Zote soap is not classified as toxic. Its Safety Data Sheet gives it a health hazard rating of 1 out of 4 on the NFPA scale, meaning it poses only slight risk under normal use. The manufacturer states that the product “contains no substances which at their given concentration, are considered to be hazardous to health.” That said, Zote is a laundry soap, and using it in ways it wasn’t designed for, or accidentally swallowing it, introduces real risks worth understanding.
What’s Actually in Zote Soap
Zote’s ingredient list is relatively short compared to many commercial detergents. The base is sodium tallowate (saponified beef fat) and sodium cocoate (saponified coconut oil), which are the same types of fatty acid salts found in most traditional bar soaps. The formula also includes citronella oil (which gives it the distinctive scent and doubles as an insect repellent), glycerin, salt, fragrance, and optical brighteners that make fabrics appear whiter under light.
The FDA classifies tallow products as Generally Recognized as Safe. Citronella oil has been used in consumer products since 1948 without reports of serious adverse effects, according to the EPA, though it can cause skin irritation in some people. The optical brighteners are the least transparent ingredient. These are synthetic compounds that stay on fabric fibers after washing, and while they aren’t acutely toxic, their long-term safety profile is less well-studied than the soap’s other components.
Skin Irritation Risks
Many people use Zote beyond its intended purpose, grating it for hand-washing, using it as a body soap, or even washing their face with it. The core ingredients aren’t inherently dangerous on skin, but there are a few concerns. Tallow-based soaps have a pH between 9 and 10, which is significantly more alkaline than healthy skin (pH 5.4 to 5.9). Repeated use on skin can strip natural oils and disrupt the skin’s acid mantle, leading to dryness and irritation over time.
The added fragrance and citronella oil are potential sensitizers. The EPA notes that citronella’s primary safety concern is skin irritation, and products containing it carry precautionary labeling for that reason. If you’re using Zote directly on your skin and notice redness, itching, or dryness, the alkaline pH or the fragrance components are the most likely culprits. Tallow soap without added fragrances or dyes is generally less reactive, so the plain Zote formula carries more irritation risk than an unscented tallow bar would.
What Happens if Someone Swallows It
This is where the safety picture gets more serious. Accidental ingestion of bar soap is most common in young children and older adults with dementia. Most household soaps, including Zote, have an alkaline pH between 9 and 12, which irritates mucous membranes on contact.
A large study of bar soap ingestion cases found the most common symptoms were lip swelling (28% of cases), throat irritation (10%), excessive drooling (10%), vomiting (9%), and coughing (8%). For most otherwise healthy people, these symptoms are uncomfortable but resolve on their own. Small tastes or licks, the kind a curious toddler might take, rarely cause more than mild irritation and drooling.
The serious cases involved patients with dementia, who were far more likely to consume larger amounts. In that group, 75% developed symptoms compared to 34% of other patients, and they were hospitalized at a rate of 22% versus less than 1%. Two deaths occurred in the study, both in dementia patients, from aspiration pneumonia and airway obstruction following swelling and vomiting. If someone in your household has cognitive impairment, keeping Zote and other bar soaps out of reach is a practical precaution.
Safety for Washing Baby Clothes
Zote is popular for washing baby clothes because of its simple ingredient list and reputation as a gentle alternative to chemical-heavy detergents. The base ingredients are mild enough for this purpose, but two components deserve attention. The optical brighteners in Zote stay on fabric after rinsing. These residues sit against skin and can be irritating for babies with eczema or very sensitive skin. The fragrance and citronella oil can also leave trace amounts on clothing.
If your baby has no skin sensitivities, Zote is unlikely to cause problems when used for laundry, especially with a thorough rinse cycle. For babies with reactive skin, a fragrance-free, brightener-free detergent is a safer starting point.
One Notable Gap in the Safety Data
The Zote Safety Data Sheet includes an unusual disclosure: 74.8% of the mixture consists of ingredients with unknown acute toxicity. This doesn’t mean those ingredients are dangerous. It means the manufacturer hasn’t submitted full toxicological testing data for the majority of the formula’s components. For a laundry soap made primarily of saponified fats, this is common. Soap makers often rely on the long history of safe use for ingredients like sodium tallowate rather than conducting new animal or human toxicity studies. Still, it’s a reminder that “not classified as hazardous” and “thoroughly tested” are two different things.