How to use essential oils ? Benefits, precautions, uses and synergies
Essential oils are concentrates of powerful aromatic compounds, obtained by steam distillation of aromatic plants, rich in active principles. They have been used for centuries to treat oneself, but it is only in the last few decades that "modern aromatherapy" has allowed us to use them fully, in complete safety. The analysis of their biochemical composition and the properties of the aromatic molecules they contain have allowed researchers and therapists to specify the benefits and dangers of each essential oil and each chemotype.
Which essential oils for which use?
We often start by looking at essential oils when looking for a natural solution for a problem. Essential oils are indeed very versatile and can be useful in many cases. However, there are hundreds of them, with just as many possible uses, which may explain why it is sometimes difficult to get started with aromatherapy. For the same problem, many essential oils can be considered. The question that arises then is: which essential oil to use?
To answer this question, The company of the senses has set up a powerful tool giving all the essential oils useful for more than 200 health problems, with the most efficient and synergy proposals. It also allows to select the risks to exclude, the users and the desired way of use, to find the essential oil the most adapted to the situation.
Which essential oil for which use?
The 6 essential oils to have at home
There are hundreds of essential oils. On this page, we present 30 must-have aromatherapy essential oils. But if you've never used an essential oil in your life, we recommend starting with these 6 stars of aromatherapy: Tea Tree, Peppermint, Ravintsara, Petit Grain Bigarade, Fragrant Gautheria and True Lavender.
The essential oil of Tea Tree
Effective in fighting many infections, Tea Tree essential oil is broad spectrum antibacterial and antifungal, antiviral, immune stimulating, antiprotozoal & antiparasitic.
- Latin name: Melaleuca alternifolia (Maiden & Betche) Cheel.
- Distilled part: leaves
- The most effective in case of : Acne, Mycosis, Skin infections, Angina, Digestive infection
The essential oil of Ravintsara
Perfectly suited for the whole family, Ravintsara essential oil is a very effective antiviral and immunostimulant on the ENT sphere, essential to get through the worries of winter.
- Latin name: Cinnamomum camphora (L.) J.Presl.
- Distilled part: leaves
- The most effective in case of : ENT viral epidemic, Flu, to boost Immunity
The essential oil of Peppermint
Queen of the digestive sphere, Peppermint essential oil is a must-have in aromatherapy. The menthol it contains gives it powerful analgesic, stimulating and anti-microbial properties.
- Latin name:Mentha x piperita L. var piperita.
- Distilled part: Tops
- The most effective in case of : Headache, Migraine, Bad breath, Nausea.
The essential oil of sweet gaultheria
Composed of more than 95% methyl salicylate, Scented Wintergreen Essential Oil is the oil for athletes. It is an exceptional anti-inflammatory and skin analgesic.
- Latin name: Gaultheria fragrantissima Wall.
- Distilled part: leaves
- The most effective in case of : Curvatures, Lumbago, Back pain, Tendonitis, Osteoarthritis
The essential oil of Petit Grain Bigarade
Derived from the leaves of the Bitter Orange tree, Essential Oil of Petit Grain Bigarade has remarkable effects on the central nervous system, thanks to its antispasmodic and sedative properties. It is therefore essential against stress.
- Latin name: Citrus × aurantium ssp. amara (Link) Engl.
- Distilled part: leaves and small branches.
- The most effective in case of : Anxiety, Stress, Palpitations, Oily skin.
The essential oil of Officinal Lavender
Lavender Essential Oil True or Fine also known as Officinal Lavender is an essential oil that is very well tolerated, especially by children. It is known for its skin, analgesic, calming or even healing virtues.
- Latin name: Lavandula officinalis Chaix or Lavandula angustifolia Mill.
- Distilled part: flowering tops
- The most effective in case of : Insect bite, Itching, Headache (children), Anti-lice, Psoriasis, Burn, Sunburn
The dangers of essential oils
Very powerful products
It cannot be said enough, aromatherapy is indeed a natural medicine, but it should not be considered as an alternative medicine. Essential oils have an effectiveness based on 3 pillars:
- They are composed of many aromatic molecules, each with their own properties, giving essential oils combined modes of action that are sometimes very interesting;
- their bioavailability is very good: when an essential oil is deposited inside the wrists, it takes only a few minutes for the aromatic molecules to be present in the blood;
- Unlike many natural remedies, essential oils are highly concentrated in active ingredients, which is what makes them so powerful.
A very variable toxicity
Essential oils are therefore very powerful, and consequently present certain toxicities. This toxicity is however very variable:
- it depends on each essential oil (some are very flexible in use, others less so) ;
- it depends on each user (children and pregnant women, for example, are sensitive users) ;
- it depends on each mode of use (the oral and dermal routes, for example, are more or less sensitive to each toxicity).
What you need to know before each use
For a specific benefit sought, before using an essential oil, it is therefore important to know for sure:
This information is normally given systematically and for every use in aromatherapy books, serious advice sites or in some well-trained pharmacies. If you don't know how to answer these three questions, we recommend that you ask before using essential oils.
Precautions for sensitive users
Forbidden to children and babies?
When we talk about essential oils, we often hear that they are forbidden to children and babies. Although they are powerful natural products, some essential oils can still be used by children and/or babies, but with adapted methods of use. Here are some rules of use specific to children and babies:
- No essential oils in the first 3 months;
- Up to 6 years of age, avoid the oral route, unless specially prescribed;
- Until 6 years, dilute essential oils used by cutaneous way in a vegetable oil;
- Respect specific dosages for the age of your child: do not copy a synergy for adults;
- Check the contraindications of each essential oil, some are clearly prohibited for children (list here) and for babies (list here).
- As always with essential oils, when in doubt, abstain.
Forbidden to pregnant women?
It is excessive to say that the use of essential oils is prohibited for pregnant women, but this use requires more precision and precautions. Here again are some specific rules for pregnant women:
- No essential oils in the first 3 months of pregnancy;
- Avoid the oral route altogether;
- Dilute the essential oils used by skin in a vegetable oil;
- Respect specific dosages for your condition: do not copy a synergy not specific to pregnant women;
- Check the contraindications of each essential oil, some are clearly prohibited for pregnant women (list here), such as those containing ketones.
- As always with essential oils, when in doubt, abstain.
Other sensitive users
Children and pregnant women are not the only people who need to be extra careful with essential oils. Here are 3 specific use guides for :
How to choose a good quality essential oil?
Essential oils are natural products. Nature is not a factory and does not produce anything standard: there is therefore a great diversity in the quality of essential oils that can be found on the market. Indeed, the quality of an essential oil depends on many factors, of which here is a non-exhaustive list: the precise variety of the aromatic plant, the soil, the method of cultivation, the weather conditions, the harvesting conditions, and of course the distillation process.
All of these factors have a considerable impact on the quality of essential oils, and therefore also on their efficacy and potential toxicity. Their organoleptic quality can be impacted, for use in cosmetics or perfumery, but also and especially their therapeutic quality. It is therefore essential to choose correctly its bottle for any therapeutic use.
Organic essential oils or not ?
Today in France, many brands of aromatherapy make the choice of BIO for part of their range of essential oils. However, few of them present a 100% ORGANIC range, the price difference for some essential oils being very significant between the two. The question that arises is: is it so important?
Yes, using ORGANIC essential oils is very important, for 3 reasons.
- For health reasons. For years it was rumored that pesticides potentially present in plants did not end up in the essential oil, removed by steam distillation. This idea is totally false: countless studies of pesticides show the significant presence of pesticides in conventional essential oils. We mentioned above the excellent bioavailability of essential oils: if you use an essential oil containing pesticides, they will find their way into your bloodstream very quickly. The presence of pesticides in such a product is therefore a total nonsense in the context of aromatherapy.
- For reasons of traceability and quality. Certification bodies require a certain amount of traceability of the batches of essential oils marketed. This traceability is not sufficient, but provides a reassuring basis for quality processes.
- For reasons of ecosystem protection. Organic farming indeed allows to preserve the environment thanks to the absence of synthetic pesticide use, crop rotation or even the presence of grassy strips allowing to preserve the soil and to have positive effects on fauna and flora.
Pure and chemotyped essential oils
For use in aromatherapy, it is also imperative to use pure and chemotyped essential oils. Let us clarify all this.
A pure essential oil is an essential oil that has not been mixed with any other substance. Only aromatic molecules are found in the bottle, and all of these aromatic molecules come from the distillation of the same plant variety. When a brand claims to guarantee that its essential oils are 100% pure, it is therefore claiming that it has not made any mixtures itself, but also that it is able to avoid fraudulent batches. Fraud is indeed commonplace, especially with essential oils from plants grown in distant countries. To ensure that your favorite brand is indeed able to prove this purity, don't hesitate to ask them for at least a chromatographic analysis of your batch: the fact that they are able to do so is already a good signal.
A chemotyped essential oil is a pure essential oil, with species, subspecies, and geographic origin precisely defined. For example, an "Italian Helichrysum Essential Oil" at all is not chemotyped. For an essential oil to call itself chemotyped, there must be the Latin name of the species and subspecies on the label, as well as the place of cultivation. For example:Helichrysum (genus) italicum (species) ssp italicum (subspecies) from France.
Therapeutic grade essential oils
Is your essential oil organic, pure and chemotyped? This is a good basis. However, nature provides a very wide variety of essential oils, with highly variable effectiveness, including when chemotyped. This is where the consumer's choice becomes complicated: How to make sure you are dealing with the right chemotype?
You'll recognize an expert aromatherapy brand by its ability to make available to you the concentrations of each aromatic molecule it wishes to have in each essential oil in order to guarantee its efficacy, as well as by publishing its analyses for each batch it sells you. This transparency and systematic analysis ensures that you're dealing with a serious brand that is an expert in the field.
2 labels are often used in France to boast the intrinsic characteristics of essential oils: HECT and HEBBD. These labels have some weaknesses: they do not publish any precise specifications, belong to commercial players in the sector, and above all are not linked to any external verification or audit.
- EOBBD stands for "Essential Oil Botanically and Biochemically Defined". This label aims to guarantee that the manufacturer knows precisely the plant that has been distilled, however it does not guarantee that this choice is optimal, nor that the essential oil is chemotyped. Unfortunately, in most cases, the bottles labeled do not indicate the place of origin of the batch sold.
- HECT stands for "Hemotyped Essential Oil". Unlike HEBBD, the manufacturer indicates the place of origin and these oils are truly chemotyped. However, there is no guarantee that the choice of this chemotype is optimal with regard to the properties and toxicities expected of the essential oil (particularly those cited in the scientific literature).
To be sure that your essential oil is chemotyped, that it is of therapeutic quality, rely on the information that the label and the manufacturer's website can tell you. No label can be used as a reference on the market today.
The 4 points to check to choose a quality essential oil
To be sure of the therapeutic quality of an essential oil, we recommend checking the following points:
- an organic label (AB, Cosmos or other);
- the precise mention, in Latin, of the species and subspecies of the distilled plant;
- the origin of the essential oil, mentioned on the bottle;
- the mention of the batch number on the bottle, as well as a communication on the website of the chromatographic analysis results of each batch, compared to the expected ones.
Why use essential oils?
The benefits of essential oils are multiple and their fields of action very diverse. This is not surprising, there are tens of thousands of aromatic plants in the world, each of them secreting essential oils for very specific reasons. In addition, each essential oil contains about a hundred different aromatic molecules, with about ten main aromatic molecules, and a multitude of aromatic molecules present in minute concentrations! From this incredible biochemical diversity results a great diversity of properties and potential benefits, which are very difficult to summarize. However, we can roughly summarize the fields of application of essential oils in this way:
- For ENT and respiratory disorders, via antiviral, antibacterial, expectorant properties, etc.
- For nervous disorders, via calming (even sedative) or stimulating properties, via analgesic properties, etc.
- For skin disorders, via anti-inflammatory, healing, spasmolytic, circulatory properties, etc.
- For joint and muscle pain, via analgesic, anti-inflammatory properties, etc.
Essential oils for skin care
Essential oils are very interesting for skin care and in dermatology: they contain a multiplicity of active ingredients, and their use by the skin is very simple, which makes them excellent candidates. Here is a non-exhaustive list of skin problems for which they can be very effective:
- For acne, use antibacterial, analgesic and healing essential oils, such as Tea Tree, Rose Geranium, Noble Laurel, Palmarosa or True Lavender.
- In case of skin allergy, use anti-allergic, antihistamine and anti-inflammatory essential oils, such as Annual Tansy, Chamomile Matricaria or True Lavender.
- In case of sunburn, use skin toning and astringent, anesthetic and healing essential oils, such as Rose Geranium, Lavender Aspic.
- For mycosis, use antifungal, anti-inflammatory and healing essential oils, such as Tea Tree, Noble Laurel, Rose Geranium and Palmarosa.
- For herpes, use antiviral, anti-inflammatory and healing essential oils, such as Niaouli, Tea Tree or True Lavender.
- Against cellulite, use lipid-lowering, lipolytic, draining and diuretic essential oils, such as Lemon, Sea Fennel or Atlas Cedar.
- To get rid of a scar, use mostly Italian Helichrysum, which is highly healing, but also anti-inflammatory and regenerative essential oils like Patchouli and Rosemary Camphor.
- For worms, use anti-infective and dermocaustic essential oils like Cinnamon, Mountain Savory, Tea Tree or Lemon.
Essential oils for muscles and joints
Among essential oils there are products that are highly effective for many joint or muscle problems. These essential oils are used a lot by athletes, but also for people whose age is starting to take its toll. The reasons for this success are multiple. On the one hand, some essential oils have powerful anti-inflammatory, analgesic and muscle relaxing properties. On the other hand, the great effectiveness of essential oils by cutaneous way makes it possible to act directly on the zone concerned, without passing by the digestive system. Here are some examples of common applications:
- For arthritis, use anti-inflammatory and analgesic essential oils to relieve pain (this does not correct the underlying problem), such as Lemon Eucalyptus, Sweet Clover or Nutmeg.
- In case of repeated cramps, use spasmolytic musculotropic, analgesic and decongestant essential oils, such as Lavandin Super, Sweet Clover, or Red Myrtle.
- To soothe courbatures, use parasympathetic system regulating, muscle antispasmodic and rubefacient essential oils, such as Noble Laurel, Sweet Clover and Lavandin Super.
- In case of sprain, use anti-hematoma, anti-inflammatory, analgesic and spasmolytic musculotropic essential oils, such as Italian Helichrysum, Lavandin Super, Lemon Eucalyptus and Peppermint.
- Against a back pain, stuck back or lumbago, use joint analgesic, relaxing and anti-inflammatory essential oils, such as Sweet Clover, Scots Pine, Lavandin Super or even Roman Chamomile.
- In case of torticollis, use anti-inflammatory, anti-rheumatic, neuromuscular relaxing and circulatory tonic essential oils such as Lemon Eucalyptus, Rosemary Camphor, Wintergreen or Vetiver.
Essential oils for the nervous system
By nervous system, we mean the central nervous system (brain and spinal cord), but also peripheral (nerves, receptors). Some essential oils will strongly interact on these systems, sometimes allowing to regulate it, sometimes to stimulate it, sometimes even to short-circuit it. These essential oils aimed at our nervous system are used mostly by the skin, via the bloodstream, but also by the respiratory route, allowing the sensory receptors of the sense of smell to be affected. Here are some examples of common applications:
- In case of anxiety attack, emotional shock, use hypotensive and anti-arrhythmic, calming and antispasmodic essential oils, such as Complete Ylang Ylang, Roman Chamomile or Exotic Verbena.
- To promote concentration, use sympathetic system-regulating, general tonic and stimulating essential oils, such as Noble Laurel, Peppermint and Black Spruce.
- In case of hyperactivity, use calming, antispasmodic and muscle-relaxing essential oils, such as Roman Chamomile, Petit Grain Bigarade, Green Mandarin.
- For intense fatigue, use toning and stimulating, balancing and antispasmodic essential oils, such as Peppermint, Black Spruce, Scots Pine and Basil.
- For neuralgia, use local analgesic and highly spasmolytic essential oils, such as Roman Chamomile, Peppermint and Lemon Eucalyptus.
- Against insomnia, but also to improve the quality of sleep, use antispasmodic, calming and anxiolytic, even sedative oils, such as Greenland Ledon, Marjoram and Petit Grain Bigarade essential oils.
- Against stress, use calming and relaxing, spasmolytic and anxiolytic, hypotensive and antiarrhythmic essential oils, such as Petit Grain Bigarade, Complete Ylang-Ylang, Lemongrass essential oils.
- In support of a depression, and an adapted follow-up, use parasympathicotonic, calming and anxiolytic, endocrine harmonizing essential oils, such as Neroli, Marjoram, Sweet Verbena, Petit Grain Bigarade.
Essential oils for the digestive system
- In case of aerophagia, use gastric and intestinal antispasmodic, choleretic and cholagogic, antibacterial and anti-fermentative essential oils, such as Tropical Basil, Caraway, Coriander (seeds) or Lemon.
- For constipation, use stomachic, digestive smooth muscle spasmolytic, carminative and digestive system tonic essential oils, such as Tarragon, Bergamot, Coriander and Ginger.
- For a detox, use decongestant, draining and liver-detoxifying, anti-oxidant, watery and diuretic essential oils, such as Lemon, Rosemary Verbenone, Peppermint and Juniper.
- In case of diarrhea, turista, use essential oils that are powerfully anti-infectious in the intestinal sphere, spasmolytic and carminative, such as Chinese Cinnamon, Basil, Peppermint and Cardamom.
- Against a gastroenteritis, use major anti-infectious, antispasmodic and anti-inflammatory, immune-stimulating and analgesic essential oils, such as Chinese Cinnamon, Tea Tree, Cardamom, Tarragon or Peppermint.
- Against travel sickness, use antispasmodic digestive organ and carminative essential oils, such as Peppermint, Cardamom, Lemon or Petit Grain Bigarade.
Essential oils for the ENT and respiratory sphere
- Against a angina, use antiviral and antibacterial, analgesic, immune-stimulating and anti-inflammatory essential oils, such as Niaouli, Tea Tree or Ravintsara.
- In case of pollen allergy, use antihistamine, anti-inflammatory, and antispasmodic essential oils, such as Annual Tansy, Fine Lavender, Lemon Eucalyptus.
- In case of flu, use broad-spectrum antiviral, immune-stimulating, endocrine-stimulating, and anti-neural essential oils, such as Ravintsara, Black Spruce, Noble Laurel, or Eucalyptus Radiata.
- To relieve asthma, use relaxing and spasmolytic essential oils of the respiratory sphere, anti-inflammatory, bronchodilator, expectorant and mucolytic, such as Roman Chamomile, Lemon Eucalyptus, Red Myrtle or Khella.
- Against a otitis, use anti-inflammatory essential oils of the ENT sphere, broad-spectrum antibacterial and analgesic, such as Thymol Thyme, Eucalyptus Radiata, Fine Lavender.
- To strengthen immunity, use immunostimulant essential oils of course, but also anti-infectious, detoxifying and hepatoprotective, such as Ravintsara, Tea Tree, Lemon, Thyme to Thymol.
- Against a cold, use anti-infectious and anti-inflammatory, mucolytic and expectorant, decongestant and mildly analgesic essential oils, such as Eucalyptus Radiata, Field Mint, Balsam Fir, Thyme Linalol.
- Against an oily cough, use expectorant and mucolytic, antibacterial, antiviral and immunostimulant essential oils, such as Green Myrtle, Niaouli, Eucalyptus Radiata or Tea Tree.
Other health applications of essential oils
To complete the tour of the multiple health uses of essential oils, we must mention :
- disorders related to female cycles (menopause, painful periods, etc.),
- metabolic and circulatory concerns (cholesterol, hypertension, heavy legs, varicose veins, etc.),
- bucco-dental problems (cavities, canker sores, oral herpes, etc.),
- some concerns related to sexuality,
- as well as many bobos and everyday worries (little accidents, stings, nosebleeds, etc.).
Essential oils in atmospheric diffusion
Essential oils are commonly used in air diffusion, for several types of applications: to sanitize the ambient air(thanks to the anti-microbial and purifying properties of essential oils), against bad odors (by purifying the germs responsible for bad smells), to take advantage of the calming or stimulating properties of essential oils (by improving the quality of sleep, or concentration at work), or simply to reproduce a natural scent that is dear to us (smell of forest, lavender field, etc.).
It is important to note that not all essential oils are allowed for diffusion. You can find a list of approved essential oils here.
To diffuse these essential oils, you can use a spray or an aromatic diffuser. We do not recommend using a spray, as the essential oils are mixed with alcohol sprayed in micro-droplets, which quickly fall back to the ground: their effectiveness is therefore very short-lived. If you want to use a essential oil diffuser, know that there are several technologies of varying effectiveness: the best of them is undoubtedly the diffusion by nebulization.
Essential oils to take care of your hair
How can essential oils take care of our hair? It is indeed an application that one would not really have an idea of in view of the numerous properties previously mentioned, more therapeutic than cosmetic. Indeed, essential oils are not cosmetic products in their own right. However, their amazing virtues make them excellent "additives", or "concentrated active ingredients" in order to complete the effectiveness of a cosmetic product, a neutral base or a homemade mixture. Concerning the hair care, essential oils will be able to act on several axes:
- Some will improve the vascularization of the scalp, thanks to their vasodilator properties;
- Some of them will cleanse the scalp, thanks to their antiseptic properties;
- Finally, some will act on the secretion of sebum from the scalp, thanks to their lipolytic properties in particular.
Thus, essential oils can accelerate hair growth, slow down hair loss, take care of hair that is too oily or too dry, etc.
Essential oils in the bath
essential oils in the bath
- You can add them to your shower gel. It's easy, but on the one hand you may be using solid soaps, and on the other hand, exceeding a certain dose may cause the shower gel to go out of phase.
- You can also, and preferably, use them as bath salts, by mixing them with Dead Sea salt or Epsom salt. You benefit from the properties of salt, but also from a medium of choice, which keeps well and allows a perfect dilution.
Essential oils as massage oil
Making a massage oil with essential oils is both very easy, very effective and very common. Using only a few products, you can obtain a personalized oil, and relatively stable over time.
This requires vegetable oils as a base (Borage, Apricot Kernel, Macadamia, Sweet Almond, Jojoba, etc.), the choice of which will depend more on the expected texture than the intrinsic properties of the oil. Once the base is established (potentially a mixture of several vegetable oils), it is possible to add an average of 5% of essential oils, depending on the expected properties of the massage.
You will be able to make relaxing or invigorating massage oils, post-sport recovery oils, slimming massage oils, etc.
Essential oils to make your own perfume
In the collective imagination, before hearing about aromatherapy, an essential oil is above all a smell, a scent, a perfume. Beyond their use in aromatherapy, it should be noted that for centuries, essential oils have been the basic ingredient of all perfumers, and that even today some perfumes use natural and non-synthetic fragrances, derived from essential oils. Similarly, some essential oils that are not very expensive in conventional agriculture, such as Lavender, Lemon or Mint, are still used as fragrances in everyday products such as washing powder or certain soaps.
The question we're interested in here: can you make your perfume with essential oils? Yes, you can use essential oils to bring together the different notes of your perfume, and then mix them in alcohol or a vegetable oil. For example, you can use the following essential oils:
- Top notes: Tea Tree, Basil, Lemon, etc.
- Heart notes: Roman Chamomile, Palmarosa, Cinnamon, etc.
- Base notes: Atlas Cedar, Cistus, Patchouli, etc.
However, we must qualify our statement. Many essential oils have an odor that may be distasteful. Homemade perfume making with essential oils, while possible and a lot of fun, is not a very common practice. It often requires a lot of trial and error before finding the perfect blend, and also and most importantly time.
Essential oils and animals
Essential oils do not, of course, interact exclusively with human organisms. Asking the question of essential oils for animals is therefore legitimate and can be done on two axes:
- Can we treat animals with essential oils? Yes, essential oils are often used in veterinary therapy, to treat farm animals, horses, but also cats and dogs. It is important to note that animals do not react like we do to essential oils, and special precautions must be employed. Be especially careful with pets, especially cats. If in doubt, consult your veterinarian.
- Can pest treatment be done with essential oils? Yes, essential oils are very effective in repelling unwanted pests or insects, sometimes simply because of their strong odor (rodents are very sensitive to them), or because of the insect repellent properties of certain aromatic molecules, keeping mosquitoes, wasps and flies away.
Essential oils at home
Finally, and we will end this guide with this aspect of essential oils, these magnificent natural extracts can be used in our homes in two very different ways:
Healing with oils...
Theophane de la Charie
- In our recipes from kitchen. While essential oils have a smell, they also have a taste. Their taste is even very strong and the first time, we often tend to overdose them. Very often, only 1 drop is enough to flavor a whole dish. Essential oils derived from spices and citrus fruits are of course often used, but you can also innovate with floral essential oils: originality guaranteed!
- In the making of our household products. To disinfect and clean, you now know the relevance of these powerful aromatic compounds: so they often hold a place of choice in laundry, detergents and "home" cleaners, either to enhance their effectiveness or to provide a pleasant smell.
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