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Although cilantro is the top recommended essential oil for heavy metals, my favorite is celery seed oil. Other favorites are carrot seed oil, parsley oil, green mandarin, tangerine and cinnamon.
doTERRRA has fabulous cilantro, green mandarin, tangerine and cinnamon. I have to get the carrot, celery and parsley oils from another supplier for now, but because I know that the quality is less than doTERRA's, I don't want to recommend the source. But you could email me for more info at ericabeready@gmail.com.