You’ve been eating it your whole life and no one ever told you. It’s a food additive used in ice cream, condiments, jellies and many other foods to make them thick and gooey.
Why should you be concerned?
You really shouldn’t.
It’s totally harmless. It’s derived from kelp of all things. Sweet, ecologically safe, commercially cultivated kelp. It’s only side effect is a tendency to bond with heavy metals and flush them from your body. It’s actually sold is it’s raw form as an herbal supplement for that very purpose.