Spirulina

What is Spirulina?

Spirulina is a microscopic blue-green algae (technically a cyanobacterium) that grows naturally in alkaline freshwater lakes in subtropical and tropical regions. It has been consumed as a food source for centuries — by the Aztecs who harvested it from Lake Texcoco in Mexico, and by populations in Chad who still harvest and dry it into cakes called dihé. NASA investigated spirulina as a food source for space missions in the 1970s due to its exceptional nutritional density in a small mass.

Today, spirulina is cultivated commercially in controlled outdoor ponds and photobioreactors and is one of the world most popular superfood supplements. At approximately 60-70% protein by dry weight, it contains more protein per gram than beef, chicken, or eggs.

Phycocyanin: The Anti-Aging Star Compound

Spirulina most important and unique compound is phycocyanin — the vivid blue pigment that gives blue-green algae its characteristic colour. Phycocyanin is found in no other commonly consumed food and has demonstrated remarkable biological activity in research:

• Potent free radical scavenging activity — particularly against hydroxyl radicals, among the most damaging to DNA
• Inhibition of lipid peroxidation — prevents oxidative damage to cell membranes
• COX-2 and 5-LOX enzyme inhibition — two major inflammatory pathways
• Neuroprotective effects — reducing oxidative damage in brain tissue in animal models

Research-Supported Benefits

Cardiovascular Health

A 2016 meta-analysis published in the Journal of the Science of Food and Agriculture, pooling data from multiple randomised controlled trials, confirmed that spirulina supplementation (1-8g daily) significantly reduces total cholesterol, LDL, and triglycerides while increasing HDL. It also reduces oxidation of LDL — the critical step that initiates arterial plaque formation.

Antioxidant Enzyme Upregulation

A randomised controlled trial published in Cellular and Molecular Immunology found that spirulina supplementation significantly increased superoxide dismutase (SOD) and catalase activity in older adults — two of the primary antioxidant enzymes that decline with age and whose depletion accelerates cellular aging.

Immune Function in Older Adults

A Korean randomised trial found that elderly subjects taking spirulina showed significant improvements in natural killer cell activity, immunoglobulin levels, and overall immune response compared to placebo — suggesting it may help counteract immunosenescence (age-related immune decline).

Anti-Inflammatory Effects

Multiple studies have shown spirulina supplementation significantly reduces CRP — the primary blood marker of systemic inflammation. It also reduces TNF-alpha and IL-6, the pro-inflammatory cytokines most closely associated with accelerated biological aging.

How to Use Spirulina

Spirulina powder has a strong, distinctly algae flavour that many people find challenging. Blending 1 teaspoon into a smoothie with banana, mango, or citrus fruit effectively masks the taste. Tablets (typically 500mg each) are a convenient alternative — take 6-10 tablets daily with water. Most research uses doses of 1-8g daily; starting with 1-2g and gradually increasing helps avoid digestive adjustment in some people.

Quality note: Always choose spirulina that has been third-party tested for heavy metal contamination — particularly lead, arsenic, and cadmium. This is the most important quality consideration for spirulina.