Why Does American Chocolate Taste Different? The Science Behind the Hershey Flavour
Why Does American Chocolate Taste Different? The Science Behind the Hershey Flavour
Most British people who try American chocolate for the first time notice something. There is a flavour note sitting underneath the sweetness — slightly tangy, faintly acidic, vaguely reminiscent of something they cannot quite place. Americans who try British or European chocolate often have the opposite reaction: it is richer than expected, more intensely chocolatey, almost too much.
Both reactions are real and both have the same explanation. The difference comes down to a single industrial decision made in Pennsylvania in the early 20th century, a compound found in Parmesan cheese and rancid butter, and the basic geographical problem of making chocolate in a country the size of a continent.
Before the flavour question, there is a regulatory difference that shapes everything else. In the United States a product can be labelled milk chocolate with as little as 10 per cent chocolate liquor. Across the European Union the minimum is 25 per cent total dry cocoa solids. The United Kingdom sits between the two: a derogation first granted in the 1970s, and carried forward when the modern rules were written, lets British manufacturers use the name milk chocolate at 20 per cent cocoa solids provided the product also carries 20 per cent milk solids. That clause is what Cadbury Dairy Milk is built on.
The consequence is one of the odder quirks of confectionery law. A bar that is legally milk chocolate in Birmingham has to be sold as family milk chocolate in Paris or Berlin, because it does not meet the continental threshold. The recipe does not change. Only the name on the wrapper does.
Cocoa solids are where the complex, bitter, roasted flavour of chocolate lives. More cocoa means a deeper chocolate character; less cocoa means a product dominated by sugar and milk. So before you consider any manufacturer's process, American and British milk chocolate start from fundamentally different recipes, and the sweetness British people notice is partly structural — a consequence of what the regulations allow and what shoppers on each side of the Atlantic came to expect.
Milton Hershey built his factory in Derry Township, Pennsylvania, in 1903. The town, now named Hershey in his honour, is not in dairy country. The milk he needed — enormous quantities of it, essential for milk chocolate — came from farms hundreds or even thousands of miles away. Moving perishable dairy across a continent in the early 20th century, before reliable refrigeration and without a motorway network, was a serious practical problem.
British manufacturers faced no equivalent difficulty. The country is small. Cadbury's factory at Bournville sits in the West Midlands with dairy farms close by. The milk arrives fresh, needs no stabilisation and goes straight into production. The chocolate reflects that — creamier, more dairy-forward, the flavour European palates came to expect.
Hershey's solution was to stabilise the milk before it travelled. The method, still a trade secret and known only as the Hershey Process, subjects the milk to a controlled version of natural spoilage. The technical term is lipolysis: the partial breakdown of fatty acids in milk by enzymes. The milk was, in a very precise and deliberate sense, partially soured. Just enough that it could not deteriorate further. Not enough that it tasted obviously bad. The stabilised milk survived the journey, and the process created a chemical byproduct that nobody, least of all Milton Hershey, expected would become the defining flavour note of American chocolate.
Butyric acid is a naturally occurring fatty acid. It is present in human gut bacteria, in sauerkraut, in Parmesan cheese and in rancid butter. It is also the compound responsible for a large part of what people detect in Hershey's chocolate, and in American chocolate more broadly.
The lipolysis process Hershey developed to stabilise milk produces butyric acid as a byproduct. Food science researchers at Penn State confirmed as long ago as 2000 that the company puts its chocolate through controlled lipolysis to produce that characteristic flavour. Hershey's own communications team denies that butyric acid is added directly, and that appears to be technically accurate. The acid is not added. It is produced by the process. The distinction is a careful one, and it is why both statements can be true at once.
For Americans that tangy note is simply what chocolate tastes like — a childhood taste memory, an expectation, a comfort flavour. For British people raised on creamier, less acidic European chocolate, the same note registers as unusual, metallic or faintly sour. Neither reaction is wrong. Both are responses to the same compound, filtered through entirely different flavour histories.
The remarkable outcome of the Hershey Process is not that it created a distinctive flavour. It is that the distinctive flavour became the American standard for what chocolate is supposed to taste like. Hershey's was not one American brand among many. For most of the 20th century it was effectively the only mass-market milk chocolate most Americans could get. The Hershey bar was the chocolate bar. Its taste became the taste of chocolate itself, for one generation, then another, then another.
Other American manufacturers, aware their customers expected a specific profile, began adding butyric acid directly to their own products to replicate the note shoppers associated with chocolate. An acid that started life as the byproduct of a refrigeration problem became a deliberately added flavouring ingredient, because by then it tasted right.
This is how food culture works. Taste is not absolute. It is formed by whatever you ate first, at an age when flavour memories are being set. British people who find American chocolate tangy are not detecting a fault, and Americans who find British chocolate too rich are not wrong. Both are tasting the same phenomenon through different lenses. The same principle runs through most of the gap between the two traditions — see American sweets vs British sweets for the wider comparison.
The Hershey Process has one consequence British expatriates in the United States discover fast. Hershey's holds a longstanding licence to manufacture Cadbury-branded chocolate for the American market. The Cadbury products on US shelves are not made by Cadbury. They are made by Hershey, using Hershey's own process. American Cadbury does not taste like British Cadbury.
This is not a secret, but it surprises people every time. Expats who grew up with UK Cadbury and moved to America routinely bring British bars back in their luggage or order them from specialist importers, because the product sharing the name tastes fundamentally different. The Dairy Milk bars on American shelves are, from a taste perspective, Hershey bars in Cadbury packaging. The original flavour — higher cocoa butter, fresh dairy milk, no lipolysis — is a British product most Americans have never actually tasted.
If you have not tried American chocolate before, the Hershey's range is the most direct way to understand the flavour and the most honest starting point. The plain milk chocolate bar is the clearest expression of what the process produces: sweet, with a faintly tangy note beneath the sugar. Whether that reads as pleasant or strange depends almost entirely on your own flavour history.
Reese's Peanut Butter Cups, made with Hershey chocolate, add a third element. The peanut butter brings its own saltiness and richness, and it interacts with the Hershey note in a way that many people who dislike the plain bar find far more appealing. The peanut butter effectively moderates the chocolate, and the result is one of the most popular confectionery products in the world. See the complete Reese's guide and the Hershey's UK guide for the full range, or the story of how Reese's Pieces ended up in E.T. for the moment that made the brand a household name.
American chocolate is not trying to be British chocolate and failing. It is a different product, shaped by a different geography, a different industrial history and a different set of expectations built over more than a century. The butyric acid note British people notice is not a defect. It is the deliberate and consistent result of a process Milton Hershey developed because the United States was simply too big to ship fresh milk across without it.
The complete American chocolate range — Hershey's, Reese's and the full imported selection — is available wholesale at Sweet and Glory. For a broader guide to what makes American chocolate worth stocking, see the World Chocolate Day guide.
No minimum order. Free first parcel on orders over £150 ex VAT (additional boxes £7.10 each). Free pallet delivery over £650 ex VAT. Dispatched from Manchester. Create a free account to browse and order.
Why does Hershey's chocolate taste like sick to British people? Because it contains butyric acid, the same compound that gives sick, Parmesan and rancid butter their characteristic smell. It is not added as a flavouring. It forms when Hershey partially sours the milk through controlled lipolysis, a step introduced so fresh dairy could survive long journeys across America. British palates, raised on chocolate made with unstabilised fresh milk, have no reference point for that note, so it registers as a fault rather than a flavour.
Does Hershey's add butyric acid to its chocolate? No, and the company's denial is technically correct. The acid is not an ingredient. It is a byproduct of the lipolysis step used to stabilise the milk, so it forms during production rather than being poured in. Some other American manufacturers do add it directly, to match the flavour their customers already associate with chocolate.
Why does American Cadbury taste different from British Cadbury? Because it is not made by Cadbury. Hershey holds a longstanding licence to produce Cadbury-branded chocolate for the American market and makes it using the Hershey process and Hershey's recipe. The wrapper is the same. The bar underneath is not.
How much cocoa is in American milk chocolate compared with British? American milk chocolate needs only 10 per cent chocolate liquor to carry the name. British milk chocolate needs 20 per cent cocoa solids under a long-standing UK derogation, and the wider European standard is 25 per cent. That is why a Cadbury Dairy Milk bar has to be labelled family milk chocolate when it is sold in France or Germany, despite being milk chocolate at home.
Is butyric acid safe to eat? Yes. It is a short-chain fatty acid that occurs naturally in butter, hard cheeses and the human gut, where bacteria produce it by fermenting dietary fibre. The unpleasant association comes entirely from its smell at low concentrations, not from any risk in eating it.
Related guides: American sweets vs British sweets · Hershey's complete UK guide · Reese's complete UK guide · E.T. and Reese's Pieces story · Most popular American sweets UK
Sources
Hershey company history - the milk process and butyric acid
UK Cocoa and Chocolate Products Regulations 2003 - minimum cocoa solids
Written by Sharon Wilson, Sweet and Glory. Sweet and Glory has imported American and world confectionery into the UK from Trafford Park, Manchester, since 2015.
Most British people who try American chocolate for the first time notice something. There is a flavour note sitting underneath the sweetness — slightly tangy, faintly acidic, vaguely reminiscent of something they cannot quite place. Americans who try British or European chocolate often have the opposite reaction: it is richer than expected, more intensely chocolatey, almost too much.
Both reactions are real and both have the same explanation. The difference comes down to a single industrial decision made in Pennsylvania in the early 20th century, a compound found in Parmesan cheese and rancid butter, and the basic geographical problem of making chocolate in a country the size of a continent.
The Minimum Standards
Before the flavour question, there is a regulatory difference that shapes everything else. In the United States a product can be labelled milk chocolate with as little as 10 per cent chocolate liquor. Across the European Union the minimum is 25 per cent total dry cocoa solids. The United Kingdom sits between the two: a derogation first granted in the 1970s, and carried forward when the modern rules were written, lets British manufacturers use the name milk chocolate at 20 per cent cocoa solids provided the product also carries 20 per cent milk solids. That clause is what Cadbury Dairy Milk is built on.
The consequence is one of the odder quirks of confectionery law. A bar that is legally milk chocolate in Birmingham has to be sold as family milk chocolate in Paris or Berlin, because it does not meet the continental threshold. The recipe does not change. Only the name on the wrapper does.
Cocoa solids are where the complex, bitter, roasted flavour of chocolate lives. More cocoa means a deeper chocolate character; less cocoa means a product dominated by sugar and milk. So before you consider any manufacturer's process, American and British milk chocolate start from fundamentally different recipes, and the sweetness British people notice is partly structural — a consequence of what the regulations allow and what shoppers on each side of the Atlantic came to expect.
The Geography Problem
Milton Hershey built his factory in Derry Township, Pennsylvania, in 1903. The town, now named Hershey in his honour, is not in dairy country. The milk he needed — enormous quantities of it, essential for milk chocolate — came from farms hundreds or even thousands of miles away. Moving perishable dairy across a continent in the early 20th century, before reliable refrigeration and without a motorway network, was a serious practical problem.
British manufacturers faced no equivalent difficulty. The country is small. Cadbury's factory at Bournville sits in the West Midlands with dairy farms close by. The milk arrives fresh, needs no stabilisation and goes straight into production. The chocolate reflects that — creamier, more dairy-forward, the flavour European palates came to expect.
Hershey's solution was to stabilise the milk before it travelled. The method, still a trade secret and known only as the Hershey Process, subjects the milk to a controlled version of natural spoilage. The technical term is lipolysis: the partial breakdown of fatty acids in milk by enzymes. The milk was, in a very precise and deliberate sense, partially soured. Just enough that it could not deteriorate further. Not enough that it tasted obviously bad. The stabilised milk survived the journey, and the process created a chemical byproduct that nobody, least of all Milton Hershey, expected would become the defining flavour note of American chocolate.
Butyric Acid: The Compound at the Centre of It All
Butyric acid is a naturally occurring fatty acid. It is present in human gut bacteria, in sauerkraut, in Parmesan cheese and in rancid butter. It is also the compound responsible for a large part of what people detect in Hershey's chocolate, and in American chocolate more broadly.
The lipolysis process Hershey developed to stabilise milk produces butyric acid as a byproduct. Food science researchers at Penn State confirmed as long ago as 2000 that the company puts its chocolate through controlled lipolysis to produce that characteristic flavour. Hershey's own communications team denies that butyric acid is added directly, and that appears to be technically accurate. The acid is not added. It is produced by the process. The distinction is a careful one, and it is why both statements can be true at once.
For Americans that tangy note is simply what chocolate tastes like — a childhood taste memory, an expectation, a comfort flavour. For British people raised on creamier, less acidic European chocolate, the same note registers as unusual, metallic or faintly sour. Neither reaction is wrong. Both are responses to the same compound, filtered through entirely different flavour histories.
The Acquired Taste That Became the Standard
The remarkable outcome of the Hershey Process is not that it created a distinctive flavour. It is that the distinctive flavour became the American standard for what chocolate is supposed to taste like. Hershey's was not one American brand among many. For most of the 20th century it was effectively the only mass-market milk chocolate most Americans could get. The Hershey bar was the chocolate bar. Its taste became the taste of chocolate itself, for one generation, then another, then another.
Other American manufacturers, aware their customers expected a specific profile, began adding butyric acid directly to their own products to replicate the note shoppers associated with chocolate. An acid that started life as the byproduct of a refrigeration problem became a deliberately added flavouring ingredient, because by then it tasted right.
This is how food culture works. Taste is not absolute. It is formed by whatever you ate first, at an age when flavour memories are being set. British people who find American chocolate tangy are not detecting a fault, and Americans who find British chocolate too rich are not wrong. Both are tasting the same phenomenon through different lenses. The same principle runs through most of the gap between the two traditions — see American sweets vs British sweets for the wider comparison.
The American Cadbury Problem
The Hershey Process has one consequence British expatriates in the United States discover fast. Hershey's holds a longstanding licence to manufacture Cadbury-branded chocolate for the American market. The Cadbury products on US shelves are not made by Cadbury. They are made by Hershey, using Hershey's own process. American Cadbury does not taste like British Cadbury.
This is not a secret, but it surprises people every time. Expats who grew up with UK Cadbury and moved to America routinely bring British bars back in their luggage or order them from specialist importers, because the product sharing the name tastes fundamentally different. The Dairy Milk bars on American shelves are, from a taste perspective, Hershey bars in Cadbury packaging. The original flavour — higher cocoa butter, fresh dairy milk, no lipolysis — is a British product most Americans have never actually tasted.
What to Expect When You Try American Chocolate
If you have not tried American chocolate before, the Hershey's range is the most direct way to understand the flavour and the most honest starting point. The plain milk chocolate bar is the clearest expression of what the process produces: sweet, with a faintly tangy note beneath the sugar. Whether that reads as pleasant or strange depends almost entirely on your own flavour history.
Reese's Peanut Butter Cups, made with Hershey chocolate, add a third element. The peanut butter brings its own saltiness and richness, and it interacts with the Hershey note in a way that many people who dislike the plain bar find far more appealing. The peanut butter effectively moderates the chocolate, and the result is one of the most popular confectionery products in the world. See the complete Reese's guide and the Hershey's UK guide for the full range, or the story of how Reese's Pieces ended up in E.T. for the moment that made the brand a household name.
American chocolate is not trying to be British chocolate and failing. It is a different product, shaped by a different geography, a different industrial history and a different set of expectations built over more than a century. The butyric acid note British people notice is not a defect. It is the deliberate and consistent result of a process Milton Hershey developed because the United States was simply too big to ship fresh milk across without it.
Shop American Chocolate Wholesale in the UK
The complete American chocolate range — Hershey's, Reese's and the full imported selection — is available wholesale at Sweet and Glory. For a broader guide to what makes American chocolate worth stocking, see the World Chocolate Day guide.
No minimum order. Free first parcel on orders over £150 ex VAT (additional boxes £7.10 each). Free pallet delivery over £650 ex VAT. Dispatched from Manchester. Create a free account to browse and order.
Frequently Asked Questions
Why does Hershey's chocolate taste like sick to British people? Because it contains butyric acid, the same compound that gives sick, Parmesan and rancid butter their characteristic smell. It is not added as a flavouring. It forms when Hershey partially sours the milk through controlled lipolysis, a step introduced so fresh dairy could survive long journeys across America. British palates, raised on chocolate made with unstabilised fresh milk, have no reference point for that note, so it registers as a fault rather than a flavour.
Does Hershey's add butyric acid to its chocolate? No, and the company's denial is technically correct. The acid is not an ingredient. It is a byproduct of the lipolysis step used to stabilise the milk, so it forms during production rather than being poured in. Some other American manufacturers do add it directly, to match the flavour their customers already associate with chocolate.
Why does American Cadbury taste different from British Cadbury? Because it is not made by Cadbury. Hershey holds a longstanding licence to produce Cadbury-branded chocolate for the American market and makes it using the Hershey process and Hershey's recipe. The wrapper is the same. The bar underneath is not.
How much cocoa is in American milk chocolate compared with British? American milk chocolate needs only 10 per cent chocolate liquor to carry the name. British milk chocolate needs 20 per cent cocoa solids under a long-standing UK derogation, and the wider European standard is 25 per cent. That is why a Cadbury Dairy Milk bar has to be labelled family milk chocolate when it is sold in France or Germany, despite being milk chocolate at home.
Is butyric acid safe to eat? Yes. It is a short-chain fatty acid that occurs naturally in butter, hard cheeses and the human gut, where bacteria produce it by fermenting dietary fibre. The unpleasant association comes entirely from its smell at low concentrations, not from any risk in eating it.
Related guides: American sweets vs British sweets · Hershey's complete UK guide · Reese's complete UK guide · E.T. and Reese's Pieces story · Most popular American sweets UK
Sources
Hershey company history - the milk process and butyric acid
UK Cocoa and Chocolate Products Regulations 2003 - minimum cocoa solids
Written by Sharon Wilson, Sweet and Glory. Sweet and Glory has imported American and world confectionery into the UK from Trafford Park, Manchester, since 2015.
