See our choice of vial seals that can protect the contents of the vial from moisture, particulate and bacteria. Choose from a plain tamper seal in a choice of colours and sizes or one that features the message ‘do not freeze keep refrigerated’. Both types of tamper seal are made using foil which makes any signs of tampering with a needle highly visual. The flexibility of the foil means it is easy to apply. Using a tamper evident vial seal can also help avoid double dosing of medicine. As the plain foil seals come in a range of colours these can be used for colour coding as part of a system.