Herbal Drink Containing 'Carageen'

Bought this drink yesterday from a local open-all-hours off-license/mini-mart/grocers, just because it looked good.

It's a herbal drink that tastes mostly like cough medicine. The ingredients are water, sugar, herbs and 'carageen'. This is, a dictionary search reveals, a dark purple edible seaweed found off the Atlantic coasts of Europe and North America.

Weird. It was drinkable, but I wouldn't buy it again