Cannabidiol (CBD) oil has reached its presence most pharmacies and supermarkets in UK. It is widely available online and due to its coverage in media it is growing in popularity. CBD oil (also sold under name of hemp oil) is produced by extraction of cannabidiol from the hemp plant. Cannabidiol is one of over 100 cannabinoids which are present in cannabis plant. Hemp plants are normally used in production of CBD oils as these are high in cannabidiol and do not contain tetrahydrocannabinol (THC) in large amounts. THC is the psychoactive cannabinoid which makes people ‘high’ when they use cannabis.