Some of the UK's best-selling chocolate bars, such as Mars and Twix, will no longer be suitable for vegetarians.
Also affecting brands such as Snickers and Maltesers, owner Masterfoods said it had started to use animal product rennet to make its chocolate products.
Masterfoods said the change was due to it switching the sourcing of its ingredients and the admission was a "principled decision" on its part.
The Vegetarian Society said the company's move was "incomprehensible".
'Extremely disappointed'
Masterfoods said it had started using rennet from 1 May and non-affected products had a "best before date" up to 1 October.
Masterfoods' decision to use non-vegetarian whey is a backward step Vegetarian Society
Rennet, a chemical sourced from calves' stomachs, is used in the production of whey.
It will now also be found in Bounty, Minstrels and Milky Way products, and the ice cream versions of all Masterfoods' bars.
"If the customer is an extremely strict vegetarian, then we are sorry the products are no longer suitable, but a less strict vegetarian should enjoy our chocolate," said Paul Goalby, corporate affairs manager for Masterfoods.
The Vegetarian Society said it was "extremely disappointed".
"At a time when more and more consumers are concerned about the provenance of their food, Masterfoods' decision to use non-vegetarian whey is a backward step," it said in a statement.
"Mars products are very popular with young people and many will be shocked to discover that their manufacture now relies on the extraction of rennet from the stomach lining of young calves," it added.
Some of them are vegetarian now, but possibly not all. Mars are one of the most notorious companies for clear labelling as to vegetarian suitability, you have to read the packet, and if it doesn't say, check with the company.
Stunningly beautiful adhaan from the Dome of the Rock in Masjid ul Aqsa Download (right click and choose "save target/link as").
This is a clear message for mankind in order that they may be warned thereby, and that they may know that He is only One God, and that those of understanding may take heed (14:52)
Indeed Allah knows, and you know not (16: 74, part)
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. Its like telling a a handless man to pick up his keys lol.
Plz don't say yes
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