Originally Posted by
A Man Ray Kind Of Sky
With respect to both you and the OP, I suspect such a note would arouse suspicion as it would be somewhere near the most bizarre thing that security staff had ever seen.
I agree (even though I suggested it!), but if it's a medical need then it's a medical need! I'd be inclined to add a white printed label (just stating my name and contents) to my jar of applesauce to make it look a little more familiar as a "medical thing"