Spirulina: What It Is and What It Contains

Spirulina is a blue-green alga that has been eaten for centuries.

Spirulina is around 60% protein by dry weight. It contains all essential amino acids, making it a complete protein source.

It contains phycocyanin, the blue pigment that gives spirulina its colour.

Spirulina is available in powder, tablet, and capsule form. Capsules offer the most convenient option without the strong taste. Take 1 capsule daily with water, as on our label. Do not exceed the recommended daily intake. Quality matters — choose a product that is tested for contaminants, as spirulina can accumulate heavy metals if grown in polluted water.

Quality control is especially important with spirulina because of how it is grown:

• Heavy metal testing: Spirulina can accumulate heavy metals (lead, mercury, arsenic) if grown in contaminated water. Always choose a brand that provides third-party testing certificates for heavy metals and microcystins (a toxin produced by some blue-green algae).
• Organic certification: Organic spirulina is grown without synthetic fertilisers or pesticides. While not strictly necessary, it provides an additional layer of quality assurance.
• Capsules vs. powder: Capsules are more convenient and avoid the strong, earthy taste that puts many people off spirulina powder. Tablets may contain binders that reduce absorption. If using powder, choose a product that dissolves easily without grittiness.
• Origin: The best spirulina is typically grown in controlled environments (closed photobioreactors or clean open ponds) in regions with abundant sunlight. Look for clear labelling of the country of origin.

Spirulina supplementation may be particularly beneficial for:

• Vegetarians and vegans seeking a complete protein source with all essential amino acids

Take 1 capsule daily as on the label. Vitamin C increases iron absorption. If using powder, blend it into smoothies with banana and mango to mask the taste. Store your spirulina in a cool, dark place — light and heat degrade the phycocyanin content.

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This article is for informational purposes only and does not constitute medical advice. Vitadefence supplements are food supplements, not medicines. They should not be used as a substitute for a varied diet and a healthy lifestyle. Consult a healthcare professional if you are pregnant, breastfeeding, on medication, or have a medical condition.