Super-food or ‘pond scum’?

Spirulina, a type of blue-green algae, has attracted a wide following in the United States as a kind of super-food packed with protein, vitamins and minerals. Grown in brackish ponds and lakes around the world, spirulina sometimes has been given to malnourished populations as part of organized feeding programs. Many health experts, however, see no use for spirulina among well-fed people, calling it “expensive pond scum.”

Uses: In the United States, blue-green algae supplements are believed by some people to boost immunity, lower cholesterol, reduce cancer risk and encourage weight loss.

Dose: Tablets or capsules typically contain 500 milligrams per dose. Product labels often recommend taking three to five grams a day.

Precautions: The supplements generally are considered safe but can cause diarrhea and nausea. Some reports have indicated they can cause numbness and tingling in the arms and legs. Heavy metals from contaminated lakes and ponds can accumulate in algae, so the processing of the algae is crucial to product safety.

Research: Most of the research has been done in a test tubes or on lab animals. There is a profound lack of human data on the purported benefits of spirulina.

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

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-- Shari Roan