Kelp powder and dulse flakes are the easiest of the sea vegetables to use in a green smoothie. Simply add a half to a full teaspoon to your smoothie and blend. Since most seaweeds have a somewhat salty, “ocean” flavor, you don’t want to add too much. However, a teaspoon or so doesn’t negatively impact the flavor of a fruit smoothie at all. I actually really like it. It cuts the overall sweetness of the fruit without asserting any sort of saltiness or “marine” flavor. It won’t make your smoothie taste “fishy” as long as you don’t add several heaping tablespoons of the stuff!
Other sea vegetables are available as dried whole leaves or strands and if you have a high speed blender like the Vita-Mix, you can probably add a piece and blend. Otherwise, it’s probably best to soak in water for a bit to soften up and then add them to your green smoothie.
Re-hydrated kelp is delicious and not salty. Add a few strands and blend up in any smoothie recipe and feel free to combine with other leafy greens. Nori sheets (the ones typically used for making sushi rolls) are not the most nutritionally-rich choice, so I don’t use them in smoothies.
You can add sea vegetables to just about any green smoothie recipe. I added a teaspoon of dulse flakes to a green smoothie that had 3 bananas, 1 mango, 4 strawberries and one head of romaine lettuce. The smoothie was delicious and did not taste like the ocean at all.