Phycocyanin

What the trials found

Phycocyanin does not have established benefits for human health outcomes; current evidence is limited to early laboratory research rather than clinical supplementation trials.

1 papers
0 of 9 outcomes

Risk, worst reported severity

bruising mild
bleeding gums (gingival bleeding) mild
sodium salicylate minor

Protocol

Dose, timing & forms

How much

There is no established, evidence-backed human dose for isolated phycocyanin. The available evidence is too limited to connect a specific amount, duration, or product to reliable benefits in people. 1 Do not assume that a large dose of spirulina delivers the same amount of purified C-phycocyanin used in experimental research. 1

When and how long

No human trial protocol establishes a best time of day, meal pairing, or split-dose schedule for phycocyanin. 1 If you choose to use it, follow the product label rather than treating it like an as-needed pain or inflammation product, since that use lacks human dosing evidence.

Forms & standardisation

Look for a label that identifies the ingredient as C-phycocyanin and states the amount per serving, rather than relying on a vague "blue spirulina" claim. The key experimental finding concerns isolated C-phycocyanin, not a specified spirulina dose or a consumer product standard. 1 Third-party identity and contaminant testing matter because algae-derived ingredients vary substantially between products.

Safety events

bruising mild

bleeding gums (gingival bleeding) mild

Drug interactions

sodium salicylate minor decreases effect

In context

What this is and how it works

One laboratory paper examined cyclooxygenase-2 inhibition, with no human participants or clinical effect estimate reported.1
The evidence base reviewed here contains 1 paper spanning 9 outcomes, without an established human dose.
Laboratory enzyme findings do not establish symptom relief, disease prevention, or safe self-supplementation in people.

Phycocyanin is a blue, light-catching protein from spirulina, a type of cyanobacteria often sold as blue-green algae. Researchers isolate it from spirulina to study its biological activity, but concentrated phycocyanin is not interchangeable with every spirulina powder. 1

In early laboratory work, C-phycocyanin inhibited cyclooxygenase-2, an enzyme that helps cells produce inflammatory chemical signals. 1 Think of that enzyme as a signal amplifier: phycocyanin appears to turn down the amplifier in a lab setting, but human studies have not yet shown how much that changes how you feel.

Bottom line

Phycocyanin is interesting if you are curious about an early-stage spirulina compound, not if you need a supplement with proven symptom benefits. The evidence rests on limited laboratory research, with no established human dose or outcome. 1 Skip self-experimenting if you bruise easily, have bleeding gums, or use products that affect clotting.

Frequently asked

Common questions

What is phycocyanin?

Phycocyanin is the vivid blue protein pigment found in spirulina. Early lab work focuses on its ability to affect cyclooxygenase-2, an enzyme involved in inflammatory signaling. ¹

Does phycocyanin reduce inflammation?

Early laboratory findings show that C-phycocyanin can inhibit cyclooxygenase-2 activity. ¹ That does not yet establish a meaningful reduction in inflammation, pain, or other symptoms in people.

Does phycocyanin thin the blood?

Clotting-related effects remain too poorly studied in people to treat phycocyanin as a blood-flow supplement. Given reports of bruising and bleeding gums, use extra caution if you already bleed easily or use products that affect clotting.

Sources

1. Selective inhibition of cyclooxygenase-2 by C-phycocyanin, a biliprotein from Spirulina platensis (2000) ↑

Generated August 27, 2026

Adverse events and drug interactions

Sources