The safety and effectiveness of all of the COVID-19 vaccines being used in the United Kingdom has been carefully assessed by the Medicines and Healthcare products Regulatory Agency (MHRA) before being authorised for use.
The safety and effectiveness of the COVID-19 vaccines continues to be checked while they are being used.
The vaccines do not contain organisms that grow in the body, and so are safe for people with disorders of the immune system. These people may not respond so well to the vaccine.