Why Is Citric Acid Used in Healthcare Surface Disinfectants?

Citric acid is a commonly used ingredient across the food, pharmaceutical, chemical, and cosmetic industries. It occurs naturally in plants and animals and has been used in cleaners and disinfectants across healthcare and non-healthcare settings for more than 25 years. In some U.S. Environmental Protection Agency (EPA)-registered healthcare surface disinfectants, citric acid is used as an active ingredient. Its chemical properties help break down mineral-based soils, such as limescale, and loosen organic residue on surfaces. Citric acid also contributes to antimicrobial efficacy by lowering formulation pH and increasing microorganism susceptibility to inactivation.

As healthcare facilities seek solutions that balance strong cleaning performance, proven antimicrobial efficacy, and environmental impact, citric acid is becoming more common in cleaning and disinfecting products.

This growing use is also reflected in environmental ingredient and product programs: EPA’s Design for the Environment program includes multiple citric-acid-based disinfectants, and Green Seal lists citric acid as a “safer active ingredient” for institutional use.^1,2

How does citric acid disinfect?

Citric acid exhibits antimicrobial activity in disinfectant formulations by creating conditions that are unfavorable for microorganisms to survive.

1. Membrane and metabolic disruption: Citric acid lowers surface pH, which interferes with microbial function and membrane transport.³
2. Protein denaturation: By lowering pH, citric acid can interfere with protein structure and enzyme activity essential for microorganism survival.
3. Mineral binding: Citric acid also binds to minerals that help maintain microbial cell structure, further weakening microorganisms.²

Is citric acid compatible with healthcare surfaces?

Surface compatibility is an important consideration for EVS teams because disinfectants are applied to plastics, metals, and other materials throughout healthcare environments, often multiple times per day. Despite having a slightly acidic pH, citric acid is considered gentle on most common surfaces and materials.

However, when assessing a product for surface compatibility, healthcare facilities should consider the entire formulation, including non-active ingredients, and refer to equipment manufacturers’ instructions for use.

Why combine citric acid with other active ingredients?

In a multi-active disinfectant formulation, ingredients can play complementary roles. Citric acid can contribute cleaning performance and antimicrobial efficacy alongside other active ingredients, helping the finished product deliver the combination of efficacy, contact time and usability healthcare teams need.

Clorox Healthcare Quat Alcohol Disinfecting Wipes demonstrate this balanced formulation approach by combining quat, alcohol, and citric acid in a patent-pending triple-active system. The wipes are the only quat-alcohol-based disinfecting wipe EPA-registered to kill C. auris, Norovirus, and MDROs in 1 minute and kill 28 HAI-causing pathogens in 1 minute when used as directed on hard, nonporous surfaces. Compared with the leading healthcare quat-alcohol wipes, they deliver a 2X faster contact time with 40% less alcohol.* The wipes were designed to keep surfaces wet for the full contact time, helping support compliant use and enabling more surface coverage per wipe. Learn more about Clorox Healthcare Quat Alcohol Disinfecting Wipes.