Spirulina Blue-Green Algae - Standardized

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Spirulina, also known as blue-green algae, is widely used to promote good daily health. But there's a lot of variation among products. Swanson Standardized Spirulina changes everything. The patented spirulina in this formula delivers 5% phycocyanin, one of the algae's most active components. This formula has the potential to support the immune system unlike any other spirulina supplement available.


Supplement Facts

Serving Size 1 Vegan Capsule

Servings Per Container 90

Amount Per Serving % Daily Value
Vitamin A (as beta-carotene) (from Spirulina)† 375 mcg RAE 42%
Vitamin K (from Spirulina)† 4 mcg 3%
Spirulina (Arthrospira plantensis) (microalgae) 500 mg *
Total Phycocyanin 50 mg *
Zeaxanthin 475 mcg *

Percent Daily Values are based on a 2,000 calorie diet.
*Daily Value not established.
†Typical Analysis (nutrients are naturally occurring).

Other Ingredients: Hypromellose (vegetarian capsule), rice flour, microcrystalline cellulose (plant fiber), magnesium stearate, silica.

Suggested Use: As a dietary supplement, take one vegan capsule two times per day with water.

Warning: For adults only. Consult your healthcare provider before using this or any product if you are pregnant or nursing, taking medication or if you have a medical condition.

Storage Instructions: Keep out of reach of children. Do not use if seal is broken. Store in a cool, dry place.




  1. What makes Swanson Spirulina different from regular spirulina?
    Swanson Spirulina is made with Arthrospira platensis microalgae and is standardized to deliver 10% phycocyanin, one of spirulina's most valuable antioxidant pigments. This standardized approach provides a consistent level of phycocyanin in every serving while supplying naturally occurring beta-carotene (vitamin A), vitamin K, and zeaxanthin to support overall wellness.
  2. What is phycocyanin, and why is it important?
    Phycocyanin is the blue antioxidant pigment naturally found in spirulina. It helps protect cells from oxidative stress caused by free radicals and contributes to spirulina's nutritional value. Swanson Spirulina delivers a guaranteed amount of phycocyanin to provide reliable antioxidant support and help support healthy immune system function as part of a balanced lifestyle.
  3. What nutrients does standardized spirulina provide?
    In addition to 500 mg of standardized spirulina, each serving provides naturally occurring beta-carotene (vitamin A), vitamin K, and zeaxanthin. These naturally occurring nutrients help support antioxidant activity, immune health, healthy vision, and overall cellular wellness. Spirulina is also valued as a nutrient-dense whole-food ingredient that complements a healthy diet.
  4. How does spirulina support immune and antioxidant health?
    Spirulina contains naturally occurring antioxidants, including phycocyanin, carotenoids, and other phytonutrients that help protect cells from oxidative stress. These compounds help support normal immune system function and overall cellular health, making spirulina a popular supplement for everyday wellness.
  5. Does spirulina contain protein?
    Yes. Spirulina is naturally rich in protein and contains all nine essential amino acids, making it a high-quality plant-based protein source. However, because the serving size in dietary supplements is relatively small, Swanson Spirulina is best viewed as a nutrient-dense superfood supplement that complements a healthy diet rather than serving as a primary source of daily protein.
  6. Is Swanson Spirulina suitable for special dietary needs?
    Yes. Swanson Spirulina is vegan, non-GMO, dairy free, and gluten free, making it an excellent choice for individuals with a variety of dietary preferences and restrictions. This formula features nutrient-dense Arthrospira platensis standardized to 10% phycocyanin and is free from animal-derived ingredients, dairy, gluten, and genetically modified ingredients. It provides plant-based antioxidant and phytonutrient support to help promote immune health, healthy vision, and overall wellness as part of a balanced lifestyle.