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Spirulina for Health & Longevity

Created on 11/02/2026 – Quick Reference based on Evidence Review created using AI4L / Opus 5.5 – Audit

Spirulina, a blue-green microorganism sold as a protein-rich supplement, has been tested for blood fats, blood pressure and allergies. Small trials show modest drops in blood pressure, blood fats and weight, mostly in people with raised values; one combined analysis found no clear blood-fat effect. With healthy starting numbers, expected gain is small. Main risks: contaminated products, rare allergic reactions and reported autoimmune flares. It supplies no usable vitamin B12. (Full Review)

Protocol

Standard trial doses
1–8 g/day
Whole spirulina; trials used 1, 2, 4.5 and 8 g/day
Blood pressure focus
>3 g/day for ≥12 weeks
Whole algae; larger reductions in a meta-analysis
Single or split doses
Twice daily
Used in two trials; splitting intakes above 3 g/day may improve tolerance
Time to effect
Blood fats
8–12 weeks
Window in which trial effects appeared; lipid effects grew with duration
Blood pressure
Beyond 8 weeks
Reductions also held in hypertension and in adults over 50
Body mass index
≥12 weeks
Weight and waist fell in pooled trials

Benefits

Contraindications
  • Autoimmune disease (pemphigus, dermatomyositis, and other immune-overactivity disorders)
  • Known allergy to spirulina or phycocyanin
  • Organ transplant recipients and others on immunosuppressants
  • Phenylketonuria
  • Pregnancy and breastfeeding
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Key Interactions
  • ACE inhibitors (enalapril, lisinopril): additive blood pressure lowering
  • Metformin: additive glucose lowering
  • Exercise training: additive lipid benefit
  • Laboratory tumor-marker tests: falsely high CA 19-9 results
    •
Theoretical (inferred from mechanism)
  • Immunosuppressants (tacrolimus, cyclosporine): weaker immunosuppression
  • Other antihypertensives (amlodipine, losartan): low blood pressure and dizziness
  • Sulfonylureas and insulin (glipizide, glimepiride): low blood sugar
  • Anticoagulants and antiplatelets (warfarin, clopidogrel): possible added bleeding
  • Lipid-lowering drugs (atorvastatin, ezetimibe): larger LDL fall
  • Over-the-counter antihistamines (cetirizine, loratadine): additive symptom relief
  • Over-the-counter iron supplements (ferrous sulfate, iron bisglycinate): excess iron in people with iron overload
  • Immune-stimulating supplements (chlorella, echinacea): higher autoimmune flare risk in susceptible people
  • Glucose- or blood pressure-lowering supplements (berberine, garlic): low blood sugar or low blood pressure when combined with drugs
    •

Risk & Side Effects

  • High:
  • Medium:
  • Low: Liver injury from contaminated products; autoimmune disease onset or flare; allergic reactions including anaphylaxis; mild gastrointestinal and nonspecific symptoms; vitamin B12 inadequacy when used as a B12 source; rhabdomyolysis; neonatal hypercalcemia after maternal use
    •
  • Speculative: Microbial and heavy-metal contamination
    •

Monitoring

Marker Target Why
LDL cholesterol <100 mg/dL Main lipid effect
Triglycerides <150 mg/dL Expected to change
Blood pressure <120/80 mmHg Expected to change
Fasting glucose <100 mg/dL Expected to change
ALT and AST ALT 7–56 U/L; AST 10–40 U/L Safety check: contamination-related liver injury
Vitamin B12 with MMA B12 200–900 pg/mL; MMA <0.4 µmol/L Safety check: inactive B12 analogs can mask deficiency
Hemoglobin Men 13.5–17.5 g/dL; women 12.0–15.5 g/dL Expected to change (rose in one trial)
Ferritin Not specified in the ER Paired with hemoglobin; plasma iron fell in one trial
Creatine kinase 30–200 U/L Safety check only with unexplained muscle pain

Cadence: Baseline before starting; lipids, glucose markers, blood pressure and liver enzymes at 8–12 weeks, then lipids, glucose and blood pressure every 6–12 months; home blood pressure or glucose readings in the first 2–4 weeks alongside antihypertensive or glucose-lowering drugs; creatine kinase only with unexplained muscle pain.

Qualitative Assessment

  • Allergy symptoms (nasal congestion, sneezing, itching), especially through a pollen season
  • Energy levels and perceived mental and physical fatigue
  • Exercise tolerance and recovery
  • Gastrointestinal comfort (nausea, bloating)
  • Warning signs: new rashes, blistering, muscle weakness, dark urine or yellowing of the skin
Not medical advice. Educational distillation of a single evidence review. Confirm any decision with a qualified clinician, especially in the presence of prescription drugs or chronic conditions.