Chlorella's impressive nutritional profile has led some to call it a "super food." While its exact nutrient content depends on growing conditions, the species used and how supplements are processed, it's clear it packs several beneficial nutrients.
Protein: Chlorella is 50–60%protein. What's more, it's a complete protein source, meaning it contains all nine essential amino acids
Vitamin B12: Some chlorella varieties may also contain vitamin B12, but more studies are needed
Iron and vitamin C: Chlorella can be a good source of iron. Depending on the supplement, it may provide anywhere from 6–40% of your daily need. It's also an excellent source of vitamin C, which helps you absorb iron.
Other antioxidants: These tiny green cells provide a wide range of antioxidants.
Other vitamins and minerals: Chlorella provides small amounts of magnesium, zinc, copper, potassium, calcium, folic acid and other B vitamins.
Omega-3s: As with other algae, chlorella contains some omega-3s. Just 3 grams of chlorella delivers 100 mg of omega-3s.
Fiber: In large quantities, chlorella can be a good source of fiber. However, most supplements don't provide even 1 gram of fiber per dose.