Spirulina – The Super-Algae Protein with Antioxidants and Immune-Boosting Properties

Spirulina is a blue-green algae (cyanobacterium) that has been used as a food source by indigenous peoples in Mexico and Africa for millennia. With a protein content of up to 70%, a dense micronutrient profile, and the unique antioxidant phycocyanin, spirulina is one of the most nutrient-rich foods in the world.

Nutrient Profile

Nutrient	Per 10g Spirulina Powder	% Daily Value
Protein	5.7–7 g	~12 %
Iron	2.8 mg	~18 %
Vitamin B12	~17 µg (as pseudo-B12)	Note: not bioavailable for humans!
Phycocyanin	~1.5 g	Unique, no DRI
Gamma-Linolenic Acid (GLA)	~100 mg	–
Beta-Carotene	~1.6 mg	~200 % Vitamin A equivalent

Phycocyanin – The Key Active Ingredient

Phycocyanin is a blue pigment protein found exclusively in spirulina and other cyanobacteria. It is the most potent natural antioxidant in this algae family:

Potent scavenger of peroxyl radicals and superoxide
Inhibits COX-2 and LOX → anti-inflammatory
Immunomodulatory: Activates NK cells and macrophages
Neuroprotective: Inhibits neuroinflammation

Clinical Evidence

Application	Effect	Dose	Evidence
Lipid Profile	Triglycerides↓ ~16%, LDL↓, HDL↑	2–8 g/day	Well-supported (Meta-analyses)
Blood Pressure	Systolic -4 mmHg	4.5 g/day	Moderate
Allergies (Rhinitis)	Symptom reduction (histamine release↓)	2 g/day	Well-supported
Blood Sugar / T2D	Fasting blood sugar↓, HbA1c improvement	2 g/day	Moderate
Muscle Endurance	Delayed fatigue, post-exercise antioxidation	6 g/day	Moderate

Important Notes

Vitamin B12 Myth: Spirulina contains pseudo-vitamin B12 (cobamides), which cannot be used by the human body as true B12 and can even competitively displace active B12. Spirulina is therefore NOT a suitable B12 source for vegans.

Quality and Contamination: Spirulina can contain heavy metals (lead, cadmium, arsenic) and microcystins (liver toxins from other algae) if sourced from uncontrolled environments. Always choose GMP-certified, contaminant-tested products.

Dosage

Beginners: 1–2 g/day (increase slowly due to GI adaptation)
Therapeutic: 4–8 g/day
Protein Supplement: 10–15 g/day (in smoothies)
Intake: In the morning or before training; with water or a smoothie

Frequently Asked Questions (FAQ)

Spirulina vs. Chlorella – which is better?

Spirulina: Higher protein content, more phycocyanin, easier to consume directly. Chlorella: Stronger detoxifying effect (binds heavy metals), higher chlorophyll content, contains true CGF (Chlorella Growth Factor). Both complement each other well.

Can spirulina affect the taste of food?

Yes – spirulina has an intense, earthy, algae-like taste. In capsules, it is barely noticeable. In powder form, it is best disguised in smoothies with banana, mango, or cocoa.