Verbena, when in doubt, keep things in the original packaging.

Carry packets of gelatin, one for each day of the trip, in a zippered baggie. Even though they say what they are, write on the baggie: POWDERED GELATIN FOR MORNING TEA.

I take a lot of supplements, and used to have an Herbalife shake every.single.morning.

Rather than carry a big canister, I'd mix my shake powder, put in a gallon baggie with a scoop and enough for the trip, with the same labeling: FORMULA ONE LATTE SHAKES, etc.

I've been to several countries, both on this continent and in Europe, and never had troubles, that way.