert. Benzyl alcohol is a recognized contact allergen, is absorbed through the skin, and has demonstrated measurable biological activity in certain laboratory studies at higher concentrations. While it is not classified as a human carcinogen, it is not completely without risk.
When alternatives exist that better support sensitive skin and reduce cumulative preservative load, I choose those instead. Here’s how I evaluate benzyl alcohol from a formulation and real-life exposure perspective.
Citric acid is often labeled “mold-derived” and therefore unsafe. The reality is more nuanced. This post takes a clear look at fermentation, purification, and regulatory standards.