Spirulina
Spirulina (Arthrospira)
A nutrient-dense blue-green algae with complete protein, antioxidants, and immune-supporting properties.
Spirulina is a blue-green algae (cyanobacteria) that has been consumed for centuries and is considered one of the most nutrient-dense foods on Earth. It contains 60-70% complete protein, B vitamins, iron, and unique compounds like phycocyanin (the blue pigment with potent antioxidant properties). Research shows benefits for cholesterol, blood pressure, blood sugar, and allergies. It's also a sustainable protein source.
Mechanisms of Action
Phycocyanin
Powerful antioxidant blue pigment
Immune Modulation
Enhances immune cell activity
Nutrient Density
Complete nutrition in small package
Recommended Dose
3-10g daily
Loading: Start with 1g and increase gradually
Optimal Timing
- With food to mask taste
- Morning for energy
- Before meals for appetite effects
Take with food
Best Form
Powder or tablets
Alternatives: Capsules (avoid taste), Flakes
Powder is most economical but has strong taste. Tablets/capsules avoid taste issue. Ensure quality sourcing to avoid contamination.
Duration
Minimum: 4 weeks
Optimal: 12 weeks
Cycling: Not required
Note: Strong taste is easier to mask in smoothies or capsules. Can turn drinks blue-green.
Personalized Dosage Calculator
Get a dosage recommendation tailored to your body weight, age, goals, and health profile.
Set up your health profile for personalized recommendations
Improved Cholesterol
Reduced LDL and triglycerides
Allergy Relief
Reduced allergic rhinitis symptoms
Antioxidant Protection
Reduced oxidative stress
Strong Taste
Distinctive algae/seaweed flavor
Excellent protein source; note B12 is not bioavailable form
Who Should NOT Take This
- Autoimmune conditions (may stimulate immune system)
- Phenylketonuria (PKU) - contains phenylalanine
Drug Interactions
May counteract immunosuppressive effects
Contains vitamin K; monitor — may affect platelet aggregation or vitamin K-dependent clotting factors, altering anticoagulant efficacy
Possible Side Effects
Tip: Start with small dose; take with food
Tip: Usually from detox; start low and increase slowly
Warnings
- Source matters - can be contaminated with heavy metals or microcystins
- B12 in spirulina is largely inactive pseudovitamin
- May worsen autoimmune conditions
Top studies from 40+ peer-reviewed papers
Jurek JM et al. • Nutrients (2025)
“Further research is needed to validate these effects and ensure their safety in MASLD management.”
Key Findings:
- Background: Metabolic dysfunction-associated steatotic liver disease (MASLD) has become one of the most prevalent liver diseases, affecting up to 40% of adults and strongly associated with obesity and metabolic dysfunction.
- Liver enzymes improved following consumption of WGPs, BJ, sour tea, flaxseed oil, and garlic, and hepatic steatosis was reduced after intake of oranges, WGPs, HFBs, BJ, flaxseed powder, rapeseed oil, and garlic powder.
- Conversely, a solely fruit-rich diet (FRD) had negative effects across all outcomes.
- Conclusions: Plant-based foods improved metabolic outcomes, with WGPs, HFBs, beetroot, oranges, sour tea, flaxseed oil, and garlic providing specific benefits for liver health.
Pinto-Leite M et al. • Nutrients (2025)
“Conclusions: Further randomised trials are needed to better assess the potential of these supplements as adjuvants for the control of cardiovascular risk factors.”
Key Findings:
- On the other hand, Spirulina intake led to a significant reduction in diastolic BP (-0.42, 95% CI: -0.81 to -0.02, p = 0.04) but did not significantly affect lipemia indexes, despite a trend toward a reduction in total cholesterol (-0.17, 95% CI: -0.39 to 0.06, p = 0.15).
- This meta-analysis suggests Spirulina supplementation can be used as an adjuvant to control cardiometabolic risk factors, particularly for BP.
- However, the magnitude of this effect is small and of uncertain clinical significance.
- Conclusions: Further randomised trials are needed to better assess the potential of these supplements as adjuvants for the control of cardiovascular risk factors.
Casas-Agustench P et al. • Journal of human nutrition and dietetics : the official journal of the British Dietetic Association (2025)
“Consuming over 3 g/day of whole edible algae, especially Spirulina, for at least 12 weeks significantly lowers BP, particularly in those with elevated levels.”
Key Findings:
- Edible algae intake significantly reduced systolic BP (SBP: -2.05 mmHg; 95% CI: -3.80, -0.31; p = 0.022) and diastolic BP (DBP: -1.87 mmHg; 95% CI: -3.10, -0.64; p = 0.001).
- Heterogeneity was high for SBP (Q-value: 230; I2 = 75%; p < 0.001) and moderate for DBP (Q-value: 102; I2 = 68%; p < 0.001).
- Consuming over 3 g/day of whole edible algae, especially Spirulina, for at least 12 weeks significantly lowers BP, particularly in those with elevated levels.
- This suggests that edible microalgae may serve as a natural approach to managing hypertension, complementing pharmacological treatments.
Bayo Jimenez MT et al. • International journal of molecular sciences (2025)
“Despite generally favorable results, the studies varied considerably in design and quality; nonetheless, herbal extracts represent a prominent category of natural interventions in AD and MCI, underscoring the need for further large-scale, high-quality clinical trials to confirm their therapeutic potential.”
Key Findings:
- These extracts showed potential cognitive and neuroprotective benefits, although results varied across compounds and study designs.
- Other natural compounds-including flavonoids, polyphenols, omega-3 fatty acids, Aloe vera, Spirulina, and citrus phytochemicals-may provide cognitive and neuroprotective benefits, with ginseng and Ginkgo biloba combinations also showing promise.
- Curcumin and Melissa officinalis had limited effects, resveratrol showed mixed outcomes with some side effects, and matcha green tea may improve cognition and sleep quality.
Weiner JD et al. • Lupus science & medicine (2025)
“We identified 227 herbal supplements with immunostimulatory properties, of which 15 were most strongly supported by the evidence.”
Key Findings:
- We identified 227 herbal supplements with immunostimulatory properties, of which 15 were most strongly supported by the evidence.
- This article may serve as a reference to help clinicians counsel patients with autoimmune skin diseases on the risks associated with use of specific herbal supplements.
- Further research warranted to confirm findings
Study Type Distribution
Goals This Supplement Supports
Related Goals
This information is for educational purposes only and is not intended as medical advice. Always consult a qualified healthcare provider before starting any supplement.