Evidence

Allergic rhinitis (nasal allergies): Anti- inflammatory properties of spirulina may improve certain aspects of nasal allergies. However, further high- quality studies are needed to confirm these findings.
Grade: C

Arsenic poisoning: Spirulina extract plus zinc may be useful for the treatment of arsenic poisoning. Additional research is needed to confirm these findings.
Grade: C

Diabetes: Preliminary study of people with type 2 diabetes mellitus reports that spirulina may reduce fasting blood sugar levels after two months of treatment. More research is needed before a firm conclusion can be drawn.
Grade: C

Eye disorders (blepharospasm): Super blue- green algae may decrease eye lid spasms but additional high- quality research is necessary to make a recommendation.
Grade: C

High cholesterol: In animal studies, spirulina has been found to lower blood cholesterol and triglyceride levels. Preliminary poor- quality studies in humans suggest a similar effect. Better research is needed before a firm conclusion can be drawn.
Grade: C

Malnutrition: Spirulina has been studied as a food supplement in infant malnutrition but results have been mixed. More research is necessary in this area.
Grade: C

Oral leukoplakia (pre- cancerous mouth lesions): Preliminary research has not clearly shown benefits of spirulina in the treatment of oral leukoplakia.
Grade: C

Weight loss: Spirulina is a popular therapy for weight loss and is sometimes marketed as a "vitamin enriched" appetite suppressant. However, little scientific information is available on the effect of spirulina on weight loss in humans.
Grade: C

Chronic fatigue syndrome: There is currently inadequate evidence to recommend the use of spirulina in chronic fatigue syndrome.
Grade: D

Chronic viral hepatitis: Preliminary study of spirulina for chronic viral hepatitis shows negative results.
Grade: D