If anyone else is wondering, the only somewhat concise explanation I found was this[0]:
> Non-toxic is essentially a placebo term and unlike food-safe or food-grade products, has little to no government regulation in terms of its accuracy. [...]
> What non-toxic means is that the product contains no ingredients that have been linked to toxic responses in humans. Toxic responses are things like hormone disruption, poisoning, or cancer.
> Non-toxic is essentially a placebo term and unlike food-safe or food-grade products, has little to no government regulation in terms of its accuracy. [...]
> What non-toxic means is that the product contains no ingredients that have been linked to toxic responses in humans. Toxic responses are things like hormone disruption, poisoning, or cancer.
[0] https://www.greenmatters.com/p/does-non-toxic-mean-food-safe