The science behind spirulina: what we know, what we're researching, and what it means for your diet
Spirulina has existed for billions of years. Humans have been eating it for thousands of years. And yet scientific interest in this micro-organism has only grown over the past decades — not declined.
That is remarkable. Superfoods come and go. Spirulina stays. Not because it is well marketed, but because its nutritional profile is consistently impressive and research into the broader properties of the algae continues to advance.
This article explains what spirulina is, what science says about it so far, and how to meaningfully integrate it into a varied diet.
What is spirulina?
Spirulina (Arthrospira platensis) is a cyanobacterium — a microscopic, blue-green micro-organism that grows in warm, alkaline water through photosynthesis. It has been used as a food source for centuries, from the Aztecs to modern food producers.
Dried and ground, it produces a dark green powder with one of the highest protein concentrations of any plant-based source: 60–70% of dry weight, including all essential amino acids.
In addition to protein, spirulina contains:
- Iron
- Vitamins B1, B2, and B3
- Beta-carotene — precursor to vitamin A
- Phycocyanin — the blue pigment, widely studied in scientific research
- Chlorophyll and trace minerals
What does science say?
Protein and amino acid profile
This is the most well-supported aspect of spirulina. The protein in spirulina contains all essential amino acids in a ratio comparable to animal protein — exceptional for a plant-based source. Studies confirm a high digestibility of spirulina protein, partly because it has no cell wall that would hinder absorption.
Iron
Spirulina is a relevant source of iron. The bioavailability of plant-based (non-haem) iron is lower than that of animal iron. Combining it with vitamin C increases absorption.
Phycocyanin
Phycocyanin — the pigment that gives spirulina its blue tint — is the most actively researched component of the algae. Laboratory studies and animal studies show interesting properties. Large-scale clinical research in humans is still limited. The research agenda is growing rapidly.
Vitamin B12
Spirulina contains a form of B12, but the scientific consensus is that this form has only limited bioavailability for humans. Spirulina is therefore not a reliable replacement for animal B12 sources or certified B12 supplementation — including for vegans.
What spirulina contributes to your diet
Spirulina is primarily an exceptionally nutrient-dense ingredient. It fits well into a varied and balanced diet, and is particularly relevant for:
People on a plant-based diet who are looking for complete protein sources and plant-based iron as a supplement to their diet.
Active people who want to increase their protein intake without relying on animal sources or heavily processed protein products.
Anyone who consciously chooses ingredients whose origin, production method, and nutritional profile are transparent.
Spirulina is not a medicine and not a treatment. It contributes to a dietary pattern — not to the treatment of conditions.
How to use spirulina in practice?
A daily portion of 3–5 grams is common. The taste is pronounced and earthy — a small amount goes a long way.
Smoothies — the classic. Combines well with banana, plant-based milk, or citrus fruit that neutralises the intensity.
Cold drinks — dissolve in coconut water or cold-pressed juice. Do not heat — heat damages phycocyanin and some vitamins.
Energy balls and bars — mixes well with nuts, seeds, and dates for a nutritious snack.
Dressings and dips — small amounts in tahini or hummus increase the protein profile without dominating the flavour.
Baking — possible as a partial flour substitute, though some nutritional value is lost at high temperatures.
Why spirulina goes beyond nutrition
The interest in spirulina in 2026 is not only individual — it is also systemic.
Conventional protein production requires enormous amounts of land, water, and energy. Spirulina does not. It grows in closed systems, on a fraction of the space, without agricultural land, without fishing. It can be cultivated in urban environments, in climates where traditional agriculture does not work, with a minimal ecological footprint.
That is why food producers, ingredient specialists, and R&D teams are taking spirulina increasingly seriously — not as a supplement to the existing system, but as a replacement for parts of it.
At Aligma, we cultivate spirulina in closed photobioreactors, without open water bodies, without agricultural land, with full traceability from algae to end product. Not because it is a trend — but because it is the logical next step in how we produce raw materials.