hi Pearl Doves and welcome
magnesium is considered to be the singularly most important supplement in helping with TS tics
here is a link to Bonnie Grimaldi's website with more details on her groundbreaking research
http://www.bonniegr.com/news.htm
although vitB12 is a really valuable supplement, some people with TS have found that it makes them tic more and so it should be used cautiously at first until it is certain that there is no reaction to it
ps Natural Calm is a pure magnesium supplement that is getting rave reviews over at Latitudes and amongst many people with TS