lf you are interested in the chemistry behind essential oils, this is for you. It not only talks generally about essential oils, but there are quite a few references to individual oils. It will show the oil name, Botanical name, Oil uses and body system effected, and Suggested methods of use.

Essential Oil Chemistry Handbook

To Dilute or Not Dilute... that is the question.

Is neat (undiluted) application more effective?

Carrier oils, such as Fractionated Coconut Oil, help trap volatile compounds which minimizes evaporation and enhances penetration through the skin.

Large molecule carrier oils (argan oil, rose-hip oil, jojoba oil, ...) are greasy and do not absorb well. They are used to provide a layer of protection on your skin.

Small molecules, like water, absorb too quickly and do not protect/trap essential oil volatiles.

Medium-chain triglycerides of Fractionated Coconut Oil absorb well and protect essential oil volatiles from evaporating.

Topical application is great, especially using massage. It stimulates the dilution of blood vessels resulting in improved skin absorption of volatile compounds.

Here's a short article from doTERRA with even more information.

I just can't say enough about this great oil. 
THC comes from the cannabis or hemp plants. It is completely illegal in about half the US and legal for at least medical purposes in the other half.
CBD oil from hemp contains only trace amounts of THC and is legal in all 50 states. It does not make you high but it does help with neurological issues, pain and more by indirectly interacting with CB2 receptors in the body.
BCP, caryophyllene, is a cannabinoid found in very high levels in doTERRA’s Copaiba and it interacts DIRECTLYwith CB2 receptors. When taken internally, the BCP in Copaiba possesses strong antioxidant properties, promotes healthy cellular function,  may help support immune function while supporting overall circulatory health, and may help support the health of the gastrointestinal tract and colon. Additional research has shown that Copaiba essential oil (with all its constituents) may help keep the mouth, teeth, and gums clean and healthy looking. Topically applied Copaiba oil may also help keep the skin clean and clear while helping to reduce the appearance of blemishes.  Another interesting experimental research study found that Copaiba taken internally may help to support uterine health and ease menstruation.*
CBD vs Copaiba oil. Copaiba is ..

• Much less expensive than CBD
• 100% drug free with zero risk of containing THC and 100% legal
• Not from the cannabis plant so using Copaiba has 0% chance of affecting a drug test
• DoTERRA does more testing than any other company in the world. So you know it is free of pesticides, heavy metals and contaminants.

I found this at Best Healthy Advice and thought I'd share.

How to Treat Hormonal Imbalance Naturally
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Lavender oil- this essential oil balances the hormones and it can lower minor pain caused by abdominal cramps during menstruation. It will also soothe stress and feeling of discomfort which is very common during PMS.
Thyme oil – this oil has a positive effect onto the progesterone production. When the levels of this hormone are low, the risk of depression and infertility are much higher.
Clary sage oil – in a study done in 2014, this oil lowered the level of cortisol, the stress hormone, by 36% and increased the thyroid hormone levels.
Lemongrass oil – the compounds in lemon peels, present in this essential oil as well, have the power to better the functioning of the liver, hormone production, and to reduce the liver cholesterol.
Sandalwood oil – it will balance the testosterone in women and men and better the hormonal levels in the body.
Myrtle oil – this essential oil betters the thyroid activity and balances the functioning of the ovaries.
Basil oil – This essential oil successfully boosts the body’s natural response to both physical and emotional stress. Researchers have discovered that the daily use of basil extracts reduce the general stress symptoms, such as exhaustion, sleep issues, and forgetfulness.
How to Use Them to Treat Hormonal Imbalance
Mix coconut oil and some of the essential oils mentioned above and rub different body areas to better the absorption.
For an improved hormonal balance, mix 2 drops of clary sage oil and 2 drops of lavender oil.
To soothe PMS symptoms, soak in bathwater mixed with 2 drops of lavender and 3 drops of clary sage.