Spirulina supplement forms studied in human research
The strongest current support is for lipids Total Cholesterol LDL HDL Triglycerides Dyslipidemia. Other uses on this page have narrower, weaker, or not-yet-clear evidence.
What the research says
Each row is a different health effect. A means the support looks strongest, B likely helpful, C mixed or modest, and — not enough human evidence yet.
Papers are individual studies. Research reviews summarize evidence from multiple studies, such as systematic reviews and meta-analyses.
A · Strong evidence of benefit
A
Lipids Total Cholesterol LDL HDL Triglycerides Dyslipidemia
This is the best-supported use on this page. The evidence supports lipids Total Cholesterol LDL HDL Triglycerides Dyslipidemia more clearly than the other uses listed here, but not broader claims.
10 papers · 4 research reviews
B · Likely helpful
B
Blood Pressure Hypertension
The research suggests this may help with blood Pressure Hypertension in the studied settings. Broader claims would go beyond the evidence shown here.
5 papers · 2 research reviews
Safety
Safety is graded separately from benefits. Read these cautions first, especially if you take medication or have a medical condition.
✓ SafeNo clear harm signal in the human evidence reviewed.
✓
Side effects and tolerability
This is a safety note, not a benefit claim. It should not be read as a green light for every person or situation.
5 direct human studies
⚠ ConcerningThe human evidence points to a meaningful reason for caution.
⚠
Kidney-function cautions
This is a safety note, not a benefit claim. It points to a real reason for caution.
2 direct human studies
⚠
Medication and condition cautions
This is a safety note, not a benefit claim. It points to a real reason for caution.
3 direct human studies
Quick facts
A quick read on what this page supports right now.
Health effects reviewed
2 health effects reviewed
Best grade shown
A · Strong evidence of benefit
Benefits with support
2 uses currently show some level of supportive evidence
Safety rows
3 separate safety or caution rows
Research volume
14 unique research papers across graded uses on this page
What this means
Keep any benefit claims limited to the specific graded uses shown here.
Quality-verified products
Products that pass third-party quality testing.
Product quality data coming soon
Any future product listings should stay aligned with the specific graded outcomes and the separate safety rows shown here.
How we graded Spirulina
This page shows the current public rows for Spirulina:
14 unique research papers across
2 visible health effects. Safety rows are shown separately from benefit rows when available. The page includes
6 review-level papers and
9 direct human studies. Each supplement is graded by health effect using a certainty × effect matrix applied across PubMed evidence per health effect. Cochrane reviews and high-quality systematic reviews carry the most weight. See
Methodology
for full detail.