Are your Essential Oils pure?

Adulteration: the willful and purposeful addition of cheaper oils, oil fractions, by-products, isolates, natural and/or unnatural synthetics, to reduce the cost of the oil. Essential oils are becoming more and more popular with the general consumer. As holistic and natural health trends increase, people are becoming more interested in aromatherapy and essential oils and their benefits. I can remember 15 years ago trying to find chamomile essential oil and having to finally mail order for it. Now, the consumer has a reasonable expectation to find most common essential oils in their local heath food store, aromatherapy shop or even local mall. With rising popularity often confusion follows. Aren't all essential oils the same? Well they should be, but sadly, the adage caveat emptor is best followed. Because essential oils are, depending on the oil, comparatively expensive in small amounts, there exists the temptation to dilute them to make them go further. This is called adulteration.

Adulteration occurs in a number of ways. (i) Addition: invisible, where a vegetable or mineral oil is added to dilute the essential oil (EO) or visible, the addition of a constituent like alcohol, (ii) Mixture: with cheaper essential oils such as Rosemary EO being diluted with eucalyptus and/or white camphor oils, and (iii) Synthetic "nature identical" addition, such as when bergamot EO is adulterated with linalol and/or linalyl acetate. The only way to confirm if adulteration has occurred is through gas chromatography (GC) and manufacturers using essential oils should request an HPLC (liquid chromatography) test of the essential oils they are buying from their supplier to ensure strict compliance.

The reason for this is that the essential oils must be pure to provide the benefits that they promise and are expected. Adulteration can reduce and/or remove these properties and even introduce undesirable ones.

• EO's contain many powerful antioxidants
• Many EO's facilitate the release of endorphins
  
• EO's are often immune system stimulants
• Some EO's are natural chelators
  
• EO's are often antibacterial, antifungal, antiviral
• EO's can act as nutrient transport agents to cells
  
• Most EO's contain terpenes that are beneficial to cellular function
  

As a consumer, ask your supplier of essential oils or your favourite natural personal care products store if they are sure that not only are their oils natural, but free from adulteration. If you make your own natural bath and body products, check with your supplier. For further information and as a starting point, I have found AromaWeb interesting and useful.

Fruit Extracts

There has been a trend in the use of natural fruit extracts in shampoos and conditioners for a few years now, but more and more we are seeing them in soaps and other bath and body care products in lieu of perfumes and fragrances. With the notable exception of the citrus family, essential oils cannot be derived from most fruits. Those interested in natural body care products tend to shun fragrances because they are usually synthetically derived and until recently, if they wanted natural, they were often out of luck. If you are an ingredient list reader, look for parfum, perfume, fragrance - these are usually manufactured from artificial esters and not natural. Common esters used in the production of artificial fruit fragrances are ethyl butyrate and ethyl acetate. Ethyl butyrate is also sometimes added to orange juice - to make it more orange-like in flavour.

So, we have been left with the vast array of non-fruit essential oils like lavender and rosemary, among others, to scent our favourite soaps, shampoos and moisturisers. However, the industry has been inundated by consumer demand for not only fruit scents, but natural ones. Supercritical carbon dioxide extraction is the most natural way to isolate natural fruit extracts, which are becoming much more commonly used and available. And not only is the scent isolated, but often the polyphenols, vitamins and other anti-oxidants and phyto-chemicals are too, allowing the manufacturer the ability to impart those benefits and qualities.

Whether you use banana pineapple soap or traditional French lavender, make sure you check the ingredient list if you truly want natural. Just because the label has a pretty flower or picture of a fresher-than-life piece of fruit, doesn't mean that the contents are completely natural. Read labels, ask staff at your favourite bath and body store, contact manufacturers with your questions. Be real, be kind, be natural.

Essential Oil Extraction

It is pretty common in the bath and body products industry to go natural these days. One of the ways that companies have found successful is to eschew fragrances and perfumes, which are, by and large, synthetic and opt instead for essential oils. This results in not only a more natural end-product, but one that is often more delicately scented. However, before we can use essential oils in soaps, lotions, perfumes or other cosmetics, we have to extract them from the source plant, whether it be lavender, chamomile or vanilla. The extraction method has an effect on the essential oil - it can change it, or even contaminate it, in which case the claim of natural cannot be maintained.

There are a number of ways in which essential oils can be extracted. All, except expression are solvent based, however we will separate them out, and refer to the solvent method as using something unnatural, resulting in solvent residue.

Distillation refers to water or steam distillation. The base plant material is permeated with water and essentially boiled at 100 degrees C. Similarly in steam distillation, steam is injected, often under pressure to separate the essential oil from the plant material. This happens at temperatures above 100 degrees C. Because of this, constituents in the essential oils can often decompose into oxidative products. However, this process is considered to be natural and the yield is high, little is wasted.

Expression is often referred to as 'cold pressed'. Olive, coconut and avocado oils are often cold pressed. No heat is used, so volatile constituents remain unchanged. Yield can be low though, so this is often not a very efficient or cost effective method. There are several methods of expression that we won't go into here, but citrus oils are uniquely suited for this extraction method.

Supercritical CO2 is carbon dioxide above 31 degrees C and under extreme pressure (>72.9 atmospheres) that is used as a solvent. The supercritical CO2 bonds with the essential oil constituents in the plant material and extracts them. When the pressure is removed, the CO2 simply evaporates, leaving the pure essential oil. Since no heat is employed, the essential oil is unrefined and in its natural state. Often the scent, potency and crispness of the essential oil are enhanced as compared to steam and water distillates, scenting more closely to the original plant. While more expensive, the essential oil often goes further. The oils produced by this method are, like those extracted through expression, the purest and most natural.

Solvent extraction for our purposes here is where an organic, but not necessarily natural, solvent such as alcohol, petroleum ether or hexane (among others) is used. Often used because of cost effectiveness, it is also used for very delicate essential oils or where the essential oils are found in very minute quantities, such as rose or jasmine. This type of extraction produces a waxy substance called concrete. This concrete is then heated and dissolved into alcohol. This is then distilled in a vacuum, resulting in an absolute. Absolutes are generally very expensive. The problem for the natural community is that after extraction, quantities of the solvent may remain, often in large percentages. Hexane extraction leaves 8-10 ppm of hexane (a petrochemical) in the essential oil. This method is not viewed in the natural community as being natural and is avoided by those companies that are truly committed to natural products.

It is important to know the extraction method of an essential oil to determine not only its quality but if it can still be considered a natural product. Essential oils on an ingredient list do not guarantee natural and are often used in greenwashing exercises. The good news is that the demand for really natural products by consumers has opened up essential oils to serious scrutiny.

Is that Lavender or Lavender?

One of my favourite scents is lavender. I grow it in my garden and we have it in many different products here at Rocky Mountain Soap. It is one of the few essential oils that can be applied directly onto the skin. It has been called "blue gold", has sedative properties and is very relaxing. It is anti-microbial, antiseptic and anti-inflammatory. It is of course used in cosmetics, bath and body products and as a delightful fragrance in French cooking and chocolate. The nectar from the flowers also produces a deliciously scented honey. So, with this in mind, I thought I knew everything that I needed to know: all lavender is produced in France, it is easy to grow and all lavender is the same.

I was wrong on two of the three counts. Lavender is not exclusive to France. Eastern Europe is a major production area, and there are lots of lavender farms in BC - in the Okanagan, Vancouver Island and Salt Spring Islands, as well as in Sequim, WA just across the Juan de Fuca Strait. And while it is easy to grow at home, and you can get plants already started at your local gardening centre, be aware that not all lavender is created equal.

There are over 40 different species of lavender. English lavender (Lavandula augustifolia), the most sought after lavender essential oil, known for its delicate and subtle fragrance is the most common. However, Lavandin (L. x intermedia) a clone of a hybrid cross between English lavender (L. augustifolia) and Spike lavender (L. latifolia) is becoming more common because of its larger flowers, often deeper colour, much stronger scent and ease of cultivation. Indeed, it takes about 130kg of English lavender to produce 1 litre of essential oil versus 40kg of Lavandin flowers to get the same amount of essential oil. Lavandin is not true lavender however and is often referred to as 'Bastard Lavender'. It produces an essential oil, strong in camphor (about 6-8% versus the less than 1% composition in English lavender essential oil), and can be found more and more in large scale applications. While its flowers are beautiful, its essential oil is considered to be inferior to of L. augustifolia, lacking the subtle lavender scents associated with fine English lavender. I was wrong, not all lavender is created equal!