Unbottling Fragrance Pt. 2: How Scent Affects Our Bodies
Ever sample a fragrance that your friend claimed was elegant and lovely, only to find it’s the stinkiest stank you’ve ever stunk? Maybe it just doesn’t make you feel very good, but you can’t pinpoint why.
Fragrance affects everyone differently. It’s often pleasant, but other times can trigger skin reactions, respiratory system, nervous system, or sometimes the immune system.
One person may tolerate a product perfectly, while another may develop a rash, migraine, or coughing fit. These reactions are often lumped together, but they are not all the same.
In this article, we’ll look at different ways fragrance might affect the body. In Part 3, I’m opening up deeper questions around fragrance chemicals, hormones, indoor air, and the cumulative concerns of long-term exposure.
Fragrance is Not Limited to Perfume
We encounter scents in cosmetics, detergents, cleaning products, air fresheners, candles, public spaces, the back of Ubers, and so much more. This is why individual fragrance risk should be considered by product type and usage.
A scented rinse-off cleanser is not the same as a scented leave-on face cream. One is washed away quickly, while the other stays on the skin. Perfumes and body sprays are designed to stick to fabric and skin. Room sprays, diffusers, candles, wax melts, and aerosols linger in the air, which affects everyone in the space.
The Difference Between Sensitivity and Allergy
Understanding the difference between reaction types can help you assess your personal risk tolerance. From there, you can choose products more thoughtfully.
A fragrance-related allergic reaction is most commonly allergic contact dermatitis. It happens when the immune system is sensitized to an ingredient and reacts to skin contact, often hours or days after exposure.
Anaphylaxis is also an allergic reaction, but it is not the same as the skin allergy most common to fragrance. Anaphylaxis is a severe, rapid allergic reaction. It requires emergency medical care.
Allergies are different from irritation. Irritation is stinging, burning, or redness.It is also different from fragrance sensitivity and aversion. A scent sensitivity can trigger headaches, nausea, dizziness, coughing, or migraines without causing an allergic reaction.
|
Response Type |
What is happening |
Common Triggers & Symptoms |
|
Anaphylaxis |
A rapid, systemic allergic reaction. This is a medical emergency and is not the same as fragrance sensitivity or contact dermatitis. |
Rare, but possible with specific ingredients or exposures. |
|
Allergic Contact Dermatitis |
The immune system is sensitised to an ingredient when it touches the skin. |
Rash or eczema from fragrance allergens, including in lotion, deodorant, perfume, soap, or essential oils. |
|
Irritant reaction |
A substance irritates the skin, eyes, nose, or throat. This does not require an allergy to occur. |
Stinging skin, burning or watery eyes, sore throat, coughing, or burning sensation. |
|
Migraine or nervous-system trigger |
An odour triggers symptoms in someone who is susceptible to migraines or neurologically sensitive. |
Headache, nausea, dizziness, sensory overwhelm, or migraine symptoms. |
|
Respiratory sensitivity |
The airways become irritated or existing breathing conditions such as asthma are worsened. |
Coughing, wheezing, chest tightness, or asthmatic symptoms. |
|
Scent aversion |
A person dislikes or feels overwhelmed by a smell, without any one clear allergy, skin, migraine, or respiratory reaction. |
Finding “clean laundry,” powdery musk, sharp florals, vanilla, smoke, or solvent-like perfumes unpleasant or overwhelming. |
That Icky Chemical-y Smell
Many people dislike what can only be described as “chemical-smelling” perfumes. It’s a vivid phrase. Everything is made of chemicals, whether it comes from a garden rose, an essential oil, a synthetic musk, or cheap perfume. Smell happens when volatile molecules travel through the air and reach our noses. It’s all chemistry.
When something smells “chemical,” people usually mean it smells sharp, metallic, powdery, plasticky, solvent-like, artificial, or too strong. That effect can come from many sources, including alcohols, solvents, aldehydes, fixatives, musks, or terpenes such as limonene and pinene, which occur naturally in many essential oils.
So, “chemical-smelling” does not always mean synthetic, and natural does not always mean gentle. The better questions are how strong the scent is, how long it lasts, whether it is airborne or applied to the skin, and whether the person exposed is prone to reactions.
Why the Nose Prefers Natural
Essential oils and botanical aromatics usually smell more familiar: citrus peel, herbs, flowers, woods, resins, spices. Products with natural fragrance can seem less aggressive on our senses because they may lack additives that preserve the longevity of the product.
Essential oils and botanical extracts often contain dozens, sometimes hundreds, of aromatic chemicals at once. This can make them smell more layered and complex than a single isolated aroma chemical. A lab-made/synthetic aroma may smell more linear or one-note. To noses accustomed to the complexity of whole botanicals, that simplicity might seem flat, sharp, or artificial. Natural Fragrance can still be Allergenic
At Optimum Health, we do our best not to carry products containing undisclosed “parfum”. We prioritise clearly identified botanicals and natural sources, including essential oils, hydrosols, resins, and other aromatic plant materials.
We love botanicals, but also respect them. Natural fragrances can still cause reactions. They are biologically active materials, and anything concentrated enough to affect our bodies should be used thoughtfully.
Essential oils and botanicals are a beautiful choice when they are high quality, properly diluted, stored away from heat and light, and used with care.
How to Choose Fragrance Thoughtfully
Your tolerance level should guide your choices. Easily irritated skin does best with fragrance-free skincare, especially leave-on products. A scented body wash can be rinsed away, while a scented lotion stays on the skin. It all depends on your unique needs.
For laundry, consider fragrance-free detergent and skip fabric softeners or scent boosters, which are designed to linger. For home fragrance, use less, ventilate more, and avoid diffusion in small spaces. “Natural” air scenting is not automatically safe for everyone in the room.
For known allergies, medical assessment and patch testing may help identify the specific allergens to avoid.
Enjoying Fragrance Respectfully
For some, fragrance is a rash. Others, a migraine, a cough, a burning throat. For many, it is comfort, identity, and ritual.
Mindful fragrance use requires clear labels, access to fragrance-free alternatives, and respect for shared air. It requires compassion, knowing that one person’s signature scent may be another person’s very bad day.
As with every health subject we explore at Optimum Health, we encourage asking questions, researching critically, listening to your body, and choosing what best fits your lifestyle needs.
Coming in Part 3
I’m looking at the larger safety questions around fragrance-associated compounds, including phthalates, synthetic musks, endocrine disruption, indoor air, cumulative exposure, and environmental persistence. … Oh boy!!
References for Part 2
Government of Canada. Cosmetic advertising, labelling and ingredients. Health Canada.
DermNet. Fragrance allergy.
DermNet. Allergic contact dermatitis to essential oils.
Scientific Committee on Consumer Safety. Opinion on fragrance allergens in cosmetic products. European Commission.
American Migraine Foundation. Top 10 Migraine Triggers and How to Deal with Them.
Imai, N. Classification of odors associated with migraine attacks. Scientific Reports. 2023.