I come to this late, but I'm here. This is the first I've heard of this, but I don't find it surprising at all. Plant based extracts can be extremely powerful substances. I'm not familiar with lavender, but I have used tea tree oil as an adult for the suggested uses in the article and it had the desired effect. Many phytochemicals can actually outperform big pharmas offerings. Not too long ago I had severe and chronic pain. I'm using a tea made from wild lettuce and for the past 3 (?) weeks I've been pain free. Big pharmas pain killers are quite dangerous, potentially addictive, and with major side effects. The active ingredients in the tea have no side effects that I have noticed. Then there is saw palmetto which works great for an enlarged prostate. Kratom is another herb that works for many things and for myself, works just as good as wild lettuce as a pain reliever. But wild lettuce grows wild everywhere in north America and kratom doesn't. Cascara sagrada is an excellent remedy for constipation and is sometimes given to the residents of retirement homes as an everyday "mover". I could go on and on.
It's like anything, one needs knowledge before entering into the use of a substance. Yes, just because something is natural does NOT mean safe. The internet is a great source of knowledge about the use of herbs and extracts/oils for the use in home based medicine.
Many plants have led big pharma to cures for various things. Foxglove is poisonous (and natural) but the poison in it led to the discovery of digitalis. The list of phytochemicals that have led to the production of Rx is endless. Clover seed was or is the source of warfarin, a rat poison and also used today in a very dilute form as a blood thinner. Morphine comes from the opium poppy. With the legalization of medical marijuana we're finding that it can be used to alleviate many medical conditions. Again, the list is endless.
So no it comes as no surprise to me.
Brian. Lover of SE razors.