Spirulina 500mg — 60 Vegan Tablets

Spirulina 500mg by thecary

thecary's Spirulina delivers 500mg of pure spirulina per tablet — one of the most nutrient-dense plant foods on Earth. Spirulina is a microscopic blue-green algae that grows in alkaline freshwater lakes, consumed as food by the Aztecs of 16th-century Mexico and by traditional communities around Lake Chad in West Africa for centuries.

Spirulina is naturally rich in plant protein (around 60% by dry weight), B vitamins, iron, beta-carotene, essential fatty acids, and the unique blue-green pigment phycocyanin. It is one of the only plant foods to contain all nine essential amino acids in a complete protein profile.

Pure spirulina with no added fillers, flow agents, or synthetic ingredients. Vegan, GMO-free, and made in the UK in an FSSC 22000 certified facility. 60 tablets — a two-month supply at 500mg daily, or one-month supply at 1g daily (two tablets).

What is spirulina?

Spirulina (Arthrospira platensis) is a microscopic, spiral-shaped cyanobacterium — often referred to as blue-green algae — that grows naturally in alkaline freshwater lakes in tropical regions. It is one of the oldest life forms on Earth, with origins dating back over three billion years.

Spirulina was a staple food of the Aztecs in 16th-century Mexico, harvested from Lake Texcoco and pressed into cakes called tecuitlatl. It has been continuously consumed by communities around Lake Chad in West Africa since long before written records. In modern times, NASA has studied spirulina as a potential food source for long-duration space missions, given its remarkable nutrient density per gram.

What's in spirulina?

Few foods on the planet match spirulina's nutrient density per gram. Spirulina contains:

Plant protein — around 60–70% protein by dry weight, with all nine essential amino acids
Phycocyanin — the distinctive blue-green pigment, found in particularly high concentrations in spirulina
B vitamins — including B1, B2, B3 and B6
Iron — a meaningful plant source of bioavailable iron
Beta-carotene — a precursor to Vitamin A
Trace minerals — including copper, manganese, magnesium, potassium and selenium
Essential fatty acids — including GLA (gamma-linolenic acid), found in only a small number of foods
Chlorophyll — the green pigment shared with all photosynthetic life
Why people take spirulina

Spirulina is most commonly taken as part of:

Plant-based diets. Vegans and vegetarians often add spirulina to fill nutritional gaps — particularly for plant protein, iron, and broad nutrient density.

Active lifestyles. Athletes and active people use spirulina as a daily nutrient staple, often added to smoothies or taken in tablet form.

Daily wellness routines. Spirulina is positioned alongside other green-superfood staples — chlorella, wheatgrass, barley grass — as part of broader plant-forward wellness routines.

Eco-conscious nutrition. Spirulina is one of the most efficient plant proteins on the planet to produce, using a fraction of the land and water required for soy or grain — making it appealing to people focused on sustainable food choices.

Why this spirulina formula

500mg per tablet — A useful daily building block. Most published research on spirulina uses doses between 1g and 3g daily (two to six tablets). Start with one tablet daily for a gentle introduction, building up to two or three tablets for a fuller dose.

Pure spirulina — No added fillers, flow agents, or synthetic ingredients.

UK-made, FSSC 22000 certified — Manufactured under strict UK food-safety standards. Source quality is particularly important with spirulina because it can absorb compounds from its growing environment.

Tablet form — Spirulina has a strong, distinctive flavour that many find off-putting in powder form. Tablets allow a meaningful daily intake without having to taste it.



How to take Spirulina

Start with one tablet (500mg) daily, taken with food and water. Most people increase to two tablets (1g) daily after the first week, either together or split between morning and afternoon. For higher-dose use, three tablets daily (1.5g) is also well-tolerated.

Spirulina is best taken with food, particularly in the first week — taking it on an empty stomach can occasionally cause mild digestive discomfort.

For best results, take consistently for at least four weeks. Spirulina works as a daily nutritional staple rather than producing immediate effects.

Food supplements are not a substitute for a balanced diet and healthy lifestyle. Do not exceed the recommended dose.

Critical: Spirulina is not a reliable source of Vitamin B12

Spirulina is widely promoted as a vegan B12 source — but the science is clear that it is not. Spirulina contains corrinoids (sometimes called "pseudo-B12") that are chemically similar to true B12 but are not biologically active in the human body.

Vegans and vegetarians should not rely on spirulina for B12. Take a dedicated B12 supplement or consume B12-fortified foods. B12 deficiency can cause irreversible neurological damage and is particularly insidious because the body's stores can take years to deplete before symptoms appear.

Other safety notes
People with phenylketonuria (PKU) should avoid spirulina — it contains phenylalanine.
People with autoimmune conditions (multiple sclerosis, lupus, rheumatoid arthritis) should consult their GP before use, as spirulina may stimulate immune activity.
People on blood thinners (warfarin, aspirin) should consult their GP — spirulina has mild anticoagulant effects.
Avoid in pregnancy and breastfeeding without GP approval.
If you are taking any medication or under medical supervision, consult your GP before use.