I'm in Canada too.
I think curcumin is a weak immune stimulant, it activates the VDR (vitamin D receptor) which then regulates a lot of other genes. I am taking olmesartan which is a stronger VDR activator, so I've been told.
I would be interested in their theory about curcumin - is it the VDR that they are trying to target with it? Also the gingerol. I think you'd have to take pretty whopping large doses of curcumin.
You could try searching google or pubmed for curcumin + VDR agonist