Plain oat bran already contains soluble dietary fibre, B vitamins, magnesium, and phosphorus. The soluble fibre absorbs water and forms a gel-like mass in the digestive tract, which is why oat bran may make a meal feel more filling and can help food move through the gut more evenly. Laminaria adds something different: iodine from the marine environment and trace minerals that are not typically found in cereal grains.
The combination broadens the dietary base in a simple way — you get both grain-based fibre and seaweed-derived minerals from one product. The kelp also contributes a savoury note, so the mix can work in dishes where you might otherwise add extra seasoning. For someone who already buys oat bran and seaweed separately, this product simply puts them together in one ingredient.
It is best treated as part of a varied diet rather than as the only source of any nutrient. If your goal is more fibre, oat bran is a good option. If your goal is iodine from food, kelp is a natural source. Combined here, they make a single pantry item with a broader nutritional profile than most plain grains.