Current regulatory evaluations and toxicological reviews conclude that dietary exposures to saccharin are non-carcinogenic in humans, noting that rodent-specific bladder tumor mechanisms lack human relevance.
The provided papers include recent safety evaluations and comprehensive reviews (such as the 2024 EFSA re-evaluation and the 2025 review on non-sugar sweeteners) which explicitly support the safety and non-carcinogenic nature of saccharin at dietary dosages in humans, noting that older rodent findings operate through mechanisms inapplicable to humans. There are no papers refuting this specific claim among the provided sources.