Essential oils vs fragrance oils in soap: which is kinder to sensitive skin?
Every few weeks someone asks us the same thing: "I've got sensitive skin, so should I buy the one with essential oils or the one with fragrance oil?" It's a fair question, and the honest answer is a bit less tidy than most soap labels would have you believe.
What the words actually mean
An essential oil is a concentrated extract taken straight from a plant. Lavender flowers, tea tree leaves, that sort of thing. A fragrance oil is made in a lab, or built from a blend of natural and synthetic ingredients, to smell like something. That something might be a flower, or it might be bubble gum, which no plant has ever managed.
It's tempting to file one under "natural and gentle" and the other under "chemical and harsh". Skin doesn't sort things that way. Plenty of lab-made scents are well tolerated, and plenty of plant extracts can cause a reaction on skin that's already dry or easily upset. Natural doesn't automatically mean kind.
Neither one is automatically gentler
Fragrance is one of the more common triggers of skin reactions, and that includes both synthetic fragrance and the compounds found naturally in essential oils. Lavender and tea tree are lovely, and they are also well known as ingredients some people react to. If your skin is thin, dry or mature, it can be more easily bothered by anything with a scent, whichever bottle it came from.
Two things do make a difference. The first is how much scent is in the bar, since a light touch is easier on skin than a heavy one. The second is how your own skin behaves, which no label can tell you. If you've reacted to perfume or scented laundry powder before, that's useful information, and it's worth keeping in mind when you pick a bar.
A quick comparison
| Type | What it is | Worth knowing |
|---|---|---|
| Unscented | No added essential oil or fragrance | The safest pick for very reactive skin, because there's one less thing to react to |
| Essential oil | Scented with plant extracts | Smells natural and varies with the plant, but can still irritate some skin |
| Fragrance oil | Scented with a blended or lab-made oil | Opens up scents plants can't make, and is not automatically harsher |
How to choose without guessing
If your skin is very reactive, start with unscented. It takes the scent question off the table, and if your skin settles down, you've learned something. If you're only mildly sensitive and you love a particular smell, a scented bar is a reasonable thing to try. Just introduce it slowly.
A patch test is worth the two minutes. Lather the bar, rub a small spot on your inner forearm, rinse, and see how it looks over a day or so. Rinse the bar off properly every time, and if you notice redness, itching or tightness that doesn't ease, stop using it. For ongoing skin trouble, a chat with your GP or a dermatologist is the right next step, not another soap.
It also helps to change one thing at a time. If you swap your soap, your moisturiser and your laundry powder in the same week and your skin objects, you'll never know which one to blame. Keep everything else the same, try the new bar for a couple of weeks, and take notes if you like.
Where our bars sit
All four bars below are made the same way, with grass-fed tallow, in small batches here at the homestead. Only the scent differs.
The Just Tallow Soap 6% is our unscented bar, and the one we'd point you to first if your skin is easily upset. The Lavender and the Australian Tea Tree bars are scented with essential oils. The Bubble Gum bar is scented with a fragrance oil, and it's the one the grandkids tend to fight over.
If you're not sure where to start, grab the unscented bar and try one of the scented ones alongside it. Your skin will tell you which suits it better than we can.