Chlorella used to enhance immunity

The name “chlorella” refers to a number of species of single-celled green algae packed with chlorophyll, the chemical that gives plants their green color. Chlorella contains protein and carotenoids, plant pigments with antioxidant power. Commercial chlorella supplements usually contain one or more chlorella species, such as Chlorella vulgaris and Chlorella pyrenoidosa. The algae, which is a popular food supplement in Japan, is sometimes included in supplements containing other so-called green foods, such as spirulina and wheatgrass.

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Uses: People take chlorella supplements in the hopes that it will prevent or curb the spread of cancer, enhance immunity, promote a good balance of bacteria in the gut, and lower blood cholesterol.

Dose: Chlorella supplements come in granules, powders, tablets, soft gels and liquid extracts. Recommended doses vary widely, but usually fall in the range of several grams per day. Powders and granules also can be baked into breads and cookies.

Precautions: Chlorella may cause allergic reactions, as well as photosensitivity, in some people. Chlorella supplements can be rich in vitamin K, which can reduce the effectiveness of the blood-thinning drug warfarin.

Research: The bulk of evidence for chlorella’s long list of medicinal powers comes from animal studies. Studies in mice have shown that Chlorella vulgaris can protect against the development and spread of cancer, and other rodent studies have shown that it lowers cholesterol and helps organisms get rid of toxic chemicals, such as dioxins. Much less is known about how -- or how well -- chlorella works in humans.

Dietary supplement makers are not required by the U.S. government to demonstrate that their products are safe or effective. Ask your healthcare provider for advice on selecting a brand.

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-- Elena Conis