Phycocyanobilin / Spirulina

ID: phycocyanobilin_spirulina

Aliases: PCB, phycocyanin chromophore, Arthrospira, blue spirulina

Type: compound

Route/form: oral spirulina/phycocyanin food or supplement context

Status: dietary_component_or_supplement

Evidence level: human RCT

Best data tier: human controlled/review

Support scope: human, review/regulatory

Source types: meta_analysis, review

Linked sources: 3

Broad outcomes: Cardiovascular / lipids / blood pressure, Fat loss / metabolic health, Gut / immune / inflammation, Longevity / mitochondrial / redox

Reading note: These are curation notes anchored to linked sources, not a clinical recommendation or protocol.

Targets / mechanism

• bilirubin-like tetrapyrrole redox biology
• NADPH oxidase inhibition hypothesis
• phycocyanin/spirulina cardiometabolic effects

Optimization domains

• metabolic
• cardiovascular health
• blood pressure
• lipids
• redox
• inflammation
• anti aging
• natural product

Research basis

• PCB has a coherent bilirubin-like/NADPH oxidase mechanism literature, and spirulina has human meta-analysis support for modest cardiometabolic endpoints.
• It is relevant to the Gilbert-syndrome/bilirubin discussion because PCB is a biliverdin/bilirubin-adjacent tetrapyrrole from spirulina/phycocyanin.

Limits, risks, and missing evidence

• Human evidence is mostly for spirulina products, not purified PCB, so the mechanistic attribution is not clean.

Risk flags

• standardization uncertainty
• mechanistic attribution uncertain
• limited purified compound human data

Linked papers, labels, and reviews

1. Clinical potential of Spirulina as a source of phycocyanobilin
   review / pubmed_spirulina_phycocyanobilin_2007
   Mechanistic review proposing spirulina/phycocyanin as a practical phycocyanobilin source with bilirubin-like NADPH oxidase/redox rationale.
2. The Bioactivities of Phycocyanobilin from Spirulina
   review / pubmed_phycocyanobilin_bioactivities_2022
   Review of PCB antioxidant, NADPH oxidase, anti-inflammatory, and disease-model mechanisms.
3. Effects of spirulina supplementation alone or with exercise on cardiometabolic health in overweight and obese adults
   meta_analysis / pubmed_spirulina_cardiometabolic_meta_2025
   Human systematic review/meta-analysis of spirulina cardiometabolic endpoints; does not isolate purified phycocyanobilin.