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Mars has abandoned plans to use animal products in its chocolate, and has apologised to "upset" vegetarians.
The firm had said it would change the whey used in some of its products from a vegetarian source to one with traces of the animal enzyme, rennet.
The Vegetarian Society organised a campaign against the move, asking members to voice their concerns to parent company Masterfoods.
Mars said it became "very clear, very quickly" that it had made a mistake.
In just one week, more than 6,000 people bombarded the company, which produces the Mars, Snickers, Maltesers and Galaxy brands, with phone and e-mail complaints.
Forty MPs also signed a petition to voice their opposition.
Fiona Dawson, managing director of Mars UK, said the company had listened to customers and decided to reverse its decision.
http://news.bbc.co.uk/1/hi/uk/6673549.stm