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Description
NIH LiverTox
3.5 = more than 30 leukocytes/HPF or focal microabscesses

Also, there is no research on safety in pregnancy or breastfeeding, so most sources advise against taking collagen during those times

Effects of camphorquinone on Cytotoxicity, cell cycle regulation and prostaglandin E2 production of dental pulp cells: role of ROS, ATM/Chk2, MEK/ERK and Hemeoxygenase-1 [J]
