Evidence supporting the use of: Spirulina
For the health condition: Heavy Metal Poisoning

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Spirulina, a blue-green algae, has been investigated for its potential role in supporting the removal of heavy metals from the body. Scientific interest in spirulina’s chelating properties stems from both in vitro and animal studies, as well as a handful of small human trials. Spirulina contains compounds such as phycocyanin and polysaccharides, which are thought to bind heavy metals, thereby potentially reducing their absorption and promoting excretion.

A notable small clinical study published in 2006 in Food and Chemical Toxicology examined children from areas contaminated by arsenic in Bangladesh. The combination of spirulina (250 mg/day) and zinc (2 mg/day) for 16 weeks showed a statistically significant reduction in arsenic levels in participants’ urine and improvement in skin manifestations compared to controls. Animal studies have also indicated that spirulina supplementation may reduce oxidative stress and tissue damage associated with heavy metal exposure (e.g., lead or cadmium) by enhancing antioxidant capacity.

However, while these findings are promising, the overall evidence base remains limited. Most human studies are small, lack rigorous controls, and often use spirulina in combination with other chelators or nutrients. Therefore, while there is some scientific support for spirulina’s use in heavy metal detoxification, the evidence is not robust, and further well-designed human clinical trials are needed to confirm efficacy and safety.

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