What is the recommended dosage for Spirulina?

General: 1-3 g/day; Immune Support: 3-10 g/day

What are the side effects of Spirulina?

Potential side effects include: Gastrointestinal discomfort, Headache, Allergic reactions (rare), Contamination risk from wild-harvested sources (microcystins, heavy metals), May exacerbate autoimmune conditions (immunostimulatory).

What is spirulina and how does it support immune function?

Spirulina is a blue-green algae (cyanobacterium) rich in phycocyanin, a pigment with antioxidant and anti-inflammatory properties. Clinical studies have examined spirulina for its potential to enhance natural killer cell activity and modulate allergic immune responses.

What dosage of spirulina has been studied for immune support?

Clinical trials have used spirulina at doses of 1–8 g per day, with 2–4 g being the most common range for immune-related outcomes. For allergic rhinitis, doses of 1–2 g per day have been studied over periods of 4 to 12 weeks.

What are the potential side effects of spirulina?

Spirulina is generally well tolerated. Possible side effects include gastrointestinal discomfort, headache, and allergic reactions. Product quality is critical, as spirulina contaminated with microcystins or heavy metals poses health risks. Choose products tested for purity.

Spirulina

other

Also known as: Arthrospira platensis, Blue-Green Algae

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About

Spirulina's phycocyanin and polysaccharides enhance NK cell cytotoxicity and interferon-gamma (IFN-gamma) production, activate myeloid lineage cells, and exhibit potent antioxidant and anti-inflammatory activity. A 2020 comparative trial found spirulina was more effective than cetirizine for allergic rhinitis symptoms.

How It Works

Phycocyanin and polysaccharides enhance NK cell cytotoxicity and IFN-gamma production; activate myeloid lineage cells; phycocyanin also exhibits potent antioxidant and anti-inflammatory activity.

Evidence For Conditions

Condition	Grade	Studies	Participants
Allergic Rhinitis	C	3	150	View →

Side Effects

Gastrointestinal discomfort
Headache
Allergic reactions (rare)
Contamination risk from wild-harvested sources (microcystins, heavy metals)
May exacerbate autoimmune conditions (immunostimulatory)

Drug & Supplement Interactions

Immunosuppressant medications (may counteract immunosuppression)
Anticoagulants (may have additive effects)
Diabetes medications (may lower blood sugar)

Always inform your healthcare provider about all supplements you take.

Related Ingredients

Beta-Glucan Bovine Colostrum Lactoferrin

Quick Facts

Dosage: General: 1-3 g/day; Immune_Support: 3-10 g/day
Forms: tablet powder capsule
Natural Sources: Cultivated freshwater cyanobacterium
Upper Limit: No established UL; 10 g/day widely studied
Best Time: With or without food

Evidence Summary

Allergic Rhinitis C

FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.