Organic Spirulina Powder: High Protein Facts, Label and Price
Spirulina is the dried biomass of Arthrospira, a filamentous cyanobacterium (commonly called a blue-green alga) that is grown in warm, alkaline water ponds and then filtered and dried into a dark green powder. The two species used commercially are Arthrospira platensis and Arthrospira maxima. A 2024 review in the journal Molecules reports that spirulina is 55–70% protein by dry weight and contains all the essential amino acids, together with minerals, vitamins and the blue protein-pigment phycocyanin[1]. This guide sets out what spirulina is, what our label declares per 100g, which protein claims the GB register allows for a food with this much protein, how to use the powder, and the pack sizes and prices at the time of writing.
Our Organic Spirulina Powder is one ingredient only: organic spirulina powder (100%), with no fillers, binders or additives. The label declares 60g of protein per 100g, which is about 82% of the powder’s energy value, so it meets the register’s condition for the nutrition claim “high protein” (at least 20% of energy from protein). That brings three authorised benefits: protein contributes to a growth in muscle mass, to the maintenance of muscle mass and to the maintenance of normal bones[2].
ORGANIC SPIRULINA 1KG POWDER
£24.99 · 1Kg Powder
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What Spirulina Is and How It Is Grown
Arthrospira grows naturally in alkaline lakes in Africa and Mexico and has been eaten there historically; the Aztecs harvested it from Lake Texcoco and it is still collected from Lake Chad. Today it is farmed in shallow raceway ponds, where the filaments are skimmed off, washed, and spray-dried or sun-dried, then milled. Certified organic spirulina is grown without synthetic fertilisers under organic rules. The powder is dark green because of chlorophyll, while its blue pigment, phycocyanin, is what is extracted to make blue spirulina.
The 2024 Molecules review puts spirulina’s protein content at 55–70% of dry weight, compares that with beef (17–22%), chicken (19–24%) and soybeans (35–40%), and reports a protein digestibility of 80–90%[1]. Our own label, which we set out below, declares 60g of protein per 100g. Explore our herbal and algae powders to see the other organic powders in the range.
Spirulina Protein Benefits: The Claims UK Rules Authorise
The benefits here belong to protein. Our label declares 60g of protein per 100g against an energy value of 1,247kJ: protein supplies about 82% of the energy, well above the 20% threshold for “high protein”, and for a food that is at least a source of protein the register authorises these claims in this wording: protein contributes to a growth in muscle mass; protein contributes to the maintenance of muscle mass; protein contributes to the maintenance of normal bones[2].
Every health claim on the Great Britain register passed a scientific review: independent scientists examined the research and the evidence behind it before it was authorised. The law itself says that health claims shall be “based on and substantiated by generally accepted scientific evidence” (Regulation (EC) No 1924/2006, Article 6).
The next sections show what our pouch declares per 100g, how much protein a teaspoon adds to your smoothie, and which of the three pouch sizes is right for you. Alpha01 products are made in the EU.
What the Label Declares per 100g
The figures below are copied from the nutritional information panel on our Organic Spirulina Powder (the 100g, 500g and 1kg pouches carry the same panel). They are per 100g of powder; the label does not declare a serving size.
Per 100g: energy 1,247kJ / 298kcal; fat 0g (of which saturates 0g); carbohydrate 30g (of which sugars 0.9g); fibre 8.7g; protein 60g; salt 1.6g. Vitamins and minerals per 100g: vitamin A 6,000µg (750% NRV); potassium 1,120mg (56% NRV); calcium 1,382mg (173% NRV); phosphorus 1,000mg (143% NRV); magnesium 150mg (40% NRV); iron 60mg (429% NRV); zinc 3.4mg (34% NRV). A level teaspoon of spirulina powder weighs roughly 3g, so a teaspoon provides about 1.8g of protein and about 1.8mg of iron[3].
Which Spirulina Powder Is Right for You?
If you’re comparing pack sizes and price — work it out per 100g. The same organic spirulina powder, with the same label panel, comes in three pouches: Organic Spirulina – 100g Powder at £5.99 (£5.99 per 100g, about 6p per gram), Organic Spirulina – 500g Powder at £16.99 (£3.40 per 100g) and Organic Spirulina – 1kg Powder at £24.99 (£2.50 per 100g), all at the time of writing[3]. Start with the 100g pouch if you want to try the taste first; at a level teaspoon (roughly 3g) a day the 500g pouch lasts you around five months, and the 1kg pouch is the one to buy if you use spirulina every day or cook with it. When you compare with another spirulina powder, check that its price is for the same weight and that the protein per 100g is on the label.
If you want tablets, or the blue pigment on its own — the powder is strong, savoury and marine in taste and turns anything it touches deep green. If you would rather have a fixed amount without the taste, the same organic spirulina is sold as Organic Spirulina 2000mg tablets; if you want the blue pigment phycocyanin on its own, for colouring rather than for its protein, choose Organic Blue Spirulina powder. All of them are certified organic and suitable for vegans.
If you read labels — four lines tell you what you are buying: the ingredients list (ours is one line, organic spirulina powder, 100%), the protein per 100g (60g here, which is what makes “high protein” an authorised claim), the vitamins and minerals declared per 100g and whether a serving size is given (a level teaspoon gives about 1.8g of protein), and the price. Add the powder to water, juice, shakes or smoothies, as the label suggests, and store the resealable pouch in a cool, dry place out of direct sunlight.
How to Use Organic Spirulina Powder
Our Organic Spirulina – 1kg Powder is certified organic, vegan and made of nothing but spirulina. The suggested use on the label is to add the powder to water, juice, shakes or smoothies and enjoy it as part of a balanced diet and healthy lifestyle; the label does not set a serving size. The taste is strong, savoury and marine, so start with half a teaspoon in a fruit smoothie (banana, pineapple or mango mask it well) and work up. It can also be stirred into yoghurt, hummus, pesto or energy-ball mixtures, and it colours anything it touches deep green. Store the pouch sealed in a cool, dry place out of direct sunlight. Alpha01 products are made in the EU.
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High protein: 60g of protein per 100g on the label. 100% organic spirulina, nothing added, in 100g, 500g and 1kg pouches.
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Spirulina Powder FAQs
1. Is spirulina powder high in protein?
Yes. Our label declares 60g of protein per 100g of powder, which is about 82% of its energy value; the register allows “high protein” where protein provides at least 20% of the energy. A level teaspoon, about 3g, adds about 1.8g of protein to your smoothie or juice. For a food that is a source of protein the register authorises the claims that protein contributes to a growth in muscle mass, to the maintenance of muscle mass and to the maintenance of normal bones.
2. How do I use spirulina powder?
Stir it into juice or water, blend it into a smoothie, or mix it into energy balls, dips and dressings. The flavour is strong and marine, so sweet fruit such as banana, pineapple or citrus balances it well. The label suggests adding the powder to water, juice, shakes or smoothies as part of a balanced diet and does not set a serving size; a level teaspoon is roughly 3g.
3. Is spirulina powder vegan?
Yes, spirulina is a cyanobacterium grown in water, with no animal input, and our powder contains nothing else, so it is vegan. The 2024 Molecules review reports that spirulina contains all the essential amino acids.
Spirulina is the dried biomass of the cyanobacterium Arthrospira, farmed in alkaline ponds and reported to be 55–70% protein by dry weight. Alpha01 Organic Spirulina Powder is 100% organic spirulina, and its label declares 60g of protein per 100g, so it is high in protein under the register’s definition; protein contributes to the maintenance of muscle mass and to the maintenance of normal bones. Sold in 100g, 500g and 1kg pouches at £5.99, £16.99 and £24.99 at the time of writing; vegan, made in the EU.
References
[1] Podgórska-Kryszczuk, I. (2024). Spirulina—An Invaluable Source of Macro- and Micronutrients with Broad Biological Activity and Application Potential. Molecules, 29(22), 5387 (Arthrospira platensis and A. maxima; 55–70% protein by dry weight with all essential amino acids; comparison with beef, chicken and soybeans; digestibility 80–90%). View Review
[2] Department of Health and Social Care. Great Britain nutrition and health claims (NHC) register, GOV.UK (accessed 2026-09-11; conditions for “source of protein” and “high protein”; authorised protein claims). View Register
[3] Alpha01. Organic Spirulina Powder 100g / 500g / 1kg: label nutritional information per 100g, ingredients, suggested use, storage and prices (accessed 2026-09-11). View Product
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