How Many Calories in Chlorella? Nutrition Facts & Macros

Dried chlorella has 333 calories per 100 g. However, typical serving sizes are much smaller — a tablespoon (7 g) has only 23 kcal, and a daily dose of 3-5 g has just 10-17 kcal. The calorie content is secondary to its extraordinary nutrient density: 66.7 g protein, 240 mg iron, and 4.53 mg riboflavin per 100 g.

Chlorella can support weight loss indirectly. Its extremely high protein content (66.7%) promotes satiety, and research suggests it may help regulate blood lipids and support metabolism. A typical 3-5 g daily dose adds only 10-17 calories while providing significant protein, iron, and B vitamins that prevent deficiency-related fatigue common during calorie restriction. It is not a fat burner — but a nutrient-dense supplement that fills nutritional gaps.

Standard daily doses range from 3-10 g. Beginners should start with 1-2 g per day and gradually increase to 3-5 g over 1-2 weeks, as chlorella can cause digestive adjustment. Athletes and those seeking detox support may take up to 10 g. Always choose broken cell wall chlorella for proper absorption. Can be mixed into smoothies, juices, or taken as tablets.

Both are nutrient-dense algae but differ significantly. Chlorella has more protein (66.7 vs 57.5 g per 100 g), vastly more iron (240 vs 28.5 mg), and more chlorophyll (the highest of any plant). Spirulina has no cell wall (higher raw bioavailability) while chlorella requires broken cell wall processing. Chlorella is a true single-celled green alga (eukaryote), spirulina is a cyanobacterium (prokaryote). Many people take both together for complementary benefits.

Chlorella is generally safe. Common side effects include digestive discomfort (bloating, gas, green stools, nausea) when starting — begin with small doses (1 g) and increase gradually over 1-2 weeks. Its extremely high iron content (240 mg per 100 g) means even small doses provide significant iron — people with hemochromatosis should avoid it. The cell wall can cause sensitivity in some people. Always buy broken cell wall products from reputable sources tested for heavy metals.

Chlorella Growth Factor (CGF) is a unique nucleotide-peptide complex found only in chlorella. It is produced during the rapid reproduction phase when chlorella cells divide every 20-24 hours. CGF contains nucleic acids (RNA and DNA), amino acids, vitamins, and minerals. Research suggests CGF may support cellular repair, immune function, and tissue growth. CGF is a key differentiator from spirulina and other algae supplements.