Updated: July 2026
Spirulina, in short
Spirulina is a deep blue-green algae grown in fresh water and dried into a powder or tablets. It is prized as one of the most protein-dense foods available, providing complete plant protein with all nine essential amino acids, along with antioxidant compounds such as phycocyanin.
This guide covers what spirulina is, why it is so protein-rich, what else it provides, how to use it, and its long history as a traditional food.
When most people think of protein they picture meat or fish – but gram for gram, spirulina is one of the most protein-dense foods on the planet.
Here are the questions people ask most. For more, see our natural health and herbal tips guide.
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What is spirulina?
Spirulina is a deep blue-green algae, grown in fresh water and dried into a fine powder or pressed into tablets.
It has been eaten as a food for centuries and is valued today as a strikingly nutrient-dense ingredient.
Its vivid colour comes from natural pigments, including one called phycocyanin.
Is spirulina really high in protein?
Yes – spirulina is one of the most protein-dense foods there is, and provides all nine essential amino acids.
Gram for gram it carries far more protein than meat, though we tend to eat it by the spoonful rather than the plateful.
Protein contributes to a growth in muscle mass and to the maintenance of normal muscle mass and bones.
What else does spirulina provide?
Beyond protein, spirulina naturally provides iron and antioxidant compounds such as phycocyanin.
It is a genuinely nutrient-dense food for its size, which is a big part of its appeal.
Most people use it as a small daily boost rather than a main ingredient.
How do you use spirulina?
A teaspoon (around 3 to 5g) stirred into a smoothie or juice is the easiest way to enjoy it.
Its strong flavour blends best with fruit, so smoothies and juices are the usual home for it.
Start small, since a little goes a long way.
Has spirulina been eaten traditionally?
Yes – spirulina has a long history as a food, famously harvested from lakes by the Aztecs centuries ago.
It has been valued as a nourishing food across different cultures for generations.
It is a genuinely fascinating ingredient with real heritage – well worth reading up on if it interests you.
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Last updated: July 2026
This article is for general information only and is not medical advice. We make no medical claims. If you have a health concern, please speak to your GP or pharmacist.
