Turmeric and cinnamon are both notorious for lead contamination.
In many locations it's legal to sell consumables that have disgustingly high ppm of heavy metals as long as the recommended daily dose is small so that the absolute amount of heavy metals stays below a fixed threshold. Also many companies just flagrantly violate the regulatory levels.
Getting clean turmeric extract is possible by knowing which brand to trust. Natural Factors is trustworthy, they are transparent with heavy metal testing and have third-party validation in academic studies and by consumerlab.com. But even if it's clean, you would still need to manage this risk: https://www.ncbi.nlm.nih.gov/books/NBK548561
For cinnamon, avoiding coumarin is possible by making sure it's ceylon cinnamon. But I don't know of any brand selling ceylon cinnamon that I would also trust to have low heavy metal levels. The intersection of reliable brands and ceylon cinnamon sellers is a very sparse set.
> The acute hepatotoxicity caused by turmeric appears to be due to an idiosyncratic injury, perhaps immunologically mediated.
idiosyncratic means they don't know why (because they're idios?), but it happens to some people for unknown reasons. The chances are very slim that you'll have whatever pre-condition to be affected by this.
In many locations it's legal to sell consumables that have disgustingly high ppm of heavy metals as long as the recommended daily dose is small so that the absolute amount of heavy metals stays below a fixed threshold. Also many companies just flagrantly violate the regulatory levels.
Getting clean turmeric extract is possible by knowing which brand to trust. Natural Factors is trustworthy, they are transparent with heavy metal testing and have third-party validation in academic studies and by consumerlab.com. But even if it's clean, you would still need to manage this risk: https://www.ncbi.nlm.nih.gov/books/NBK548561
For cinnamon, avoiding coumarin is possible by making sure it's ceylon cinnamon. But I don't know of any brand selling ceylon cinnamon that I would also trust to have low heavy metal levels. The intersection of reliable brands and ceylon cinnamon sellers is a very sparse set.