Is Your Dishwash Liquid Toxic? What Isothiazolinones Are and Why They Matter

In March 2026, a Mumbai based orthopaedic surgeon posted a video calling dishwash liquid the most toxic product in your kitchen. It went viral. The ingredient being talked about was isothiazolinones.

Most people had never heard the word before. But chances are they had been exposed to it. Every day. Through the product used to wash the plates their family eats from.

What makes this harder to navigate is that isothiazolinones are not always declared on the label. In India, there is no regulation requiring cleaning product brands to disclose their full ingredient list. Which means a product can contain isothiazolinones and say nothing about it on the bottle.

Even some natural and plant-based brands use them. Despite the clean label. Despite the green packaging. This is what greenwashing looks like in practice. Not an outright lie. Just a carefully incomplete truth.

What Are Isothiazolinones

Isothiazolinones are a family of synthetic preservatives added to liquid products to prevent bacterial and fungal growth. The most common variants found in dishwash liquids are methylisothiazolinone (MI), methylchloroisothiazolinone (MCI), and benzisothiazolinone (BIT). On some labels they appear as Kathon CG, a trade name for the MI and MCI combination.

They are cheap. They are effective as antimicrobials. And they are used widely across household cleaning products, personal care products, paints, and industrial formulations precisely because of that.

Why They Are a Problem

Isothiazolinones are classified as strong skin sensitisers.

A sensitiser does not cause an immediate reaction. It works differently. With repeated exposure over time, the immune system learns to recognise the compound as a threat. Once that sensitisation has developed, even tiny concentrations are enough to trigger a response. This is the mechanism behind contact dermatitis. It does not happen on first contact. It is built up over months and years of daily use.

Published research in PubMed confirms that isothiazolinones can penetrate the skin, bind to cellular components, and induce oxidative stress and immune responses. The European Union has imposed strict concentration limits on isothiazolinones in leave-on cosmetics because of this sensitisation risk. In rinse-off products like dishwash liquid, they remain permitted at controlled levels.

The concern with isothiazolinones is not acute toxicity. It is the accumulation of low level exposure over time. Dishes are washed multiple times a day. Hands are in contact with the product daily. For humans and pets who interact with these surfaces repeatedly over months and years, the risk is not from a single exposure. It is from the dose that quietly builds.

The Label Gap and What It Means for Consumers

Mandatory full ingredient disclosure for household cleaning products does not yet exist in India. This is not unique to India. It is a regulatory gap that exists across many markets globally. The EU has only recently tightened these rules. Many countries are still working through it.

What this means in practice is that transparency is currently a choice brands make voluntarily, not a requirement they are held to. A product can carry claims like natural, plant-based, or gentle while containing isothiazolinones that are never mentioned on the label. Published research from the National Institute for Occupational Safety and Health in the United States found that some dish soaps that do not declare isothiazolinones still tested positive for them in laboratory analysis.

Until full ingredient disclosure becomes mandatory, the burden of transparency falls on brands. Green Molecule chooses full disclosure. Every ingredient is declared. Every claim is backed by independent testing. Not because regulation requires it. Because the people using the product deserve to know what is in it.

What Green Molecule Uses Instead

Green Molecule dishwash liquid does not contain isothiazolinones.

The preservative system is EcoCert certified. Green Molecule dishwash liquid achieves 99.99% germicidal efficacy against bacteria, spores, and fungi without isothiazolinones and without any synthetic preservative classified as a skin sensitiser.

The formula has been independently tested for skin sensitisation with long-term repeated exposure. No sensitisation was detected.

Effective preservation and skin safety are not a trade-off. They are a formulation choice.

The formula is also free from synthetic fragrance, ethylene glycol, propylene glycol, PEG, EDTA, SLS and SLES. Every claim is backed by independent NABL accredited testing. The full testing story is documented in our dedicated lab report. [The residue story and what it means for your dishes is covered here. 

How to Check Your Current Dishwash Liquid

Look for any of these on the ingredient list:

Methylisothiazolinone. Methylchloroisothiazolinone. Benzisothiazolinone. MIT. MCI. BIT. Kathon CG.

If no full ingredient list is shown, that itself is worth noting.

Clean Should Mean the Whole Story

The dishes food is eaten from should carry food. Not preservative residue. Not compounds that require scrutiny but go undisclosed because transparency is not yet required.

Clean should mean the whole story. Not the parts that were chosen to be shared.

Order Green Molecule Dishwash Liquid at greenmolecule.asia

Green Molecule. Clean Confidently.

Frequently Asked Questions

What are isothiazolinones in dishwash liquid? Isothiazolinones are synthetic preservatives used to prevent bacterial and fungal growth in liquid cleaning products. The most common variants in dishwash liquids are methylisothiazolinone and methylchloroisothiazolinone. They are classified as strong skin sensitisers. Repeated exposure over time can cause the immune system to develop an allergic response, which is the mechanism behind contact dermatitis.

Do natural dishwash liquids contain isothiazolinones? Some do. There is no regulation in India requiring cleaning product brands to disclose their full ingredient list. A product can carry natural or plant-based claims while still containing isothiazolinones that are not declared on the label. This is a documented form of greenwashing in the cleaning products category.

Does Green Molecule dishwash liquid contain isothiazolinones? No. Green Molecule dishwash liquid uses an EcoCert certified preservative system and does not contain isothiazolinones. The formula achieves 99.99% germicidal efficacy without them and has been independently tested for skin sensitisation with long-term repeated exposure. No sensitisation was detected.

How do I know if my dishwash liquid contains isothiazolinones? Look for methylisothiazolinone, methylchloroisothiazolinone, benzisothiazolinone, MIT, MCI, BIT, or Kathon CG on the ingredient list. If no full ingredient list is shown, Indian regulations do not currently require household cleaning product brands to disclose one. The compound may be present without being declared.

Why is long term exposure to isothiazolinones a concern? The risk of isothiazolinones is not acute toxicity from a single exposure. It is sensitisation that develops through repeated low level contact over time. Once the immune system has been sensitised, even very small concentrations can trigger an allergic response. For a product used multiple times every day on hands and food contact surfaces, the cumulative exposure over months and years is the concern.

Is isothiazolinone free dishwash liquid available in India? Yes. Green Molecule dishwash liquid is formulated without isothiazolinones, uses EcoCert certified preservatives, achieves 99.99% germicidal efficacy, and is independently tested for skin sensitisation. 

Your dishes should carry food. Not preservative residue. Try Green Molecule risk free. 7 day refund. No questions. Order at greenmolecule.asia.

 

Sources

Isothiazolinones as preservatives: biological activity and safety assessment, PubMed: https://pubmed.ncbi.nlm.nih.gov/40415456/

Isothiazolinone detection in dish soap, National Institute for Occupational Safety and Health, PMC: https://pmc.ncbi.nlm.nih.gov/articles/PMC8330411/

Dr Manan Vora on dishwash liquid toxicity, India TV News, March 2026: https://www.indiatvnews.com/lifestyle/news/dishwashing-liquid-health-risks-dishwash-liquid-safe-chemicals-isothiazolinones-side-effects-toxicity-residue-utensils-2026-03-27-1035336