evidence: Animal products are only ever used to ensure the safety and effectiveness of the vaccine. It is recognised that this may raise issues of acceptability for some people who do not consume animal products, or those whose faith avoids consumption of products from specific animals. Despite this, many groups recognise the importance of vaccination and advise that vaccines containing prohibited substances can still be accepted. For example, one vegan group has produced detailed information on the various animal contents that are contained or used in vaccines. [...] Even though animal products are used in the development of most vaccines, and some vaccines contain small amounts of animal products, the number of animals used in vaccine development and production is kept to an absolute minimum. Animals and animal products are only used when they are vital for ensuring that the vaccine is safe and effective and their use is highly regulated.