Spirulina — Frequently Asked Questions

Yes, spirulina contains all essential amino acids, making it a complete protein. It is roughly 60-70% protein by dry weight — more protein per gram than beef, eggs, or soybeans. However, because typical doses are 1-3g, spirulina contributes relatively small amounts of total daily protein. It is better viewed as a nutrient-dense supplement than a primary protein source.

Phycocyanin is the blue pigment that gives spirulina its characteristic blue-green color. It is a potent antioxidant and selective COX-2 inhibitor, meaning it reduces inflammation through a similar mechanism as drugs like celecoxib but without inhibiting the protective COX-1 enzyme. Phycocyanin content is a key quality marker — higher phycocyanin means more bioactive spirulina.

Spirulina grown in uncontrolled open ponds can be contaminated with heavy metals, microcystins (liver toxins from other cyanobacteria), and bacteria. Choose brands that are third-party tested (USP, NSF, or independent lab verification), grown in controlled closed-system environments, and certified free of microcystins. Organic certification alone does not guarantee absence of contamination.

Yes, meta-analyses provide moderate evidence for cholesterol reduction. Huang et al. (2016) pooled 12 randomized controlled trials and found spirulina significantly reduced LDL cholesterol by approximately 16% and triglycerides by about 10%, while modestly increasing HDL. Effective doses in trials ranged from 1-8g daily over 2-12 weeks. Spirulina is not a replacement for statins in high-risk patients but may complement lifestyle interventions.