A jar of tomato paste can cost several times more than another jar sitting right beside it.
Same deep red color.
Same thick texture.
Same words on the front: tomato paste.
So how can one product be incredibly cheap while another costs significantly more?
For years, consumers have questioned whether ultra-cheap tomato products are always what they appear to be. Citric acid is often blamed, but the real story is considerably more complicated.
Citric acid itself is not proof that tomato paste is fake.
The bigger questions are how much actual tomato is in the product, whether anything has been added to increase thickness or weight, how concentrated the tomatoes are, and whether the label accurately tells you what you are buying.
And this is where food fraud becomes a very real issue.
First: What Is Citric Acid Doing in Tomato Paste?
Citric acid, also known as E330, is commonly used in food production as an acidity regulator.
Tomatoes are naturally acidic, but their acidity can vary depending on the variety, ripeness, growing conditions, and processing method.
Manufacturers may add citric acid to help control acidity and maintain a stable product.
International food standards allow citric acid to be used as an acidity regulator in processed tomato concentrates.
So if you see:
Tomatoes, citric acid
on the ingredient list, that alone should not make you assume the product is fraudulent.
Citric acid is not a mysterious filler capable of turning corn waste into tomato paste.
But that doesn’t mean all tomato pastes are equal.
The Bigger Question Is What Else May Be Inside
Authentic tomato paste is surprisingly simple.
Tomatoes are crushed, strained, heated, and concentrated by removing much of their water.
What remains is a thick mixture containing concentrated tomato solids.
Producing that concentration takes raw material, energy, equipment, transportation, and processing.
So naturally, people begin asking questions when they see extremely cheap products.
One explanation can simply be industrial efficiency.
Large factories process enormous quantities of tomatoes during harvest season. Tomatoes intended for processing may also be considerably cheaper than fresh supermarket tomatoes.
Manufacturers can purchase concentrated tomato material in bulk and package it elsewhere.
None of that means the product is fake.
But there is another possibility that has attracted the attention of food scientists:
adulteration.
Yes, Tomato Paste Can Be Adulterated
Food adulteration occurs when a cheaper ingredient is added, substituted, or used to make a food appear more valuable than it actually is.
Tomato paste is particularly vulnerable because consumers cannot easily see what went into the original mixture.
Once something has been cooked, concentrated, colored red, and blended into a thick paste, visual inspection tells you very little.
Researchers studying tomato paste authenticity have specifically investigated adulteration with substances including:
- corn starch
- ground paprika seeds
- sugar
- salt
Why would anyone add them?
Economics.
Tomato solids cost money.
A cheaper substance that increases weight, alters consistency, or helps imitate the characteristics of concentrated tomato could potentially lower production costs.
Corn starch is especially interesting because it thickens foods very effectively.
A product containing less concentrated tomato could potentially appear thicker if starch were added.
That does not mean manufacturers routinely do this.
But the fact that researchers have developed laboratory techniques specifically to detect corn starch and other adulterants in tomato paste tells us that authenticity is a legitimate food-quality issue.
Where the “Corn” Rumor Comes From
You may have heard claims online that cheap tomato paste is made from “corn waste.”
That phrase needs to be treated carefully.
There is evidence in scientific literature that corn starch can be used as a potential tomato-paste adulterant.
That is very different from saying that cheap tomato paste is routinely manufactured from leftover corn material.
Corn starch is a purified carbohydrate ingredient derived from corn. It is commonly used throughout the food industry as a thickener.
If it is legally included in a product where starch is permitted and clearly declared, that is one issue.
If starch is secretly added to a product being represented as pure tomato concentrate, that becomes an entirely different matter.
The problem is not simply that an ingredient comes from corn.
The problem is deception.
If consumers believe they are paying for concentrated tomatoes but are actually receiving a product diluted or extended with cheaper ingredients, that is food adulteration.
Why Adulteration Can Be Difficult to Spot
Imagine two bowls.
One contains genuine concentrated tomato paste.
The other contains somewhat less tomato material but has been adjusted with ingredients designed to change its thickness, sweetness, saltiness, or texture.
Would you necessarily see the difference?
Possibly not.
One study investigating adulterated tomato paste found that traditional measurements were much better at detecting relatively high levels of adulteration than very small amounts.
More advanced techniques such as near-infrared spectroscopy performed considerably better.
This means food authenticity is not always something the average consumer can determine by looking at a jar.
Color can be adjusted.
Consistency can be manipulated.
Taste can be altered.
And packaging can make almost anything look premium.
That is precisely why ingredient transparency and food-quality testing matter.
Why Is Some Tomato Paste So Cheap?
Before assuming fraud, there are several legitimate reasons one product can be much cheaper than another.
1. Industrial tomato varieties are cheap to process
Processing tomatoes are specifically bred for characteristics such as high yield and high solid content.
They are not necessarily the same tomatoes you buy individually at a grocery store.
Huge agricultural operations can produce them very efficiently.
2. Massive production reduces costs
A factory processing hundreds of tons of tomatoes can produce concentrate far more cheaply per kilogram than a small producer.
3. Tomato concentrate can be traded internationally
Tomato concentrate is a global commodity.
A company does not necessarily grow and process all the tomatoes printed on its packaging.
Concentrate may be produced in one country and later processed, diluted, seasoned, or packaged in another.
4. Different concentrations contain different amounts of tomato solids
Not every red tomato product contains the same concentration of tomatoes.
Tomato sauce, puree, double concentrate, and triple concentrate are very different products.
Comparing price without comparing concentration can therefore be misleading.
5. Packaging and branding matter
A premium glass jar with expensive marketing may cost significantly more even when the underlying tomato material is similar.
So price alone cannot prove quality.
But extremely low pricing can still justify taking a closer look at the label.
Tomato Paste, Tomato Puree and Tomato Sauce Are Not the Same
This distinction is important.
Tomato paste is highly concentrated.
Tomato puree contains more water.
Tomato sauce may contain spices, seasonings, sugar, salt, vegetables, oils, or other ingredients depending on the product and local regulations.
A cheap tomato sauce containing starch is therefore not automatically evidence of fraud if the starch is legally permitted and declared.
But a product presented as concentrated tomato paste creates a different consumer expectation.
When you buy tomato paste, you reasonably expect the majority of what you’re paying for to come from concentrated tomatoes.
What About Citric Acid?
This is where many viral claims become misleading.
Citric acid often gets presented as evidence that something suspicious is happening.
In reality, citric acid has a legitimate technological purpose.
It can regulate acidity and help manufacturers maintain consistent characteristics.
Its presence alone tells you very little about how much tomato is in the product.
You could have:
high-quality tomato paste + citric acid
or
lower-quality tomato product + citric acid
The citric acid does not tell you which one you have.
A much more useful question is:
What are the other ingredients, and how concentrated is the product?
How to Read the Label More Carefully
If you want a simple tomato paste, start with the ingredient list.
The cleanest versions may contain simply:
Tomatoes
or:
Tomatoes, salt
or sometimes:
Tomatoes, citric acid
A longer ingredient list does not automatically make a product unsafe, but it tells you that you are buying something more formulated.
Look for ingredients such as:
- modified starch
- corn starch
- sugar
- glucose syrup
- added vegetable material
- artificial colors
- thickeners
Whether these are appropriate depends on what the product is legally sold as.
For a tomato sauce, some additional ingredients are perfectly normal.
For a product marketed as pure concentrated tomato paste, you may prefer a much simpler label.
Check the Tomato Concentration
One of the most useful quality indicators is the amount of soluble tomato solids.
You may see terms such as:
double concentrated
or:
triple concentrated
You may also occasionally see a Brix value.
Brix is commonly used to estimate soluble solids in foods.
Higher concentration generally means more water has been removed.
That is one reason two containers of apparently similar tomato paste can have very different prices.
One may simply contain significantly more concentrated tomato solids.
Can Color Tell You Anything?
Not reliably.
Consumers often associate deep red tomato paste with quality.
But tomato color naturally varies depending on tomato variety, processing temperature, storage, and concentration.
A very bright red product is not automatically better.
Likewise, a slightly darker paste is not necessarily inferior.
Color should never replace reading the ingredient list.
What Is Economic Adulteration?
Regulators use terms such as economically motivated adulteration for cases where food is deliberately altered to increase profit or reduce production costs.
This can involve adding a cheaper substance, substituting an ingredient, or misrepresenting the product.
It has occurred across many food categories.
Honey may be diluted with cheaper syrups.
Olive oil can be substituted with cheaper oils.
Spices may contain fillers.
Juices can be altered with cheaper ingredients.
Tomato products are not magically immune to the same economic incentives.
The important point, however, is not to assume fraud without evidence.
A suspiciously cheap price should encourage curiosity—not panic.
The Simplest Rule When Buying Tomato Paste
Turn the package around.
Ignore the beautiful tomatoes printed on the front for a moment.
Read what is actually inside.
For consumers who want the simplest product possible, a short ingredient list remains one of the easiest filters.
Look for tomato as the dominant ingredient.
Understand whether you are buying sauce, puree, or concentrate.
Compare concentration.
Compare net weight.
And compare ingredient lists rather than price alone.
A cheap product can be perfectly legitimate.
An expensive product can still be mediocre.
And citric acid, despite all the controversy surrounding it online, is not the real question.
The real question is much simpler:
How much actual tomato are you getting for your money?
That is what consumers deserve to know.
