Limited evidenceGeneral health

Marine Phytoplankton

Cultured micro-algae (usually Tetraselmis chuii or Nannochloropsis) sold for energy and recovery. A handful of small exercise trials are positive, but most come from the same research groups working with the ingredient supplier.

Evidence last reviewed: August 2026

What the science says

Exercise recovery and muscle damage Limited evidence
Two small randomised trials from the same group reported lower markers of muscle damage and better sustained performance across repeated exercise bouts. Both combined a human arm with animal mechanistic work, and neither has been independently replicated.
Antioxidant enzyme expression and aerobic capacity Limited evidence
A randomised crossover trial in healthy adults found that Tetraselmis chuii supplementation raised skeletal muscle antioxidant gene expression and peak oxygen uptake. It was a small crossover study using a proprietary extract.
General "energy" and nutrition claims Limited evidence
Marketing presents phytoplankton as a complete nutrient source. At the doses sold, the amounts of protein, omega-3 and micronutrients delivered are nutritionally trivial, and no trial has tested fatigue or nutrient status as an outcome.

Dosage & safety

Studied doseTrials of standardised Tetraselmis chuii extract used small doses in the tens of milligrams per day. Loose whole-cell phytoplankton powders are usually labelled at 1–2 g per day, a dose no study has tested.

SafetyGenerally well tolerated in short trials. Cultured micro-algae carry a lower contamination risk than wild-harvested algae, but iodine and heavy metal content vary by product. People with thyroid disease or shellfish/algae allergies should be cautious; no data in pregnancy or children.

Scientific references

Phytoplankton Supplementation Lowers Muscle Damage and Sustains Performance across Repeated Exercise Bouts in Humans and Improves Antioxidant Capacity in a Mechanistic Animal
Sharp M, Sahin K, Stefan M — Nutrients, 2020
Marine Phytoplankton Improves Exercise Recovery in Humans and Activates Repair Mechanisms in Rats
Sharp MH, Sahin K, Stefan MW — Int J Sports Med, 2021
Tetraselmis chuii Supplementation Increases Skeletal Muscle Nuclear Factor Erythroid 2-Related Factor 2 and Antioxidant Enzyme Gene Expression, and Peak Oxygen Uptake in Healthy Adults: A Randomised Crossover Trial
Cocksedge SP, Infante C, Torres S — Antioxidants (Basel), 2025

Where to buy

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