Hi Tessa
yes, flaxseed oil is a rich source of omega 3 EFA tho fishoil is usually preferred. Some people with TS seem to get increased tics from fishoil (my son is one of those) and so for them flaxseed oil is a great alternative
mrsD has an excellent EFA 101 thread on the Vitamins forum here too
http://neurotalk.psychcentral.com/showthread.php?t=6092