Hi Roberta - Here's some info on the magnesium content of sea vegetables that was provided to me by Maine Coast Sea Vegetables. The cited amounts are per 100 g, dry I assume. alaria:918mg dulse:271mg kelp:900mg laver:378mg >I cannot find magnesium content of sea vegetables, which >may be high in magneisum, but they aren't in the books I have. Any >suggestions, comments appreciated. David [log in to unmask]