BioOptimal Organic Spirulina Tablets are single-ingredient, 100% USDA Organic spirulina, a nutrient-dense blue-green algae. Each 500 mg tablet is pure spirulina with no fillers, binders, or additives. Available in 120 or 240 count, they are vegan, gluten-free, non-GMO, and third-party tested for heavy metals, giving you a clean source of complete plant protein, antioxidants, and B vitamins to support energy and daily nutrition.

What is spirulina?

Spirulina is a blue-green algae, a type of cyanobacteria that grows in fresh and saltwater, and one of the most nutrient-dense superfoods available. It is a complete plant protein with all nine essential amino acids, plus iron, B vitamins, carotenoids, antioxidants, and phycocyanin, the blue-green pigment unique to spirulina. BioOptimal uses 100% USDA Organic spirulina pressed into 500 mg tablets with nothing added, so each tablet is pure spirulina. Organic sourcing helps keep it free from the contaminants sometimes found in conventionally grown algae.

What spirulina supports

People take spirulina for everyday energy, daily nutrition, and antioxidant support. As a complete plant protein, it is popular with vegans, vegetarians, and athletes who want a clean source of amino acids. Its iron and B vitamins support energy, while its antioxidants help the body manage free radicals. The vitamins and minerals in spirulina, including iron, also support healthy hair. Benefits build with consistent daily use rather than overnight.

Why BioOptimal spirulina

BioOptimal spirulina is made for purity. It is one ingredient, 100% USDA Organic spirulina, with no fillers, binders, preservatives, or additives, and it is vegan, gluten-free, and non-GMO. Most important for any algae, every batch is third-party tested for heavy metals, since spirulina can absorb contaminants from low-quality growing water. Our tablets give accurate, consistent dosing in a convenient form. BioOptimal is US-based, BBB-accredited, and made in a GMP-certified facility, so you get spirulina you can trust.

How to take

Take the daily serving listed on the label, about four 500 mg tablets, with water. Each 120-count bottle is a 30-day supply, and the 240-count is a 60-day supply. If you are new to spirulina, start with a lower amount and increase gradually. Tablets give accurate dosing and avoid the strong taste of spirulina powder.

Spirulina vs chlorella

Spirulina and chlorella are both microalgae and pair well together. Spirulina is higher in protein and phycocyanin and is often used for energy, while chlorella has a cracked cell wall and is known for chlorophyll and detox support. See the superfoods collection to compare or take both.

Frequently Asked Questions

1. What is spirulina?

Spirulina is a blue-green algae (a cyanobacteria) that grows in fresh and saltwater. It is considered a superfood because it is a complete plant protein with all nine essential amino acids, plus iron, B vitamins, antioxidants, and phycocyanin.

2. What is spirulina good for?

Spirulina is used to support everyday energy, antioxidant intake, and daily nutrition. As a complete plant protein, it is popular with vegans and athletes. Its iron and B vitamins also support energy and healthy hair.

3. What do spirulina tablets do?

Spirulina tablets provide a concentrated, convenient dose of spirulina's protein, vitamins, minerals, and antioxidants. They offer accurate dosing without the strong taste of powder and support energy, daily nutrition, and a plant-based diet.

4. What does spirulina taste like?

Spirulina has a strong, earthy, slightly oceanic flavor. Taking it as a tablet avoids most of that taste. If you use powder instead, blending it into a smoothie or juice helps mask the flavor.

5. How much spirulina should I take per day?

Follow the serving on the label, about four 500 mg tablets daily with water. If you are new to spirulina, start lower and increase gradually. Most people take it once a day, and consistency matters most.

6. Is BioOptimal spirulina organic and tested for heavy metals?

Yes. It is 100% USDA Organic, single-ingredient, and non-GMO. Every batch is third-party tested for heavy metals, which is especially important for spirulina because algae can absorb contaminants from poor-quality growing water.

7. Is it safe to take spirulina every day, and are there side effects?

For most healthy adults, daily spirulina is considered safe. Some people notice mild digestive changes when starting. Those who are pregnant or breastfeeding, have an autoimmune condition or PKU, take blood thinners, or are allergic to seafood or algae should consult a healthcare provider first.

8. Can I take spirulina and chlorella together?

Yes. Spirulina and chlorella are commonly taken together because their nutrients complement each other. You can take them at the same time with water. A bundle is available if you want both.