Two clinical drug interaction studies40,41 have been conducted using SLO. One was conducted in 16 healthy volunteers who were administered SLO 160 mg/d for 11 days in a double-blind, randomized, placebo-controlled, crossover fashion.40 Various drugs were used for phenotyping effects on CYP enzymes, with no clinically relevant inhibition or induction found on CYP 1A2, 2C9, 2C19, 2D6, and 3A4 enzymes. The second was a double-blind, randomized, placebo-controlled, crossover trial conducted in 24 women taking oral contraceptives during two menstrual cycles.41 No changes in area under the curve or maximum serum concentration (Cmax) values of ethinyl estradiol or levonorgestrel were discovered, and there were no changes in secondary outcomes that may indicate impairment of oral contraceptive efficacy. However, the time to maximum concentration (Tmax) for levonorgestrel was slightly delayed. Although this may not be clinically significant in the use of daily oral contraceptives, efficacy of emergency contraceptives in which efficacy is critically time dependent could be impacted.41 Effects on glucuronosyltransferase have not been described.
I have bought dozens of essential oils from Piping Rock. Their prices are simply the best, especially considering the free shipping and “Crazy Deals” they offer and change almost daily. You can get 15 ml of 100% neroli oil for about $15, and it’s lovely! They also have a 15 ml bottle of 100% West Indian sandalwood for $39.95, and it smells GREAT. A 15 ml bottle of 100% pure cistus oil is about $13 or $14. It can’t be beat! Many of the normally cheaper oils (peppermint, orange, cedarwood, tangerine, tea tree, pine etc.) are wonderfully priced too -almost a steal. Their rose, jasmine and tuberose blends did not disappoint scent-wise (they weren’t too weak at all). Their oils come in glass bottles with stoppers and pretty labels. I was scared at first because of how cheap their prices are, but I’m glad I took the chance. On top of the great products, they ship SUPER FAST, package well, and my orders are always complete and correct. So happy with this company. Lastly, by signing up with the http://www.mrrebates.com website (it’s free), and accessing piping rock from there, you will get a %10 discount on your purchase, which you eventually receive as a refund in cash that you can have added to your PayPal account. I’ve earned over $50 in refunds! I’ve seen this % go up and down by a little from time to time, but the average is 10% (which it is as of today, 5/8/14). Maybe wait for a “free shipping day” and try some of the cheaper oils to test the waters first. Even when you have to pay for shipping (for orders under $40), the shipping is a flat $3.95 rate!
Most of us need to watch how much we spend. It’s very tempting to buy essential oils from the companies that sell them for the lowest price. Price alone isn't an indication of quality, but it can be. Knowledgeable vendors that spend countless hours locating quality oils, pay the expensive fees to test their oils (refer to the links available towards the bottom of the page to learn more about essential oil testing) and provide the results to customers and provide free samples upon request should rightfully be charging more for their oils than retailers that stock oils that they've sourced from the cheapest sources.

Not all essential oils are created equally, though, and certain oils are thought to better target anxiety while others may have different benefits. "Just make sure any oil you use is completely natural, organic plant essence," says Gillerman. Essential oils are not regulated by the U.S. Food and Drug Administration, but you should look for options that are certified organic, says Gillerman. "It's your surefire way of making sure that you are getting an essential oil that is not diluted or polluted with a toxin or petrochemical."
Oil companies should be listing their horticultural status because it can let you know if the  oil is organic, wildcrafted, USDA certified organic, certified organic, etc. (and they can be a combination of more than one of those). For instance, cold pressed (not steam distilled) citrus essential oils like lemon & lime can be phototoxic as well, but steam distilled lime oil is not a problem.
It is very important to note that not all essential oils are safe to take internally. When in doubt, do not ingest it to be on the safe side. However, those that are will give a strong medicinal effect when taken internally. With that being said there are definitely some very strict precautions you must adhere to when taking essential oils internally since they are so strong. These are very important and not to be ignored.
Hi, I was wondering if anybody knows where I can get Korres organic essential oils. I bought a lavender and a geranium last year on vacation in Greece but it seems that they’re only sold there. I can’t find them anywhere on the internet which seems really odd. The quality was amazing and I really want to try the others and restock on the lavender and geranium. Please help!
Be precautious of suppliers that promote their essential oils as being "therapeutic grade" or "aromatherapy grade." There is no governmental regulating body that grades or certifies essential oils as "therapeutic grade" or "aromatherapy grade." (For more information, read the "Therapeutic Grade" and "Aromatherapy Grade" Essential Oils article.) Not all companies use these terms with any form of deception in mind, but some do. Therefore, it's important to understand the background behind this terminology and evaluate these suppliers based on other factors and the tips shown below.
Are they an eco-conscious company? One of the reasons I choose the essential oil (and herb) company that I use for my personal and business needs, is because of their sustainable practices. I am very passionate about being eco-friendly and when a business goes to such lengths to be a zero waste company as well as put time and money into other eco-conscious projects, I really have to take notice.
I bought frontier brand cinnamon flavoring at a health food store. Is this cinnamon considered an essential oil? It says to use a few drops in baking cookies, cakes and other recipes, or 2 Tbsp. in a quart in a quart of simmering water with cloves and cinnamon sticks for relaxation. I have been using 1/4tsp. to 1/2tsp and sometimes more several times a day on cereals, tea and other foods thinking it might help control my blood sugar which was edging up in the pre-diabetes range. Is it safe to be consuming this much (organic sunflower oil and cinnamon oil are the 2 ingredients listed on bottle) in this manner? 
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