Spirulina, a type of blue-green algae, is one of those supplements touted to address every condition under the sun, ranging from obesity to cancer. It actually contains a rich store of nutrients, including potassium, B-vitamins, calcium, iron, magnesium and zinc, which suggest value for general nutritional support. Whether it possesses any medicinal benefit, however, remains unclear. The University of Pittsburgh Medical Center reports limited evidence of effectiveness for conditions such as high blood pressure, high cholesterol and ulcerative colitis, but not enough high-quality human research exists to draw any firm conclusions. If you believe taking spirulina will address a certain health concern, talk to your doctor about a suggested dose and the potential risks of using this supplement.
Lack of Clear Dosing Guidelines
A lack of in-depth research on this supplement makes it difficult to determine the doses necessary to provide any medicinal benefit. Drugs.com reports studies examining the effects of spirulina have used doses ranging from 1 g to 10 g.
The University of Michigan Health System notes spirulina manufacturers generally suggest taking 2 g to 3 g daily in divided doses, but that animal research indicates that you would likely require much higher doses to achieve any therapeutic benefit -- about 34 g daily or more for a 150-lb person. Ultimately, you should consult with a physician knowledgeable in nutritional supplements for guidance on how much you require.
Maximum Suggested Dose
The University of Pittsburgh Medical Center notes that many researchers advise you against consuming more than 50 g of spirulina daily. Spirulina contains substances that convert into uric acid, and consuming it in larger amounts than this might increase the risk of kidney stones and gout.
Use in Certain Individuals
The University of Michigan Health System reports that animal studies suggest that consuming spirulina while pregnant appears safe. Concerns over the possible contamination of blue-green algae supplements with lead and other dangerous substances, however, makes it prudent to avoid it altogether while pregnant.
If you have liver or kidney disease, always clear the use of supplements with your doctor; if appropriate to use, she might suggest doses different than those normally recommended.
The Memorial Sloan-Kettering Cancer Center reports spirulina has demonstrated a potential to stimulate immune system activity. Drugs.com reports concern in the medical community regarding the use of immune-stimulating substances in individuals who suffer from autoimmune diseases, where an overactive immune system leads to the body to destroy its own tissue.
Other Considerations for Use
Spirulina does not have any documented medication interactions, but this does not mean they do not potentially exist; always discuss the use of nutritional supplements with your doctor if you take any medications. Spirulina and other algae products can absorb harmful substances around them; ask a doctor, pharmacist or other knowledgeable health care provider for their recommendations on a safe product.
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