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Dr. David Hill

Dr. David K. Hill, Chief Medical Officer

A leading expert in the essential oils industry, Dr. Hill is head of the doTERRA Scientific Advisory Board.

Many of doTERRA's oils are certified organic, others are ECOCERT, and some have no certification. This is because we source from so many developing countries. Certification requirements and availability vary from country to country. Some countries do not even have certification offerings.
When we say our oils are better than organic, it is because we have the ability to see even the smallest component in each batch of oil. If there is anything in the essential oil that was not naturally produced in the plant without anything added, it is rejected. That's what I love about our Certified Pure Tested Grade process. We work with the best analytical scientists in the world – nothing escapes them!

The value of an essential oil is derived from more than its individual chemistry. How that chemistry develops and to what extent it evolves within the plant are other important considerations. Moreover, manufacturing processes can sometimes enhance or reduce subtle but critical chemical components needed for optimal health benefits. For doTERRA, it is not a single expert or singular process that determines best practices for quality, but rather a multi-faceted cooperative effort that includes experts working together for the best possible results. This unique and distinctive approach consistently allows doTERRA to offer unparalleled quality and benefit in our essential oils.

The chemical constituents of an essential oil are analogous to the macronutrients in food. Just as the fructose (sugar) composition of a banana provides instant energy and has specific metabolic effects, an essential oil rich in Limonene can provide a powerful boost to your immune system. The chemical constituents in an oil determine its potential benefits, what metabolites it will produce, and best ways for application.
Chemists to date have identified more than 3,000 different molecules in essential oils. Each of these compounds of carbon, hydrogen and oxygen atoms have their own unique properties. These compounds are categorized based on their chemical makeup, which refers to their function and physiological activity. Oils high in terpenes (ending in “-ene”) have different properties from those high in hydroxyl alcohols (ending in “-ol”) or phenols or esters and are therefore suitable for different purposes. Familiarity with the chemical building blocks of essential oils enables each user to practice aromatherapy more safely and effectively.

A base oil is a lipid-based substance used to dilute essential oils.
The most popular base oils are pure vegetable oils, including grapeseed, avocado and almond oils; however, the most readily available base oils can go rancid rather quickly. I prefer fractionated coconut oil because it is stable at all temperatures and in all environments. It is also non-aromatic and therefore does not alter the aromatic properties of essential oils. Many people mistakenly believe that using base oils somehow reduces the effectiveness of the essential oil, when in fact there are many benefits of diluting oils. Dilution increases the surface area of absorption, improves absorption by dry skin and prevents sensitivities. It is never wrong to dilute, especially when using oils with more potent chemistry. Determining when and how to dilute is a personal decision that should be based on preferences for use, oil chemistry and personal sensitivity.

For many, the value of essential oils is understood and validated through personal use. It may not be a question of which oil to use but rather determining how and how much oil to use. The three primary methods of use include aromatic, topical (on the skin) and internal application, all of which have documented benefits. Individual preference and experience will help you select the most appropriate application method to meet your personal needs. Although models of use may vary, I have found that consistent application is most effective. I recommend using essential oils in smaller amounts and more frequently throughout the day rather than sporadically in large amounts. Consistency of use will help ensure a lasting effect and that ensures maximum benefit.

Much information is available about essential oils and their biological activity in the body. We understand more about the physiological mechanisms of essential oils than ever before. We know that essential oils are lipid soluble and therefore easily absorbed by skin tissue and mucous membrane. The safety and effectiveness of each application method is well validated by scientific evidence. When determining how to apply an essential oil, it is important to use the oils in a context that is comfortable for the user. Although the effects may be less pronounced by certain application methods, each application method has powerful benefits, both locally and systemically.

It is a common false assumption that when we use essential oils, we can only affect the body or the mind but not both. In reality, when we affect a system of the body, the effects extend systemically. The limbic system, also known as the body's emotional control center, is crucial when it comes to aroma because it is so easily influenced by our environment. What we taste, what we see, what we hear and especially what we smell influences this system. Part of the limbic system is the hypothalamus, which, in addition to regulating the limbic system, has direct links to neurochemical stimulation throughout the body. So if we inhale the scent of Lavender, it will not only calm our mood, but will benefit the whole body. By far the quickest way to benefit from the effects of essential oils is to use them aromatically, but no matter how we apply the oils, the effects will be far-reaching.

A great advantage of essential oils is that they are safe and effective at every stage of life, including pregnancy. Because of the mild, non-irritating nature of many essential oils, they can be used confidently at this time. An important consideration during pregnancy is to support healthy full-body function. Frankincense supports cellular function and improves overall health. * In my experience, Ginger, Peppermint, Lavender and citrus oils can help relieve pregnancy-related issues such as nausea, emotional imbalance, and other common discomforts. * It is also important to remember that during pregnancy, many women are particularly sensitive. Adjustment of quantity, application methods or dilution ratios may be necessary to accommodate these increased sensitivities.

Just as we can classify essential oils based on differences in chemistry, we can categorize them based on their aroma. Three main aroma groupings are: calming/soothing oils, stimulating oils and grounding/balancing oils. What is interesting, however, is that we cannot separate the aroma from the chemistry. When we look at oils that are stimulants, we observe the interplay between the aroma and the chemistry that allows these oils to affect the body systemically.
Diffusing a stimulating oil during the winter months can boost mood and can also be stimulating to other body systems. Essential oils that fit into this category are those with different top notes such as Basil, Lemongrass, Peppermint, Eucalyptus and all citrus oils. One of my favorite combinations is Wild Orange mixed with Peppermint. These oils are most effectively used in a diffuser or by application to the skin.

An allergy is the result of the immune system misidentifying a substance as harmful and creating antibodies to fight it, resulting in various side effects. An allergic reaction to a plant is caused by the protein-containing materials of a plant (i.e., the actual seed, leaf or fruit). Pure essential oils do not contain these complex molecules, which are the main cause of allergies. Although an allergic reaction is unlikely, this does not mean that one can use essential oils irresponsibly without risk. Understanding the proper use of an essential oil is always recommended, regardless of the circumstances. If you are concerned about sensitivities or interactions with other treatment plans, consult your doctor or health care provider for additional guidance.