Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Chlorella, a type of green freshwater algae, is sometimes used as a dietary supplement to support or treat anemia, primarily due to its rich nutrient profile. Several small-scale clinical studies have explored its effects, particularly in populations at risk for anemia, such as pregnant women or individuals with chronic kidney disease. The scientific rationale is that chlorella contains significant amounts of iron, vitamin B12 (though the bioavailability in humans is debated), and folate, all of which are essential for red blood cell formation and the prevention or treatment of certain types of anemia.

A few randomized controlled trials have shown that chlorella supplementation can help increase hemoglobin levels and reduce the incidence of anemia, especially in pregnant women. For example, a 2009 study in Japanese pregnant women found that those who took chlorella had lower rates of anemia and higher hemoglobin concentrations compared to those who did not supplement. Another study in dialysis patients found mild improvements in anemia markers with chlorella supplementation.

However, the quality and size of these studies are limited, and results are not universally consistent. Systematic reviews note that while chlorella may have a modest effect on improving anemia, especially iron-deficiency anemia, the evidence remains preliminary and insufficient for broad clinical recommendations. Further, the bioavailability of iron and B12 from chlorella is still under investigation. Therefore, while there is some scientific evidence supporting its use, it is not robust, and chlorella should not replace conventional therapies for anemia.

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