What the rule actually says
This entry is a stub: the status and review dates are set, and the body is written against primary sources before publication.
What this page will not tell you
We publish no dosing figures
You will not find a spoon count, a weight, a volume or a "start with this much" anywhere on this site, and that is a deliberate editorial rule rather than an oversight.
Grayanotoxin content varies between batches by more than an order of magnitude, so any figure we printed would be wrong for most jars and dangerous for some. A figure that is wrong in the direction of "more" is the exact failure mode that fills the case reports.
There is no established safe amount. Published poisoning cases involve small quantities, and the only people who should be advising you about your own body are clinicians who can see your history.
Related countries
Canada
No named prohibition. General food law applies federally, with a provincial enforcement layer on top.
United States
No federal rule names it. FDA food-safety authority reaches it as any other food, and import is subject to inspection.
Australia
Food standards treat naturally occurring toxicants directly, and import by post is prohibited.