Many essential oils are steam distilled, which involves simmering the plant material to produce steam, which travels through a tube, which is then run through cold water. The liquid that forms from condensation will be in two parts, a water compound, and an oil compound. The water compound is where floral waters, such as lavender and rose water, come from. The oils that rise to the top are DIY essential oils.

Dry the plant material. Drying reduces the amount of oil in each plant, but can greatly increase how much essential oil you make per batch. This is because you’ll be able to fit more material into each batch. Drying should be done slowly and away from direct sunlight.[5] Commercially grown plants such as lavender and peppermint may be allowed to dry in the field after cutting for a day or so.
According to a systemic review and meta-analysis published in Pain Research and Treatment, there is a significant positive effect of aromatherapy, compared to placebos or control treatments, in reducing pain. Researchers evaluated 12 studies on this topic and found that essential oils were especially helpful in treating postoperative pain, obstetrical pain and gynecological pain. (14)
In fact, the benefits of diffusing essential oils into the air are one of the main reasons I’m loving these essential oil recipes. When you apply heat to essential oils, many studies show it can actually denature many of the most important chemicals and compounds, so you are essentially just diffusing the oils for scent, and not for the beneficial aspects.

Essential oils extracted from plants (literally taking the “essence” of the scent and flavor of the plant or herb) have been used for medicinal and wellness purposes for centuries. Sometimes the benefits come from rubbing the oils into the skin but they can also be added to warm baths or misters to inhale for aromatherapy benefits. Depending on the oil, they can be used to ease headaches or muscle pain, help with emotional issues like anxiety and stress. Some oils (such as peppermint, lavender, and lemon) have more than one purpose and can be blended, so we checked out kits that cover the basics. When choosing, make sure these collections include any personal favorites. We also looked for oils that are naturally derived rather than having gone through a chemical process. This ensures they are purer and less diluted, with authentic aromas to create a pleasing scent to ease your aches and pains — or, just to make bath time into a spa ritual.  
For respiratory support. Frankincense is a powerful health support for respiratory problems such as asthma, chronic obstructive pulmonary disease, pneumonia, and bronchitis. It even helps when suffering from laryngitis. Diffuse it into the room where you intend to spend some time. For best results, use an ultrasonic cool mist diffuser. Never heat essential oils, because heating them diminishes their therapeutic effects.
Some essential oils have sedative properties, which can be helpful for people who are having trouble falling asleep or sleeping through the night. Lavender oil, in particular, is known to be an effective sleep aid because of its ability to leave you feeling relaxed and calm. Some other oils that can be used to promote restful sleep include Roman chamomile, ylang ylang, bergamot and vetiver.
Pour the oil into a container for storage as quickly as possible. Most essential oils can be kept for at least one or two years, but some have very short shelf lives.[8] To maximize the useful life of your oil, keep it in a dark glass bottle or stainless steel container. Use a clean funnel to pour the oil into the container, and make sure the container is clean before pouring the oil into it. Store it in a cool, dark place.[9]
Pour the oil into a container for storage as quickly as possible. Most essential oils can be kept for at least one or two years, but some have very short shelf lives.[8] To maximize the useful life of your oil, keep it in a dark glass bottle or stainless steel container. Use a clean funnel to pour the oil into the container, and make sure the container is clean before pouring the oil into it. Store it in a cool, dark place.[9]
What is an essential oil? Typically created through the process of distillation — which separates the oil and water-based compounds of a plant by steaming — they are highly concentrated oils that have a strong aroma. In fact, sometimes they are called volatile aromatic oils because of their high concentration of the aromatic compounds. (1) They also are simply called aromatherapy oils.
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