Burns physiology
- Hypermetabolic response:The post-burn hypermetabolic state is one of the most severe in all of medicine. Resting energy expenditure increases 50–100% above predicted (Harris-Benedict) within 48 hours, driven by elevated catecholamines, cortisol, glucagon, and pro-inflammatory cytokines. This state persists for 6–12 months post-injury in major burns and can last years in severe cases. Early enteral nutrition within 6 hours of injury reduces the hypermetabolic magnitude.
- Protein catabolism:Nitrogen losses in major burns (>40% total body surface area) can reach 40–50 g/day — representing 250–300 g of muscle protein. Daily protein requirements in major burns are 2–3 g/kg/day, far exceeding normal requirements (0.8 g/kg/day).
- Zinc loss:Wound exudate from burn wounds is exceptionally high in zinc — up to 300 µg/kg body weight/day in major burns. Serum zinc consistently falls <50 µg/dL post-burn (normal 70–120 µg/dL). Zinc is required for wound collagen synthesis, immune function, and epithelialisation.
- Oxidative stress:Free haemoglobin and haem released from thermally destroyed red blood cells activate NADPH oxidase and Fenton chemistry, generating a massive oxidative burst. Antioxidant reserves (vitamins C and E, glutathione) are rapidly depleted.
Spirulina mechanisms in burns
Protein
Spirulina at 10 g/day provides 6 g protein — a modest contribution to the 130–200 g/day required in major burns. It is not a replacement for enteral/parenteral nutritional support in major burns but is relevant during later rehabilitation (months post-injury) when oral intake is established but nutritional demands remain elevated.
Zinc
Spirulina provides approximately 0.5–1.5 mg zinc per 10 g — against a post-burn therapeutic zinc requirement of 20–40 mg/day (zinc supplementation is standard burns care). Spirulina zinc is a supplementary contribution rather than a sole source; dedicated zinc supplementation (zinc gluconate, zinc sulfate) remains necessary in major burns.
Phycocyanobilin and oxidative stress
- Haem-driven NOX2 activation (as in sickle cell disease) is directly relevant to the post-burn oxidative environment — phycocyanobilin inhibits this specific NOX2 isoform
- Animal burn models show phycocyanin reduces lipid peroxidation markers and organ dysfunction indices post-burn — suggesting systemic antioxidant activity in the burns context
- No clinical trial in burn patients. This is a mechanistic extrapolation.
Iron
Iron status in major burns is complex:
- Acute haemolysis releases large amounts of iron from destroyed red cells — temporarily elevating serum iron and ferritin
- Later in recovery (weeks to months), iron deficiency develops from blood loss, ongoing wound exudate, and increased demands for haemoglobin synthesis during erythropoietic recovery
- Check ferritin and transferrin saturation at 4–8 weeks post-injury before introducing spirulina iron; in the acute phase, iron supplementation may not be appropriate due to elevated free iron driving oxidative stress
Vitamin C in burns context
Burns care uses high-dose vitamin C (ascorbic acid, 66 mg/kg/hour for 24 hours post-burn in some protocols) to reduce fluid resuscitation requirements and oxidative stress. In the rehabilitation phase, vitamin C at standard doses enhances spirulina’s iron absorption 3× — relevant as iron deficiency is a later-phase concern.
Practical guidance
- Acute burns (hospital/ICU phase): nutrition is managed by burns dietitian; do not introduce supplements without burns nutrition team approval
- Rehabilitation phase (>6–8 weeks post-injury, established oral intake): spirulina at 5–10 g/day contributes protein, zinc, and phycocyanin to ongoing elevated nutritional demands
- Check ferritin at 4–8 weeks; if iron deficient (ferritin <30 µg/L), spirulina iron with vitamin C is appropriate
- Continued zinc supplementation at therapeutic doses is required alongside spirulina — spirulina zinc alone is insufficient