Talk:Oregano oil
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7571078/ Can add to the references for thymol when that section gets expanded.
https://www.ncbi.nlm.nih.gov/books/NBK591556/ Has details on liver toxicity, stating it unlikely to be toxic
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6152729/ Mentions different compositions for different Oregano species