I do have one BIG complaint about do-terra and it has nothing to do with the quality of their oils. They tell their young impressionable (and unlearned) people that their oils are so pure that they can be mixed with food, beverages, or put in capsules for anti-biotic use. Lets get two things straight here, “Antibiotic properties” are not the same as an “anti-biotic” and if you actually did ingest enough EO to actually do what they profess they can do, it would probably kill you as it would be so toxic.
I assumed this was just standard competition stuff that we've seen before with other big brands in Corporate America. Then I read this article on LearningAboutEOs.com last summer that showed 'proof' from a third party lab that there were synthetic compounds found in several large and small essential oil companies. I highly recommend you read this in its entirety.
Anjou Top 12 Essential Oils Set is an aromatherapy medicine chest and beauty box in one. Lavender, Sweet Orange, Tea Tree, Eucalyptus, Lemongrass, Peppermint, Bergamot, Frankincense, Lemon, Rosemary, Cinnamon, and Ylang-Ylang Essentials Oils can be used with a carrier oil for soothing, healing skin and hair, digestion, headache and congestion relief, and massage therapy. Used with a diffuser or humidifier, the calming or invigorating fragrances create stress-relieving home and office atmospheres
You seem to be a bit touchy about research. I would suggest that you go to PubMed and search for “essential oils.” You will definitely find some scholarly research that has been published on the subject….but not nearly enough. (If you need a comparison, do a search for your favorite pharmaceutical drug). Given that publications are the currency for academic research, this would suggest that there aren’t as many researchers studying these essential oils as you seem to think.
One of the keys to producing the highest quality essential oils is to have the highest quality growing conditions for the plants prior to extraction. For that reason, ZEVA focuses on sourcing our plants from indigenous regions where the growing conditions are ideal for the plants, rather than trying to force them to grow in a non-native, less hospitable environment. Our team works with suppliers from around the world to find the highest quality ingredients to go into every essential oil we produce.
Processing: Because of the growing popularity of essential oils and aromatherapy, there are many products on the market that may not be suitable for clinical use. They can be found nearly everywhere, from health food stores to discount stores to the Internet. These products may include pure essential oils, but sometimes they are adulterated or diluted. Such adulterations are difficult to identify.

Infants, toddlers, and young children are more sensitive to the potency of essential oils and safe dilutions generally range from 0.5 - 2.5% depending on the condition. Certain essential oils should either be avoided, used in highly diluted form under the guidance of a knowledgeable professional, or included as a minor percentage in a professionally-formulated essential oil blend. For example, special caution should be exercised with potentially toxic essential oils such as Birch and Wintergreen which are both high in methyl salicylate, Eucalyptus which is high in 1,8 cineole and Peppermint which is high in menthol. Elderly clients may have more skin sensitivities so a reduced concentration/dilution may be indicated.
Of course aromatic materials were used in Biblical times for various medicinal, religious and ceremonial purposes but these materials would not have been essential oils, at least not by todays definition of being steam distilled products. This would have been impossible given that steam distillation had not yet even been discovered! Most people attribute the discovery of true steam distillation to a Persian scientist named Avicenna (Ibn Sina) in the 11th century. There was certainly no steam distillation over 2300 years earlier in King Tut’s time. Aromatic products used during these ancient times would have been of a crude solvent extracted nature using fats and pressed oils and the like and would not have been very concentrated (not to mention that extracted products yield very different chemistry than distilled products) and therefore their use cannot really be related to how we should use the steam distilled essential oils of today.
Now, for the rest of the story. Yes its true that isolated individual molecules are universally the same regardless of who are what synthesized them. But this in no way means that essential oils can be re-constructed, molecule by molecule, in a lab. The reason this would be virtually impossible is because of the vast complexity of essential oils. Essential oils are almost always a collection of hundreds of molecules when you look at all the minor and trace components. The problem becomes infinitely more complex when you consider that almost every one of those components has an enantiomeric form to worry about as well. So, for example, while peppermint oil consists of 40-50% menthol and 99%+ of the menthol is the L form, there is also a small amount of its mirror image (D-menthol) in there as well. Not to mention that menthol has not one, but 3 chiral carbon atoms, so when you consider all of the diastereomers (things like iso-menthol, neo-menthol, neo-iso-menthol) along with their mirror images, there are a total of 8 menthol isomers to worry about! And this is just the molecular system of menthol (one out of close to hundred different compounds in peppermint) trying to exactly recreate the correct ratios of every enantiomer and/or diastereomer of every molecule in an essential oil would be a monumental task that is basically impossible from a practical standpoint.
Exotic Ylang Ylang elicits feelings of deep, languid calm, and is thought to heighten the senses. The striking yellow flowers of the Ylang Ylang tree yield an excellent quality oil. Among its varieties, Ylang Ylang Extra is considered as the best grade due to its unsurpassed fragrance and value in aromatherapy. It has an intoxicating sweet fragrance with musty top notes.
First let me say if you are using terms like "first pressing" then you've really got some catching up to do on your essential oil education. Most all essential oils are steam distilled, in fact this is inherent to the very definition of an essential oil. The only oils that are considered to fall under the definition of the term "essential oil" and are not produced by steam distillation are the citrus oils, which are cold pressed from the citrus peel (and if its done properly there would not be any oil left in the peel for a second pressing LOL). So when one refers to the so called "first pressed" essential oils they does not even portray an accurate method of production of almost every essential oil out there, since almost every oil is produced by distillation, not by pressing. Please avoid this "pressing" terminology unless you want to just sound like a complete novice to the field. When the pressed method is applicable, in the industry we use the terms COLD PRESSED or EXPRESSED to describe the production of citrus oils (some citrus are also distilled but that’s another issue). So this brings us to the whole issue of the claimed "multiple distillations" of the same plant material. Consider this quote from a popular blog:
I had psoriasis for years & kept on getting different creams & lotions from the GP but none of them worked. So 1 day I read up fully on the EO’s I had for cleaning & making face masks. I made myself a blend of oils, carrier oils, butters, vit E & I mixed that with some bees wax to make a balm. I couldn’t believe it within a week it had started to work. I thought I might of just been me getting less stressed so it es going on its own but I’ve since given the blend to 2 friends who suffer from psoriasis badly whom also couldn’t get any help from the GP. Now they both call it a miracle oil & have told me I should sell it. However I would like to do an aromatherapy course first so I could make other blends to help people & I have no idea on selling my products, so I’d have to look into that as well.
One example of oil that shows some evidence of effectiveness is tea tree oil, which may be an effective treatment for acne, according to the NIH. In one clinical trial, researchers compared gel containing tea tree oil to a benzoyl peroxide product, and found that the benzoyl peroxide worked slightly better but that the tea tree oil had fewer side effects, according to the NIH.

Although highly fragrant, concretes contain large quantities of non-fragrant waxes and resins. Often, another solvent, such as ethyl alcohol, is used to extract the fragrant oil from the concrete. The alcohol solution is chilled to −18 °C (0 °F) for more than 48 hours which causes the waxes and lipids to precipitate out. The precipitates are then filtered out and the ethanol is removed from the remaining solution by evaporation, vacuum purge, or both, leaving behind the absolute.