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Riboflavin 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.
Riboflavin is one of the safest food additives. It is an essential nutrient with no established upper tolerable intake limit due to its extremely low toxicity — excess riboflavin is simply excreted in urine (which turns bright yellow). No carcinogenicity, teratogenicity, or mutagenicity has been identified.
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