Have you tried real seaweed instead of powders and tablets? It's really quite tasty. There are many different kinds. You can just eat some of them just as they are, like dulse or nori. Nori is good to make sushi. Dulse and kombe are good in soups. Hijiki makes a really good salad when reconstituted. I'm sure there are way more ways to prepare seaweed. My own skills are pretty meager. I'm not sure there's much nutritional difference between all the different kinds of seaweed but it is all good for you.
Female, 5'3", 50, Starting weight: 163lbs. Current weight: 135 (more or less).
I can squat 192.5lbs, press 75lbs and deadlift 210lbs