We get this question a lot! Most of our products come with a “Nutrition Facts” panel on the package showing levels of essential nutrients found in a usual or “normal” serving size.  Essential nutrients are ones required by the FDA to be on the Nutrition Facts label, but other equally important minerals and vitamins are also found in sea vegetables. In addition, some of our bulk packaging may lack the “Nutrition Facts”panel and/or some people consume their sea vegetables in “unusual” serving sizes.
Fortunately, the levels of many various nutrients found in a specific serving size can be easily calculated using information presented on our website’s “Seaweed Nutritional Facts” page and some simple math.  For the most accuracy, you’ll need a good scale to get a weight (grams) of your usual serving size or daily portion.  If you don’t have a scale you can at least get a good approximation using common measures such as ½ cup, tbsp, etc.  In this case, you can use the Typical Serving Size table at the bottom of the “Seaweed Nutritional Facts” page to get the weight in grams for common measures of various sea vegetables.
Once you have an idea of how much your serving weighs, the next step is to look for the nutrient of interest in the Nutritional Composition Tables near the top of the “Seaweed Nutritional Facts” page.  These tables show how much of a particular nutrient there is in 100 grams for various seaweed species and products, and you’ll have to divide this number by 100 to get how much there is in one gram. The tables include data for several important minerals and vitamins that aren’t required for the FDA Nutrition Facts label.  If the nutrient you’re interested in isn’t listed in these tables, it probably means we don’t have enough information to give the level with any confidence.  However, it never hurts to ask our Customer Service
Once you know how much your serving weighs and how much of the nutrient is present in one gram, the next step is to simply multiply the two together.  Here’s an example of how the process works.  Let’s say you want to know how much zinc you’re getting in 2 tsp of dulse powder added to a smoothie.  The Nutritional Composition Table says there’s 3mg of zinc in 100g of dulse, so 1g of dulse would contain 0.03mg of zinc (3÷100).  The Typical Serving Size Table says that 1tsp of dulse powder weighs 4g, so 2 tsp would weigh 8g.  8g of dulse powder X 0.03mg of zinc per gram =0.24mg of zinc.  Incidentally, humans require about 11mg of zinc per day, so 2 tsp of dulse powder meets about 2% of the recommended daily intake for zinc.
It’s important to remember, though, that it’s not possible to know with certainty the exact level of a nutrient present in a serving. This is because seaweed is a wild marine plant and its nutritional profile varies depending on season, age, location and other variables. The nutrient levels provided on our labels and in our tables are based on composite averages using the best available data, but each particular batch may contain more or less of a particular nutrient.