Mars Bar
A chocolate confectionery bar made from nougat and caramel covered in milk chocolate.
Last updated August 21, 2026
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Overview
Mars Bar is an internationally distributed chocolate confectionery brand owned and produced by Mars, Incorporated. The standard British and European bar combines a soft nougat centre and caramel layer beneath a milk-chocolate coating. It was first manufactured in Slough, England, in 1932 by Forrest Mars Sr., who adapted the concept of his father Frank C. Mars’s Milky Way bar for European tastes. The resulting product became one of Mars’s foundational non-U.S. confectionery brands and remains particularly associated with the United Kingdom, where it has been sold for generations. The Mars Bar is distinct from the American product that historically carried the same name. In the United States, the Mars bar introduced in 1936 contained nougat and toasted almonds coated in milk chocolate; caramel was added later. That American version was discontinued in 2002, replaced in 2003 by Snickers Almond, and was subsequently revived briefly through selected retail channels and later through Ethel M in a recipe closer to the original American formulation. The standard British or European bar, sometimes described as the Original, Global or European Mars, is the version most commonly meant by the name outside the United States. The product has been sold in multiple sizes and formats, including single bars, multipacks, smaller sharing or lunchbox portions, and the two-bar Mars Duo format. Mars has also extended the name into ice cream, biscuits, drinks, snack products and other licensed or region-specific formats. Recipes, weights, packaging and promotional claims have changed over time. In the United Kingdom, bar weights were reduced during the late 2000s and again in the 2010s amid rising input costs and debate about portion sizes. The brand has also used limited-edition packaging tied to football and other sporting events, while maintaining its recognizable dark wrapper and red-and-gold wordmark. Mars advertising has traditionally associated the product with energy, activity and everyday enjoyment. The long-running English-language line “A Mars a day helps you work, rest and play” established a distinctive functional positioning, while later campaigns emphasized pleasure, recharging and making the most of the day. Local markets have used different slogans and adaptations rather than a single globally uniform advertising platform. The brand has also acquired cultural visibility through the deep-fried Mars bar, a batter-coated dessert associated with Scottish chip shops. Mars has stated that this preparation is not authorized or endorsed by the company. The brand has experienced several notable controversies and product-safety events. Mars UK briefly announced in 2007 that certain products would use animal-derived rennet and would no longer be suitable for vegetarians, but reversed the decision after consumer and advocacy-group criticism. Mars products were recalled in New South Wales in 2005 after an extortion threat involving alleged poisoning, and a wider European, Middle Eastern and Asian recall followed in 2016 after plastic contamination was traced to a Mars factory in the Netherlands. Despite these incidents and periodic reformulation or size changes, Mars Bar remains an active flagship chocolate product within the Mars confectionery portfolio.
History
Forrest Mars Sr. created the Mars Bar in England in 1932 while working from the confectionery ideas developed by his father, Frank C. Mars. The product was manufactured in Slough by a small workforce and drew on the Milky Way, a U.S. bar already associated with the Mars family business. Mars adjusted the formula for European consumers, producing a bar built around nougat and caramel with a milk-chocolate coating. Early advertising highlighted the use of Cadbury chocolate couverture, reflecting the product’s British manufacturing context. The British formulation became the principal international Mars product. It spread through Europe and other Commonwealth markets, including Belgium in 1970, and was sold in a distinctive dark wrapper with red-and-gold lettering. Although the recipe and relative proportions of its components have changed, the basic combination has remained stable. A separate American Mars bar appeared in 1936 with nougat and toasted almonds. Caramel was later incorporated into that version, which was sold in cream-colored packaging and discontinued in 2002. Snickers Almond replaced it in 2003, while later limited revivals attempted to restore the American-style product. Mars has repeatedly refreshed the brand’s visual identity. The logo began as a tilted black wordmark, changed to a white treatment with a star in 1978, and received a heavier red-and-gold design in 1988. A more streamlined, cursive-style version was introduced in the early 2000s and became the basis of later packaging. In 2002, European markets received a broader brand refresh with localized taglines. The nougat was made lighter, the top chocolate layer thinner and the overall bar slightly smaller. The product portfolio expanded beyond the core bar through Mars Delight, Mars Planets, Mars Rocks, Mars Pods, Mars Biscuits, Mars Ice Cream, Mars drinks, Mars Mini Rolls and other market-specific products. Some extensions were discontinued, while others continued in selected markets. Size architecture also diversified into miniature, multipack, regular, sharing and twin-bar formats. In the United Kingdom, the regular bar was reduced from 62.5 grams to 58 grams in 2008 and later to 51 grams in 2013. Australian and New Zealand formats underwent comparable reductions. Marketing has historically connected Mars with energy and active daily routines. “A Mars a day helps you work, rest and play” became the brand’s best-known English-language slogan, while other markets used locally adapted messages. Promotional activity has included the 1969 Maxis from Mars car-prize campaign, football-related packaging in Britain, Euro 2008 “Hopp” packaging in Switzerland, and a 2010 England football promotion. The brand’s cultural footprint also includes the unauthorized deep-fried Mars bar, first reported in Scottish food outlets in the 1990s. The brand has faced operational and reputational challenges. In 2005, Mars products were recalled in New South Wales after an extortion threat. In 2007, Mars UK reversed a planned switch to animal-derived rennet after vegetarian consumers objected. In 2016, a precautionary recall across 55 countries followed the discovery of plastic contamination linked to the Veghel plant in the Netherlands. These events did not end the brand, which remains an active Mars, Incorporated confectionery line with broad international distribution.
- 2016
International precautionary recall
[1]Mars recalled products in 55 countries after plastic contamination was linked to its Veghel facility.
- 2008
UK regular bar reduced to 58 grams
[1]The regular British bar was reduced in weight, with Mars later identifying rising costs as the reason.
- 2003
Snickers Almond replaces American Mars bar
[1]Mars introduced Snickers Almond as the principal successor to the U.S. Mars formulation.
- 2002
European brand refresh and U.S. discontinuation
[1]European markets received localized messaging and recipe and size adjustments; the American Mars bar was discontinued.
- 1988
Red-and-gold logo introduced
[1]The brand adopted a heavier red wordmark with a gold outline.
- 1982
Bars supplied to the Falklands task force
[1]Three million Mars bars reportedly accompanied the British task force during the Falklands conflict.
- 1978
Logo redesigned with a star
[1]The earlier black wordmark was replaced by a white logo treatment featuring a star.
- 1970
Mars Bar introduced in Belgium
[1]The brand expanded into Belgium as part of its European distribution.
- 1936
American Mars bar introduced
[1]A separate U.S. version containing nougat and toasted almonds entered the American market.
- 1932
Mars Bar first manufactured in England
[1]Forrest Mars Sr. began manufacturing the bar in Slough, adapting the Milky Way concept for European tastes.
Products and positioning
An accessible, indulgent chocolate bar associated with nougat, caramel, milk chocolate, energy and everyday activity.
Chocolate bar · 1932
Mars Bar
The core British and international product consists of soft nougat and caramel covered in milk chocolate. It is sold in single, multipack, miniature, sharing and twin-bar formats, with recipe and size variations by market.
Chocolate bar · 1936
Mars Almond
The historical American Mars formulation combined nougat and toasted almonds under a milk-chocolate coating, with caramel added during part of its history. It was discontinued, replaced by Snickers Almond, and later revived in limited forms.
Twin-pack chocolate bar
Mars Duo
A two-bar format designed to replace or succeed the larger king-size format in some markets. It preserves the standard Mars combination while dividing it into two individually portionable bars.
Frozen confectionery
Mars Ice Cream
A frozen dessert extension using Mars-associated chocolate, caramel and nougat flavors. Availability and exact composition vary by market and product variant.
Chocolate snack
Mars Delight
A lighter, textured Mars-branded chocolate product offered in the United Kingdom. It was discontinued in 2008.
Bite-size confectionery
Mars Pods
Small Australian and New Zealand confectionery pieces with a crunchy wafer shell and Mars-style filling. The range has included market-specific variants.
Controversies
Marketing campaigns
- 2010St George’s Cross World Cup packaging
England · United Kingdom
Mars used the St George’s Cross on temporary packaging to promote England’s participation in the 2010 FIFA World Cup.
Outcome. Short-term event packaging and sports association.
- 2010Believe Tasmania
Australia
Mars temporarily renamed its leading Australian chocolate bar Believe to support Tasmania’s bid for an Australian Football League team.
Outcome. Cause-linked sports promotion.
- 2008Hopp
Switzerland
Mars packaging was temporarily branded Hopp, meaning Go, for UEFA Euro 2008.
Outcome. Localized sports promotion.
- 2006Believe
United Kingdom
Temporary Mars packaging used the word Believe during the FIFA World Cup period to support England’s campaign. The packaging generated negative publicity in Scotland.
Outcome. High visibility but regionally controversial packaging execution.
- 1969Maxis from Mars
United Kingdom
White Austin Maxi cars were driven around Britain, and consumers could win a car by matching a number found inside a Mars wrapper with a car number.
Outcome. Promotional campaign associated with the brand’s energy-and-prize advertising tradition.
Brand decisions
2016
Precautionary international recallOtherBackground
A customer found plastic in a Snickers bar produced at Mars’s Veghel facility in the Netherlands.
Action taken
Mars recalled Mars, Snickers and other products across 55 countries.
Aftermath
The incident was treated as a manufacturing-contamination event and affected multiple Mars confectionery brands.
2008
UK bar size reductionOtherBackground
Mars cited portion sizes and public discussion of obesity, while later acknowledging that rising costs were the real driver.
Action taken
The regular bar weight was reduced from 62.5 grams to 58 grams.
Aftermath
Further size reductions occurred in the United Kingdom in 2013 and in other markets at different times.
2002
European recipe and packaging refreshGeneration changeBackground
Mars sought to refresh the product across Europe and use market-specific communications.
Action taken
The company lightened the nougat, reduced the top chocolate layer and slightly reduced the overall weight, while introducing localized taglines.
Aftermath
The refreshed product retained the core Mars identity and continued in international markets.
2002
Discontinuation of American Mars barOtherBackground
The U.S. almond-based product had a different formulation from the British and international Mars Bar.
Action taken
Mars discontinued the American version.
Aftermath
Snickers Almond was introduced as its successor in 2003, with later limited revivals of the original-style product.
Recent events
- 2016
Mars recalls chocolate products across multiple countries after plastic contamination[1]
Recall
Mars issued a precautionary recall covering Mars, Snickers and other products in dozens of countries after a customer reported plastic in a Snickers bar. The source was traced to a production error at the company’s Veghel factory in the Netherlands.
- 2010
Mars Bar packaging adopts St George’s Cross for England World Cup promotion[1]
Campaign
UK packaging was temporarily redesigned with the St George’s Cross to promote England’s participation in the 2010 FIFA World Cup.
- 2008
Mars Bar size reduced in the United Kingdom[1]
Pricing
Mars UK reduced the weight of the regular bar. The company initially cited portion-size and obesity concerns, but later acknowledged that rising costs were the underlying reason.
- 2007
Mars reverses planned use of animal-derived rennet in UK products[1]
Other
Mars UK abandoned a change that would have made Mars and several related products unsuitable for vegetarians after criticism from consumers and vegetarian organizations.
- 2006
Mars Bar receives football-themed Believe packaging[1]
Campaign
British packaging temporarily used the word Believe during the FIFA World Cup period as part of a campaign connected with the England team. The treatment generated criticism in Scotland, where England did not represent the national team.
- 2005
Mars and Snickers products recalled in New South Wales after extortion threat[1]
Recall · Other
Masterfoods Australia removed Mars and Snickers products from New South Wales stores after an anonymous threat claimed that selected bars had been poisoned. Products later returned after the threat was assessed as negligible.
Sources1 sources
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