Korean-style roasted seaweed, AKA nori. One package has about 1g carbs. They're good for a savory snack, sort of like an alternative to chips. Here are three kinds that I've tried, all tasty:
Stevia drink flavoring — the only one I like enough to repurchase is the berry flavor, but it's worth trying all the flavors to see which you prefer.
Psyllium husks: https://smile.amazon.com/gp/product/B000N7DP6G/
Just don't buy shady products. I buy this and turn them into pills DIY once a month. https://www.amazon.com/gp/product/B000N7DP6G/
Go see a doctor about lead and get yourself tested.