Spirulina is a type of blue-green algae that has been touted to treat conditions ranging from obesity to cancer. Rich in protein and various vitamins and minerals, it is consumed as a food in various parts of the world. Research suggests it might offer some positive health benefits but not enough evidence exists to confirm therapeutic value. Several safety concerns surround consumption of spirulina and other types of algae. If you believe taking it will address a particular health concern, talk to your doctor about daily dosage and whether it is appropriate for your use.
Dosage Guidelines
Not enough studies exist on spirulina to determine dosage guidelines for therapeutic benefit, according to Drugs.com. It notes that studies have used anywhere from 1 to 10 g and points to a study in which individuals with mild to moderate asthma who took 1 g daily experienced an improvement in lung function. The University of Michigan Health System reports that a study on the effects of spirulina for weight loss used 2.8 g daily three times a day for a month -- it notes however, that participants did not experience any statistically significant results. Manufacturers of spirulina supplements typically recommend taking 2,000 to 3,000 mg daily in divided doses. Discuss dosage with a physician before taking spirulina.
Toxicity Concerns
Spirulina appears safe and non-toxic; it might however, be contaminated with microcystins, substances that can cause neurological damage, kidney failure, liver damage, seizures, respiratory arrest, acute pancreatitis and deterioration of the heart muscle, according to the Memorial Sloan Kettering Cancer Center. The Beth Israel Deaconess Medical Center notes that Oregon, where a large number of manufacturers produce spirulina products, has set regulations limiting the amount of microcystins in these products. Not all manufacturers, however, may follow a similar safeguard. Spirulina products could also potentially contain heavy metals and harmful bacteria. Therefore, it is not recommended for use by pregnant or breast-feeding women.
Immune System Effects
The University of Maryland Medical Center notes that spirulina's potential to stimulate immune function might prove problematic if you have an autoimmune disorder such as lupus or rheumatoid arthritis. If you take medications to suppress immune system activity, it might interfere with their actions. Talk to your doctor before using spirulina.
Other Safety Concerns
Do not use spirulina if you suffer from phenylketonuria. If you have liver and/or kidney disease, clear the use of supplements with your doctor as these organs are particularly sensitive to what you put in your body.
References
- Drugs.com: Complete Spirulina Information
- Memorial Sloan Kettering Cancer Center; Blue-Green Algae; March 2009
- Beth Israel Deaconess Medical Center; Spirulina; February 2011
- University of Michigan Health System; Blue-Green Algae; December 2009
- University of Maryland Medical Center; Spirulina; May 2009
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