Generic
Supplements, Certified Organic, Spirulina 1000 mg (Double Strength), Rich in Beta-Carotene (Vitamin A) and B-12 with naturally occurring GLA , 120 Tablets
- Quantity
- 120 count
- Potency
- 1000mg
$13.45$0.11/count
View product Supplement guide Probiotics
Spirulina
Spirulina is a protein-rich blue-green algae supplement. See what research shows on exercise, body weight and immunity, why its B12 is not reliable, and the contamination risks to check.
At a glance
Snapshot
- Primary goal
- Protein and mineral supplement (health benefits limited)
- Dosage range
- No standard dose is established; a 6 g daily dose was used in a 3-week trial
- Best time to take
- Not established in studies
- Time to effect
- Not established
- Common stacks
- Not studied
- Intake notes
- Spirulina contains phenylalanine, so people with PKU should ask a doctor first. Choose products with third-party tests for heavy metals and cyanotoxins.
Ranked picks
Top 3 Best Spirulina Supplements
Generic
Supplements, Organic Spirulina 500 mg with Vitamins, Minerals and GLA (Gamma-Linolenic Acid), 500 Tablets
- Quantity
- 500 count
- Potency
- 500 mg
$17.44$0.03/count
View product
Generic
Organic Spirulina Dietary Supplement, 2,000 mg per Serving, 30 Servings (120 Tablets), Supports Normal Immune and Inflammatory Responses*, Gluten Free, USDA Organic
- Quantity
- 120 count
- Potency
- 2,000 mg
$19.97$0.17/count
View productTop 10 Spirulina Supplements
Generic
Supplements, Certified Organic, Spirulina 1000 mg (Double Strength), Rich in Beta-Carotene (Vitamin A) and B-12 with naturally occurring GLA , 120 Tablets
- Quantity
- 120 count
- Potency
- 1000mg
- NootroScore
- 9.0
- Price
- $13.45$0.11/count
Generic
Supplements, Organic Spirulina 500 mg with Vitamins, Minerals and GLA (Gamma-Linolenic Acid), 500 Tablets
- Quantity
- 500 count
- Potency
- 500 mg
- NootroScore
- 8.6
- Price
- $17.44$0.03/count
Generic
Organic Spirulina Dietary Supplement, 2,000 mg per Serving, 30 Servings (120 Tablets), Supports Normal Immune and Inflammatory Responses*, Gluten Free, USDA Organic
- Quantity
- 120 count
- Potency
- 2,000 mg
- NootroScore
- 8.3
- Price
- $19.97$0.17/count
Generic
Premium Spirulina and Chlorella Capsules 1,250 Tablets, Non-GMO, Vegan Organic Chlorella Tablets, Sunlight Grown, Cracked Cell Wall, High Protein, Heavy Metal Detox
- Quantity
- 1,250 count
- Potency
- N/A
- NootroScore
- 8.3
- Price
- $19.99$0.02/count
Generic
Chlorella Spirulina Powder Capsules Organic 3000 mg of BMAA Free Purest Blue Green Algae - Best Natural Detox Raw Vegan Vitamins Protein Green Superfood - Made in USA
- Quantity
- 3000 mg
- Potency
- 3000 mg
- NootroScore
- 7.9
- Price
- $22.87$0.19/count
Generic
Organic Spirulina Tablets, Premium Spirulina Supplement, Rich in Prebiotics, Protein & Antioxidants | 3000 mg Per Serving, 720 Tablets
- Quantity
- 720 count
- Potency
- 3000 mg
- NootroScore
- 7.8
- Price
- $24.99$0.03/count
Generic
Organic Spirulina Supplement, 3000MG Per Serving, 720 Tablets (4 Month Supply), No Filler & Non-GMO, Rich in Vegan Protein, Vitamins & Prebiotics, Premium Spirulina Pills
- Quantity
- 720 count
- Potency
- 3000MG
- NootroScore
- 7.6
- Price
- $25.99$0.04/count
Generic
Organic Chlorella Spirulina Tablets, 3000mg Per Serving, 720 Counts, 4 Months Supply, 50/50 Blend Superfood, No Filler, No Additives, Cracked Cell Wall, Rich in Vegan Protein & Chlorophyll
- Quantity
- 720 count
- Potency
- 3000mg
- NootroScore
- 7.2
- Price
- $29.99$0.04/count
Generic
Spirulina Capsules – Concentrated Plant Protein Supports Immune Health & Cardiovascular Function – Vegan, Kosher, Gluten-Free – 180 Capsules
- Quantity
- 180 count
- Potency
- N/A
- NootroScore
- 7.1
- Price
- $31.00$0.17/count
Hawaii
Hawaii, Pure Hawaiian Spirulina 500 mg, Vegan, Supports Immune System, Heart, Cells and Energy, 400 Tablets
- Quantity
- 400 count
- Potency
- 500 mg
- NootroScore
- 7.1
- Price
- $30.99$0.08/count
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Frequently Asked Questions
Common questions about Spirulina answered by our experts
- What does spirulina contain?
- A 2024 review reports that protein makes up 50-70% of spirulina's dry weight, and that it is rich in minerals such as iron. It contains vitamin B12, but the bioavailability and activity of that B12 are debated.
- Can spirulina help with weight loss?
- A little, on average. A 2025 meta-analysis of 17 randomized trials found spirulina reduced body weight by 1.07 kg, a small effect. It is not a standalone weight-loss tool.
- Does spirulina boost exercise performance or energy?
- Not shown. In one 3-week trial of 20 healthy adults taking 6 g a day, VO2 and other performance measures at simulated altitude did not change.
- Does spirulina remove heavy metals from the body?
- That has not been shown. The risk runs the other way: poorly tested products can contain heavy metals and cyanotoxins, so buy products with third-party testing.
- Is spirulina safe?
- A 2024 review calls spirulina generally considered safe for human consumption, while noting that trials still need to validate its safety. Human safety data are limited, and contaminated products are a risk. People with PKU should ask a doctor first, since spirulina contains phenylalanine.
- Can spirulina interact with medicines or autoimmune conditions?
- Specific interactions are not established in the sources reviewed. The effect of spirulina on autoimmune disease is not established either. Ask a doctor before combining spirulina with prescription drugs or if you have an autoimmune condition.
Sources
- Karkos PD et al. Spirulina in clinical practice: evidence-based human applications. Evid Based Complement Alternat Med 2011 (PubMed 18955364)
- Spinola MP et al. Chemical composition, bioactivities, and applications of Spirulina (Limnospira platensis). Foods 2024 (DOI 10.3390/foods13223656)
- Gurney T et al. Spirulina supplementation during lactate threshold exercise at simulated altitude: a randomized controlled trial. J Int Soc Sports Nutr 2025 (PubMed 40310870)
- Lak M et al. Effects of spirulina supplementation on body composition in adults: a dose-response meta-analysis of RCTs. Nutr Metab 2025 (PubMed 40528207)
- Rajput S et al. Health risks of cyanotoxin contamination in dietary supplements. Food Chem Toxicol 2026 (PubMed 42874982)