GC / MS是氣相色譜/質譜，是用於分析精油的許多測試之一。
雖然許多精油用戶認為它是確定精油是否良好的必然方法，但它有許多缺點。依靠這種測試可能會導致很多問題。
與普遍看法相反，GC-MS測試並不能保證純度 本文引自
許多公司已經找到正確比例的添加劑和合成材料成功操作精油的方法，讓GC / MS測試結果看起來與一般無誤。
GC-MS測試不會顯示是否含了合成添加劑。
如果將合成的乙酸芳樟酯加入純薰衣草中，單獨的GC-MS分析無法確定該成分是合成的還是天然的，只是它是乙酸芳樟酯。
The other day a lady posted me on my Facebook and said, ”Well, this other company sends out their GC’s, how come Young Living doesn’t?”
I posted her back and said, ”Would you know how to read it if I did?”
Anybody can create anything they want with a GC. What if they spike their oil with a small amount of a strong synthetic chemical and then use only a single 30-meter-column GC? The chemical won’t show up!
So just having a GC printout is meaningless unless you’re an analytical chemist and know how to read it. So why would I waste all the paper just sending them out when no one would even have a clue how to read them? Is there anybody reading this who can look at a GC report and tell me what they’re looking at? I rest my case.
~D. Gary Young, Founder of Young Living http://www.dgaryyoung.com/blog/2014/requests-for-a-gc-ms-analysis/
D. Gary Young曾經發表一篇文章說，曾有一位女士問，為什麼別家公司可以公開GC/MS，而YL不行?
D. Gary Young回答: 如果我公開了，你知道要怎麼閱讀嗎?
任何有心人都可以用GC/MS去創造出他們想要的東西，少少量的化學合成物品是無法在GC/MS裡面被呈現出來的
除非你是分析化學家且知道怎麼閱讀他，要不然只是印出他並沒有任何意義的。
之前一陣子芳療界曾經被檢驗出許多大公司的肉桂皮精油造假的問題
最後 Kurt Schnaubelt博士（與Young Living沒有任何關係）發布了一篇博文，旨在譴責業界如此重視GC / MS測試
事實上，這些分析似乎並不具代表與意義......因為數劇庫的誤差範圍，尤其是倍半萜稀複合物更是最難掌控的GC/MS訊息
Recent events surrounding potential adulteration of Cinnamon Bark oil from a large corporate supplier have inadvertently highlighted the problems associated with the overemphasis of instrumental analysis and especially GC/MS analysis, for proving the purity of essential oils.
We all have become so accustomed to the power of computation that we forget that there sometimes are sizable margins of error in the data that are generated. In our case the exclusive reliance on instrumental analysis and especially GC/MS has its own set of problems. The most overlooked issue is the way GC/MS are ran today...
I could go on and on about the idiosyncrasies and the potential for wrong conclusions in the process of interpreting GC/MS data... Most Mass Spec library setups are hopelessly over challenged when it comes to precise IDs for complex sesquiterpene mixtures. The take away message here is that even and especially computerized interpretation of the Mass Spectra of a GC/MS is not immune to delivering incorrect results.
To quite some degree the reliability of such interpretations is based on the quality of the library. I.e an operator who has analyzed EO for ten years and added and added specific EO components to her or his specific library will have a better chance than someone else who starts out with a store bought library of common chemical components.1
而反觀，YOUNG LIVING多年來測試精油的數據庫
有一套自己的數據資料庫，有更多的的數據可以解釋結果....最後還清白了YOUNG LIVING的檢測結果
最後
Schnaubelt博士總結道：
我可以無休止地討論這個問題，但足以說明，儀器分析是處理精油的一個非常有價值的工具，但是當涉及到對真正正確的油的鑑賞時，它永遠不會取代人類的元素。我的一位導師曾告訴我，確定真實性的真正方法是看到生長中的植物，蒸餾過程中仍然存在並且理想地存在，並從蒸餾器中獲取新鮮的樣品。
真正的能自己看到植物的生長狀態，蒸餾過程以及最新鮮的樣品，才是精油品質最重要的一環!
另外GC/MS並不是萬能的
他不能檢測精油是否是合成的
也不能檢測是否含重金屬
更不允許因為植物產地蒸餾/種植過程而引起的更多的天然療效的GCMS成分....(自己產地蒸餾的技術不同造成的差異讓植物療效更高)
放出GC/MS反而會讓人可以有依據而模仿YL的精油，制作出假的成分的特殊精油...
這更是我們所不樂見的~
幾年前，Young Living的鼠尾草中的香紫蘇醇含量如此之高，以至於其他人質疑它是合成的。但真正發生的事情是Young Living的蒸餾廠在一次蒸餾快樂鼠尾草中停止工作，經過一些實驗，是時勢YOUNG LIVING擁有比其他任何人都提取更多香紫蘇醇的方法。因為YOUNG LIVING擁有自己的蒸餾廠。
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