PlainPill
SupplementAnxietyEnergyRecovery

Spirulina

People mainly take Spirulina for anxiety, energy, recovery. Based on 43 first-hand reports and 52 meta-analyses & systematic reviews in the medical literature. Ranked #400 of 1,974 overall.

Compare with…Alternatives for anxiety
30
User score
Mostly positive
21% positive0% mixed5% negative74% unclear

Of reports that state an outcome, 81% are positive.

Clinical research
AStrong research base
52
meta-analyses
83
RCTs
3,676
papers

What Spirulina does, according to users

Of the people who reported each effect, the share who said it got better.

Anxiety100% of 1Energy100% of 1Recovery100% of 1Weight loss100% of 1
betterno changeworse

What the research says

Systematic reviews and meta-analyses from PubMed, with their published conclusions.

AStrong research base

3+ meta-analyses or systematic reviews and 10+ randomized controlled trials in humans. The grade measures how much human research exists — read the conclusions below for what it found.

Pharmacol Res · 2023 · Meta-analysis / systematic review
Comparative effects of nutraceuticals on body weight in adults with overweight or obesity: A systematic review and network meta-analysis of 111 randomized clinical trials

Conclusion: Supplementations with green tea (MD: -1.25 kg, 95%CI: -1.68, -0.82) and glucomannan (MD: -1.36 kg, 95%CI: -2.17, -0.54) demonstrated small weight loss, also the certainty of evidence was rated low. Based on our findings, supplementations with nutraceuticals can result in a small weight loss in adults with overweight or obesity.

PubMed 37778464 ↗

Dosage people report

As stated by users — not a recommendation. Follow the label or your doctor.

2 g2x daily
3 g2x daily
30 tablets2x daily
1 tspas reported
15 gas reported
1-8gdaily

Reported side effects

How often each side effect came up across all reports.

headache ×1

What users say

Verbatim quotes, shortened only — each links to the original discussion.

“Kratom 4g + Spirulina 2g”
Source discussion ↗
“Spirulina - 3g twice per day for neuroprotective benefits”
Source discussion ↗
“30 Algae Tablets from Energy Bits”
Source discussion ↗
“Just take some spirulina and call it a day then.”
Source discussion ↗
“I would bet that the ones that I take (Phenylalanine, Spirulina, P5P, Rhodiola) effect my biology in such a way that supports non-compulsive behavior.”
Source discussion ↗
Top discussions (5)

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User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 2, 2026. How we rate