
I don't give either daily, maybe twice a week and alternate when I remember LOL. It really depends on your feeding regime (most of my lot have different 'recipes'). If feeding all raw or home prepared I'd keep on top of it more but some get a mixture of moist complete and raw with/out biscuit etc so no hard and fast rules.
Both being powders (and quite strong smelling) the dogs can only get them with moist meals, a little at a time of the herbs etc otherwise as some have mentioned faddy dogs could be put off. It saves worrying about them eating veg - especially greens - one of mine wont touch veg in any form but eats these on days with cooked offal for example which is strong tasting/smelling enough to overcome the powder (in theory anyway!)
HTH, Teri :)