Either all at once, or over a lifetime?
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How high?
It appears to be 0.1mg/kg of body weight too avoid coumarin overdose (which is much stronger in Cassia than ceylon cinnamon), which is toxic to the liver: https://ovidsp.dc2.ovid.com/ovid-new-a/ovidweb.cgi?T=JS&PAGE=fulltext&D=ovft&AN=01445481-201002000-00007&NEWS=N&CSC=Y&CHANNEL=PubMed