5 adulterants routinely found in Indian milk and what they may be doing to your body
In a landmark national survey, India’s food regulator tested 1,791 milk samples across the country. Nearly 70% failed to meet quality standards. Many weren’t just diluted, they were chemically altered with substances that have no place in food.
India is the world’s largest milk producer. Milk is a daily staple consumed in tea, given to children, and trusted as a symbol of nutrition. That’s what makes the reality of adulteration so alarming.
While adding water to milk is an old malpractice, modern adulteration has evolved. Today, some vendors use fertilisers, detergents, preservatives, and industrial chemicals to manipulate milk’s appearance, texture, and shelf life often at the cost of consumer health.
Here are five of the most commonly detected adulterants, why they’re used, and what research suggests about their impact.
1. Urea — The Fertiliser in Your Chai
Why it’s added
Milk is often diluted with water to increase volume. However, dilution reduces protein levels something easily detected in quality tests. Urea, a nitrogen-rich compound commonly used in fertilisers, artificially raises nitrogen content, making diluted milk appear protein-rich. It also slightly improves whiteness and consistency.
What research suggests
Studies have found urea to be among the most frequently detected adulterants. Regular consumption has been linked to kidney-related issues, including the formation of kidney stones. Unlike naturally occurring urea produced by the body, dietary urea places additional strain on renal function when consumed over time.
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2. Detergent & Synthetic Soap – The Foaming Agent
Why it’s added
Detergents are used to emulsify oils mixed into milk, ensuring a uniform texture. They also create foam a visual cue many consumers associate with freshness. Additionally, detergents enhance whiteness, masking signs of excessive dilution.
What research suggests
Health authorities have reported that detergent-adulterated milk can cause food poisoning and gastrointestinal issues. These substances are highly alkaline and can damage body tissues. Over time, they may disrupt the gut lining, leading to nausea, infections, and in severe cases, liver and kidney complications.
3. Formalin (Formaldehyde) — The Mortuary Preservative
Why it’s added
Formalin, a solution of formaldehyde, is widely used in mortuaries and laboratories to preserve biological tissue. In milk, even small quantities can significantly extend shelf life by preventing bacterial growth — especially useful where cold storage is lacking.
What research suggests
Formaldehyde is classified as a Group 1 carcinogen, meaning it is proven to cause cancer in humans. Long-term exposure through food has been associated with cancers of the respiratory and digestive systems. It can also damage the liver and kidneys and affect the nervous system.
Studies in India have found a significant percentage of milk samples testing positive for formalin. Since it metabolises slowly, repeated exposure can lead to accumulation in the body, increasing long-term health risks.
4. Neutralisers Chemicals That Mask Spoilage
Common examples: Caustic soda, baking soda, lime
Why they’re added
As milk spoils, it becomes acidic due to bacterial activity. Neutralisers alkaline substances are added to balance this acidity, effectively disguising spoiled milk as fresh by restoring its taste and smell.
What research suggests
Neutralisers don’t just hide spoilage they introduce new risks. These chemicals can irritate and damage the digestive tract. Long-term consumption has been linked to gastroenteritis, nausea, liver issues, and kidney damage. Some, like caustic soda, are highly corrosive and commonly used in industrial cleaning products.
Because these substances mask spoilage completely, consumers often have no sensory way to detect the problem.
5. Starch & Sugar The Density Deceivers
Why they’re added
Diluted milk becomes thin and fails basic density tests. Adding starch and sugar restores thickness and helps it pass quality checks. These substances also improve mouthfeel, making the milk seem richer than it actually is.
What research suggests
While starch and sugar aren’t inherently toxic, their role in adulteration is deceptive. They allow diluted, low-nutrient milk to pass as genuine. In many cases, such milk may also contain other harmful adulterants.
Regular consumption of sugar-adulterated milk can also pose metabolic risks, especially for individuals with diabetes who are unaware of the added sugar content. Starch has been associated with digestive discomfort in some cases.
The Bigger Picture
Milk adulteration today is no longer just about dilution, it’s about reconstruction. In some cases, milk is effectively “manufactured” using skimmed milk powder, water, sugar, and chemicals to mimic real milk.
The result? Consumers may be drinking a liquid that looks like milk, tastes like milk, but lacks its nutritional integrity — and may carry hidden health risks.
What makes this issue more concerning is that many adulterants are designed to bypass basic detection methods. Taste, smell, and appearance are no longer reliable indicators of purity.
What Can You Do?
Awareness is the first line of defence. Understanding what goes into adulterated milk helps you make more informed choices about sourcing and testing.
With increasing concerns around food safety, rapid detection solutions are becoming more accessible.
Now You Can Test Your Milk in Minutes — At Home
Milk adulteration test strips, such as MilkTrak, are designed to detect common adulterants like urea, detergent, neutralisers, formalin, hydrogen peroxide, and starch — all within minutes.
- Results in 5 minutes
- No laboratory required
- Based on DFRL-standard technology
- Detects 6+ adulterants
Simple enough for everyday use, yet reliable enough to provide peace of mind.