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Vanillin 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.
Vanillin is considered safe at food use levels and has been consumed globally for decades. Some animal studies at very high doses have reported liver effects, but these are not relevant to typical human exposure. The FDA classifies vanillin as GRAS. For people avoiding petroleum-derived ingredients, synthetic guaiacol-based vanillin may be a concern, though it is chemically identical to the natural compound. Biotech-derived vanillin from lignin or fermentation is emerging as a more 'natural' alternative.
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