E. Lansdaal
The home and personal care industry is experiencing a major shift toward safer, sustainable, and multifunctional ingredients due to regulatory pressures and consumer demand for transparency. Organic acids, particularly lactic acid (LA), citric acid (CA), and glycolic acid (GA), are increasingly favored for their biodegradability, renewable sourcing, and diverse functional benefits. However, comparative data across multiple performance dimensions remain scarce. This study systematically evaluates LA, CA, and GA across six critical attributes: sustainability, regulatory compliance, antimicrobial efficacy, skin hydration, skin irritation, and descaling performance. Life Cycle Assessment (LCA) revealed LA as the most sustainable option, with the lowest carbon footprint, while CA and GA showed higher environmental impacts influenced by production region and feedstock origin. Regulatory review confirmed all three acids meet key compliance requirements, though LA offers broader biocidal registrations and CA lower label requirements. Dermatological testing demonstrated LA provides superior skin hydration and the lowest irritation potential, whereas GA exhibited higher irritation despite moderate hydration benefits. Functional performance assays indicated LA delivers the most effective descaling at higher concentrations, outperforming CA and GA, which plateaued beyond 2.5% (w/w). With antimicrobial efficacy (En1276:2019), 0.05% LA at pH 3.5 delivered complete kill against all test organisms, whereas GA and CA showed reduced efficacy, particularly against Gram negative bacteria. At pH 4, higher acid concentrations (≥1%) were necessary to obtain efficacy for most organisms, but LA consistently outperformed GA and CA, especially against E. coli. Overall, LA emerges as the preferred choice for formulators seeking to balance environmental impact, consumer safety, and functional performance, while CA and GA may serve as complementary ingredients in specific applications. These findings offer formulators evidence-based guidance for selecting organic acids that balance sustainability, safety, and performance in modern home and personal care formulations.
