Every so often, someone asks the same question: “Which brand should I buy?” The honest answer is that the brand matters less than what you do with the bottle once it is in your hands. Still, NOW Essential Oils have earned a solid place in the market. They are widely available, fairly priced, and packaged in dark glass. Those qualities make aromatherapy accessible to people who might never otherwise try it.
That accessibility is a good thing, but it carries a responsibility. Affordable and easy to find is only a virtue if the oils are used wisely. Essential oils are not gentle perfumes in a bottle. They are highly concentrated plant extracts, each containing dozens or even hundreds of individual chemical constituents. One drop of peppermint oil can represent the aromatic compounds of a great many leaves. That concentration explains both their appeal and their potential to cause harm when misused.
The good news is that safe use is not complicated. Most problems come from a handful of avoidable errors: applying oils undiluted, keeping them in warm places, buying too many at once, and following every internet claim without question. A little chemistry, a little common sense, and a respect for dose go a long way.
The twenty tips below are organised into four practical stages: choosing your oils, storing and handling them, applying them safely to the skin, and using them in everyday life. Some tips are technical, others simple, but each is based on the same principle. Essential oils are at their best when they are fresh, well-chosen, properly diluted, and used in moderation.
Whether you are opening your first bottle or your fiftieth, these tips will help you get more pleasure, and more safety, from every drop.
1. Read the Latin name, not just the common name
Common names are slippery. “Lavender” might be Lavandula angustifolia, prized for its sweet, gentle profile, or lavandin (Lavandula × intermedia), which is higher in camphor and considerably more penetrating. “Eucalyptus” could be globulus, radiata, or citriodora, each with a different chemistry and safety profile. Before you buy, look for the botanical name on the NOW label and choose accordingly. This one habit tells you far more about what is inside the bottle than any marketing phrase, and it lets you look up reliable safety data for the exact oil you are holding.
2. Start with a short, versatile list
It is tempting to buy thirty bottles at once. Resist. Begin with five or six oils that work in many ways: lavender, sweet orange, peppermint, tea tree, frankincense, and perhaps a eucalyptus. Learning a few oils well is worth more than owning many oils badly. Smell each one on a tissue over several days and notice how it changes as it evaporates, from bright top notes to deeper base notes. You will start to recognise quality, and you will discover which aromas you truly enjoy. That matters more than any published list of “properties.”
3. Understand what “100% pure” does and doesn’t tell you
A label reading 100% pure essential oil tells you the bottle has not been diluted with carrier oil or synthetic fragrance. It does not tell you the oil is safe for every purpose, nor that it is free from oxidation. Purity and safety are separate questions. Pure cinnamon bark oil can still burn the skin, and a pure oil with a poor storage history can still sensitise. Treat the claim as a starting point. Then look for batch information, ask for chemical analysis when you need it, and follow sound safety guidelines for the specific oil you are using.
4. Ask about GC/MS testing when it matters
Gas chromatography–mass spectrometry (GC/MS) separates an oil into its individual constituents and produces a chemical fingerprint. It is one of the most useful quality tools available. If you are buying in larger quantities, making products for others, or using oils around children or older adults, ask NOW’s customer service what testing information is available for your batch. A reputable company welcomes the question. Chemistry can reveal adulteration, unusual proportions of key constituents, and signs of ageing. Even if you never read a chromatogram yourself, knowing that one exists gives you real confidence.
5. Match the bottle size to how quickly you will use it
Essential oils are living chemistry, and once opened they begin, slowly, to change. Every time oxygen enters the bottle, oxidation edges forward. Buy smaller sizes of oils you use sparingly, especially citrus oils and tea tree, which oxidise more readily. Save larger bottles for oils you use often, or those that keep well, such as patchouli, vetiver, and sandalwood. Write the purchase date on the label with a marker. A bottle you finish within a year or two will always serve you better than one that lingers for five.
6. Store in a cool, dark place
Heat, light, and air are the three enemies of an essential oil. NOW’s amber glass protects against light, but it cannot defend against a sunny windowsill or a warm bathroom shelf. Keep your bottles in a drawer, a cupboard, or a wooden box, ideally at a temperature of about 5–20 °C (41–68 °F). Bathrooms are a common mistake, because steam and temperature swings speed up oxidation. If you love having oils on display, keep a decorative empty bottle out and the real ones tucked safely away.
7. Keep caps tight and bottles upright
An oil’s most volatile molecules, the ones responsible for its brightest aroma, are the first to escape. Close the cap immediately after use, and store bottles upright so oil does not sit against the reducer, where it can creep, dry, and harden into a sticky residue. When a bottle falls below half full, consider transferring the oil to a smaller dark glass bottle to reduce the air space above it. It is a simple, inexpensive trick that noticeably extends freshness, especially for citrus and pine oils.
8. Refrigerate your citrus oils
Citrus oils such as orange, lemon, lime, grapefruit, and mandarin are rich in limonene, which oxidises comparatively quickly. Oxidised limonene is a well-known cause of skin sensitisation, so this is more than a matter of aroma. Storing citrus oils in the refrigerator, in a sealed container away from food, slows the process considerably. Let the bottle come to room temperature before opening to avoid condensation. Even so, plan to use citrus oils within about a year or two of opening, and discard any that smell flat, sharp, or turpentine-like.
9. Use glass, not plastic, for anything undiluted
Undiluted essential oils can soften, cloud, or even dissolve some plastics, and the plastic can leach into the oil. Keep your oils in the glass bottles they came in. For blends and dilutions, choose dark glass, or plastics known to resist essential oils (such as PET or HDPE) for short-term storage only. Never leave neat oils in polystyrene or thin disposable cups, even briefly. When measuring, use glass or stainless steel, and wash your tools in warm, soapy water afterwards so scents do not carry over between blends.
10. Learn to recognise an oil that has gone off
Trust your nose. A fresh oil smells clean and characteristic. An oxidised oil often smells sharper, more resinous, or reminiscent of turpentine, and may look darker or feel thicker and stickier between your fingers. Tea tree oil, for instance, can shift from fresh and medicinal to harsh and acrid. Oxidised oils are more likely to provoke skin reactions, so do not use them on the body. They can be repurposed for household cleaning or simply discarded. When in doubt, replace the bottle. The cost is small compared with a rash.
11. Always dilute for skin application
Undiluted application, or “neat” use, is far from the harmless practice many websites suggest. It can cause irritation and, more seriously, sensitisation, an allergic response that may last a lifetime. For adults, a dilution of 1–2% is sensible for regular body use: roughly 6 to 12 drops of essential oil per 30 mL (1 fl oz) of carrier oil such as sweet almond, jojoba, or fractionated coconut oil. Use lower concentrations for the face and for children, older adults, and anyone with sensitive skin. More is not better. It is merely riskier.
12. Patch test new oils and new blends
Before applying a new blend widely, place a small amount of the diluted oil on the inner forearm, cover it with a bandage, and leave it for 24 hours. Redness, itching, or swelling means you should stop, wipe the area with plain vegetable oil, and then wash with mild soap and water. Patch testing is especially wise if you have eczema, allergies, or a history of reacting to fragrance. It takes a minute to do, and it may spare you a reaction that takes weeks to settle.
13. Respect the phototoxic oils
Cold-pressed citrus oils, notably bergamot, lime, and grapefruit, contain furanocoumarins that react with ultraviolet light. The result can be burning, blistering, and pigmentation that lingers for months. Check whether your bottle is cold-pressed, steam-distilled, or furanocoumarin-free, and keep dilutions low for leave-on products. Bergamot, for example, is generally limited to around 0.4%, and cold-pressed lemon to about 2%. Avoid sunlight and tanning beds for at least 12 hours after applying these oils to the skin. Or choose a non-phototoxic oil and avoid the problem altogether.
14. Be especially careful with “hot” oils
Some oils, particularly cinnamon bark, clove, oregano, thyme, and lemongrass, are rich in phenols or aldehydes that irritate skin and mucous membranes at surprisingly low concentrations. Safe dermal limits for cinnamon bark and clove can sit well below 1%. If you use them at all, use them sparingly and in well-diluted blends, often a single drop in a generous amount of carrier. Never add them undiluted to a bath, where oil floats and can contact the skin at full strength. Many people are happiest leaving these oils on the shelf.
15. Reach for carrier oil, not water, after a spill or eye contact
Essential oils do not dissolve in water, so a splash of water on the skin or in the eye simply spreads the oil around. If oil gets in your eye, dab gently with a fatty carrier oil or full-fat milk on a cotton pad, and seek medical attention if pain or blurred vision persists. For skin contact, apply carrier oil first, then wash with mild soap. Keep a small bottle of plain vegetable oil near your workspace. It is a tiny precaution that can turn a frightening moment into a minor annoyance.
16. Diffuse intermittently, not all day
More vapour does not mean more benefit. Diffusing for 30 to 60 minutes, then giving the room a break, is generally enough to enjoy an aroma and is kinder to anyone who may be sensitive to it. Use 3 to 5 drops in an ultrasonic diffuser at a time, in a well-ventilated space of reasonable size. Continuous diffusion in a small, closed room can lead to headaches, nausea, or irritated airways, particularly in people with asthma. Remember that the nose adapts quickly. When you can no longer smell an oil, that is your sense of smell tiring, not a sign that you need more.
17. Take particular care with children, pregnancy, and pets
Peppermint and eucalyptus oils, rich in menthol and 1,8-cineole, should not be applied on or near the face of infants and young children, because of the risk of breathing difficulties. During pregnancy, choose oils with a long record of safe use, dilute generously, and consult a knowledgeable practitioner. Pets are different again. Cats in particular metabolise many aromatic compounds slowly. Diffuse only in a room the animal can freely leave, never apply oils to their fur, and be especially cautious with tea tree and phenol-rich oils around them.
18. Do not ingest essential oils without qualified guidance
Read your bottle’s label carefully. Essential oil labels typically advise external use only, and that advice deserves respect. Ingesting oils in water, honey, or capsules, as is often promoted online, may harm the digestive lining or the liver and can interact with medications, while the evidence of benefit remains thin. Oils sink or float in water rather than mixing, so they reach the mucous membranes in concentrated form. If you want flavour, use the fresh herb or spice. If you want a therapeutic effect by mouth, work with a clinician trained in this area.
19. Blend with intention, and keep it simple
A good blend needs only two to four oils. Combine a top note such as sweet orange, a heart note such as lavender, and a base note such as frankincense or cedarwood, then let the blend rest for a day so the aromas can marry. Keep a notebook of recipes with exact drop counts, and change only one variable at a time. Most disappointing blends suffer from too many oils in too high a concentration. Complexity does not guarantee beauty. The simplest combinations are often the ones you return to again and again.
20. Keep your expectations honest
Essential oils can lift the mood, freshen a room, and ease a moment of tension. Some uses have credible research behind them, such as lavender for anxiety and sleep and tea tree oil for minor skin problems. But they are not a substitute for medical care, and no oil is a cure. Enjoy them for what they are: beautiful, complex, and powerful plant materials that reward knowledge and restraint. If you have persistent symptoms, consult a health professional, and treat aromatherapy as a pleasant companion to good care rather than a replacement for it.
Conclusion
NOW Essential Oils offer an appealing entry point to the world of aromatherapy. They are accessible, well presented, and available in a wide range of oils. But the bottle is only the beginning. What turns a purchase into a good aromatherapy experience is knowledge: knowing what is in the bottle, how to keep it fresh, how to dilute it, and when to hold back.
If you remember only a few things from these twenty tips, let them be these. Check the botanical name. Store your oils cool, dark, and sealed. Always dilute for the skin. Diffuse in moderation. Be cautious with children, pregnancy, and pets. Each of these habits reduces risk and, at the same time, improves your enjoyment, because a fresh, well-used oil simply smells better and feels better.
Aromatherapy is, at its heart, a conversation between people and plants. It has been carried on for thousands of years, and it does not need exaggeration to be worthwhile. Approach your oils with curiosity, respect their strength, and let the experience unfold slowly. Over time, you will develop the most valuable tool of all: an educated nose and a steady hand.