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Spirulina (Hawaiian)

Whole-food greens · iron · antioxidant

Moderate evidenceVegan151 studies on PubMedRead the research
Written to our editorial standards · reviewed against published research· Updated 30 May 2026
Last reviewed: May 30, 2026

Spirulina: Whole-food greens · iron · antioxidant. Blue-green algae with a remarkable nutrient profile: B vitamins, iron, GLA, and the antioxidant pigment phycocyanin. Standard dose 3 g (6 tablets), taken in the morning, about $18/month. Evidence rating: moderate evidence.

Where to buy

Nutrex Hawaii Spirulina Pacifica 500mg
Recommended
Nutrex, Spirulina
3 g (6 tablets) · Morning · ~$18/month

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All product options

Nutrex Hawaii Spirulina Pacifica 500mgBestseller
Spirulina Pacifica 500mg
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400 tablets · $32 · ★ 4.8
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California Gold Nutrition SpirulinaBest Value
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240 tablets · $16 · ★ 4.6
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What is Spirulina?

Spirulina is a blue-green microalga (Arthrospira platensis) that has been consumed as a food since the Aztec civilization. It is one of the most nutrient-dense whole foods known: gram for gram, it provides exceptional levels of plant protein, B vitamins, bioavailable iron, gamma-linolenic acid, and the unique pigment phycocyanin, a potent antioxidant and anti-inflammatory compound. Hawaiian-grown spirulina (Nutrex's Spirulina Pacifica) is widely considered the cleanest source. Clinical studies suggest benefits for blood lipid profiles, iron status in deficient populations, and exercise endurance. Standard doses are 3-10 g daily, taken in tablet form to avoid the strong taste.

Blue-green algae with a remarkable nutrient profile: B vitamins, iron, GLA, and the antioxidant pigment phycocyanin.

Natural food sources

Where possible, get Spirulina from whole foods first. Common dietary sources include:

Spirulina (whole algae)Blue-green algaeGreen smoothie blends

Best for your goal

Interactions

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Common questions

What is Spirulina?
Spirulina is a blue-green microalga (Arthrospira platensis) that has been consumed as a food since the Aztec civilization. It is one of the most nutrient-dense whole foods known: gram for gram, it provides exceptional levels of plant protein, B vitamins, bioavailable iron, gamma-linolenic acid, and the unique pigment phycocyanin, a potent antioxidant and anti-inflammatory compound. Hawaiian-grown spirulina (Nutrex's Spirulina Pacifica) is widely considered the cleanest source. Clinical studies suggest benefits for blood lipid profiles, iron status in deficient populations, and exercise endurance. Standard doses are 3-10 g daily, taken in tablet form to avoid the strong taste.
What is Spirulina used for?
Whole-food greens · iron · antioxidant. Blue-green algae with a remarkable nutrient profile: B vitamins, iron, GLA, and the antioxidant pigment phycocyanin.
What is the standard dose of Spirulina?
3 g (6 tablets), typically taken in the morning. Approximate cost is $18 per month.
How strong is the evidence for Spirulina?
Moderate evidence for its primary uses. See the full study list on the research page.

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