I’m fluent in Japanese and even the Japanese information on Euglina is severely lacking. They have a list of nutrients that are provided by the organism, but the only measurement that they list is how much of the organism itself is in their products. I haven’t been able to find more than that.
From what I can tell, even if they did get their act together and do proper nutrient accounting, it would just be a supplement, because their vitamin and mineral lists are not complete. (No choline, calcium, chromium, molybdenum, iodine selenium, sulfur, etc)
It may be more cost effective at that point, though, than using multivitamin supplements. That would be good, and I think that’s their point. I don’t think their goal is to replace food, but to add this to food to prevent common nutritional deficiencies.