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Spirulina Extract is permitted by the US FDA. Several countries restrict, warning-label, or have reviewed it for safety concerns. The US has more lenient additive rules than the EU, UK, Canada, and Japan, which is why this ingredient remains widely used here.
Spirulina extract is safe at food coloring use levels. Spirulina as a supplement is generally well-tolerated; however, it can contain trace amounts of heavy metals and potentially hepatotoxic cyanotoxins if harvested from contaminated water bodies. Commercial food-grade spirulina extract is purified and subject to quality standards that minimize these risks. No adverse effects from spirulina-derived food coloring have been documented in peer-reviewed literature.
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