Alix Earle started spraying it on her face, and everyone followed suit.
But what exactly is this “hypochlorous acid spray,” and why are Gen-Z-led skincare routines
suddenly starting with it?
Hypochlorous acid (HOCl), often described as a natural first responder of the immune
system, has been studied for more than 150 years. First identified in French laboratories in
the village of Javel in the 19th century, scientists Labarraque and later Semmelweis
observed that hypochlorous solutions helped prevent wound infections and reduce the
spread of puerperal fever. During World War I, HOCl solutions were used broadly for
hygiene and wound care, including infections such as gangrene and diphtheria (Beattie,
Lewis and Gee, 1917).
Decades later, researchers confirmed what those early physicians had observed.
Hypochlorous acid is a molecule the body itself produces inside white blood cells to
neutralize microbes and support tissue protection (KlebanoW, 1975).
From immune defense to modern skin care
When neutrophils encounter bacteria, they generate hypochlorous acid through the
myeloperoxidase system. This produces a localized antimicrobial burst that destroys
pathogens while signaling immune repair pathways (Winterbourn & Kettle, 2013).
Because HOCl is both antimicrobial and anti-inflammatory at physiologic concentrations,
medical research has long explored stabilized topical solutions for wound healing and
dermatologic support. Studies show HOCl can reduce bacterial burden while remaining
compatible with skin cells and healing tissue (Wang et al., 2007; Robson et al., 2014).
Compared with harsher antiseptics, HOCl demonstrates strong antimicrobial activity with
lower cytotoxicity to human skin (Lineweaver et al., 1985; Thorn et al., 2020).
This balance of effectiveness and skin compatibility distinguishes hypochlorous acid from
traditional disinfectants and explains its transition from hospitals to skin care.
Why dermatology embraced HOCl
Over the past two decades, dermatology has increasingly incorporated hypochlorous acid
into supportive care for conditions involving inflammation and microbial imbalance,
including acne, eczema, rosacea, and blepharitis. Research shows HOCl can reduce
Staphylococcus aureus colonization and inflammatory signaling associated with irritated
skin (Nakamura et al., 2017).
Unlike exfoliating acids or retinoids, HOCl does not resurface or thin the skin. Its benefits
come from helping maintain microbial balance and calming inflammation. These functions
align with modern skin barrier dermatology principles (Dreno et al., 2018).
The social media surge and why it is lasting
The recent rise of hypochlorous acid sprays across TikTok and Instagram reflects a broader
shift in skin care toward barrier support, microbiome awareness, and gentler daily
maintenance.
Viral popularity alone does not sustain an ingredient category. Hypochlorous acid has
persisted because the molecule itself is biologically relevant. The same chemistry that
protects tissue in the immune system can support skin externally when properly stabilized.
That formulation detail matters. HOCl exists in equilibrium with hypochlorite ion (OCl⁻),
and antimicrobial effectiveness is highest when HOCl predominates. This occurs in mildly
acidic solutions near physiologic skin pH of approximately 4 to 6 (Albrich et al., 1986;
Fukuzaki, 2006). In practical terms, formulation determines performance.
Why formulation quality separates hypochlorous sprays
Not all hypochlorous sprays are equivalent. Stability, purity, concentration, and pH control
determine whether HOCl remains active from production through use. Exposure to light,
air, or improper storage can shift the balance away from active hypochlorous acid toward
less effective species.
As consumer awareness grows, brands focused on formulation integrity rather than trend
positioning are shaping the next phase of the category.
Among emerging companies, Think Smarter Products has positioned itself at the
intersection of accessibility, formulation discipline, and ingredient transparency. Its
hypochlorous solutions are produced with controlled electrochemical processes and
stabilized to maintain physiologic pH. This helps preserve HOCl in its active form while
remaining compatible with skin.
The brand’s approach reflects a broader shift in the category. Marketing language is moving away from harsh antibacterial positioning and toward microbiome-supportive skin health.
What the research supports HOCl for
Across dermatology, microbiology, and wound-care literature, stabilized hypochlorous acid solutions are supported for:
• Reducing microbial load on skin and surfaces
• Supporting healing environments in compromised or irritated skin
• Helping control odor-causing bacteria
• Gentle cleansing of sensitive tissue
Emerging evidence also supports adjunctive use in acne-prone or eczema-affected skin
(Thorn et al., 2020; Del Rosso & Bhatia, 2018).
What hypochlorous sprays are not
Despite broad benefits, HOCl sprays are not substitutes for sunscreen, prescription
dermatologic therapy, or targeted actives. Their role is supportive. They help maintain
microbial balance and calm inflammation rather than aggressively altering skin structure.
Understanding that distinction explains why dermatologists increasingly recommend
hypochlorous solutions alongside established treatments, not instead of them.
The bottom line
Hypochlorous acid sprays are not a fleeting skincare trend. They represent the modern
translation of a molecule central to human immunity, one studied for more than a century
for its ability to reduce harmful microbes while remaining compatible with living tissue.
The recent surge in visibility may have come from social media, but the science did not.
What now distinguishes products in this rapidly expanding category is formulation quality.
The key question is how effectively a brand stabilizes and preserves hypochlorous acid
outside the body.
As consumers move toward barrier-supportive and microbiome-aware skin care, brands
grounded in chemistry and biological relevance are shaping the future of hypochlorous
solutions. Think Smarter Products reflects this shift by bringing clinically informed HOCl
technology into accessible daily use.
Sometimes the most effective skin-supporting ingredient is not new at all. It is one your body has relied on from the beginning.
References:
Albrich, J. M., McCarthy, C. A., & Hurst, J. K. (1986). Biological reactivity of hypochlorous
acid: implications for microbicidal mechanisms of leukocyte myeloperoxidase.
Proceedings of the National Academy of Sciences, 83(10), 3417–3421.
Beattie, J. M., Lewis, F. C., & Gee, H. H. (1917). The use of hypochlorous acid in the
treatment of infected wounds. British Medical Journal, 1, 497–499.
Del Rosso, J. Q., & Bhatia, N. (2018). Status report on topical hypochlorous acid: clinical
relevance in dermatology. Journal of Clinical and Aesthetic Dermatology, 11(11), 36–39.
Dreno, B., et al. (2018). The skin microbiome: a new actor in inflammatory acne. American
Journal of Clinical Dermatology, 19(S1), 1–8.
Fukuzaki, S. (2006). Mechanisms of actions of sodium hypochlorite in cleaning and
disinfection processes. Biocontrol Science, 11(4), 147–157.
KlebanoW, S. J. (1975). Antimicrobial mechanisms in neutrophilic polymorphonuclear
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Lineweaver, W., McMorris, S., Soucy, D., & Howard, R. (1985). Cellular and bacterial
toxicities of topical antimicrobials. Plastic and Reconstructive Surgery, 75(3), 394–396.
Nakamura, Y., et al. (2017). Topical hypochlorous acid reduces Staphylococcus aureus
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Robson, M. C., Payne, W. G., Ko, F., et al. (2014). Hypochlorous acid as a potential wound
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Thorn, R. M. S., Lee, S. W. H., Robinson, G. M., et al. (2020). Electrochemically activated
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Winterbourn, C. C., & Kettle, A. J. (2013). Redox reactions and microbial killing in the
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