Claim: "Chemical-free"
Someone always brings this one to the table with real conviction, and we get it: "chemical" has come to mean "harsh, synthetic, scary". But everything in a jar is a chemical, including water, shea butter and the vitamin E that keeps an oil from going rancid. The UK's Advertising Standards Authority has repeatedly treated "chemical-free" as misleading for that reason.
The worry underneath the slogan is valid, though. People want fewer irritants and fewer ingredients they can't pronounce. The better tool for that is the INCI ingredient list, which in the EU and UK must list ingredients in descending order of concentration (down to 1%).
Plain take: no product is chemical-free. Read the ingredient list instead of the slogan.
Claim: "Natural means safer"
Neither the US Food and Drug Administration nor the EU Cosmetics Regulation (EC) No 1223/2009 defines "natural" for cosmetics. ISO 16128 offers a method for calculating a "natural origin index", and certifiers such as COSMOS (run by bodies including Ecocert and the Soil Association) set their own standards. Those schemes tell you about sourcing and processing, not about whether your skin will tolerate the product.
Plenty of natural substances are potent allergens: balsam of Peru, propolis and oak moss among them. Plenty of lab-made ingredients, such as ceramides identical to those in skin, are notably gentle.
Plain take: origin and safety are separate questions. Judge each ingredient on its own record.
Claim: "Essential oils are gentle aromatherapy for skin"
The fans' case: essential oils smell wonderful, many have antimicrobial activity in a dish, and some people use them for years without trouble. The evidence case: essential oils are concentrated mixtures of fragrance molecules, and many of those molecules, such as linalool, limonene, geraniol and eugenol, are on the EU's list of fragrance allergens that must be named on labels. Commission Regulation (EU) 2023/1545 expanded that list to more than 80 substances. Linalool and limonene also oxidise in air into stronger sensitisers, so an old bottle of lavender oil can be worse than a fresh one.
Citrus oils add a second problem. Cold-pressed bergamot contains bergapten, a furocoumarin that can cause phototoxic burns and dark patches when skin meets sunlight. IFRA, the fragrance industry's standards body, restricts it in leave-on products for that reason.
"Smelling lovely and being kind to skin are two different jobs."Roundtable notes, essential oils thread
Plain take: enjoy essential oils in a diffuser if you like; on skin, keep them heavily diluted or skip them, especially if you are sensitive.
Claim: "Tea tree oil works on spots"
This one surprises the sceptics. A 1990 trial by Bassett and colleagues in the Medical Journal of Australia compared 5% tea tree oil gel with 5% benzoyl peroxide in 124 people. Both reduced inflamed lesions; tea tree acted more slowly but caused fewer side effects. Later small studies point the same way. The catch: neat tea tree oil is a known sensitiser, and oxidised oil more so.
Plain take: a properly formulated 5% product is a reasonable option for mild acne. Never apply the neat oil.
Botanicals that earned their place
Colloidal oatmeal is recognised by the FDA as an over-the-counter skin protectant and is recommended by the National Eczema Association. Aloe vera gel is soothing and widely tolerated, though its reputation outruns the trial data for burns. Centella asiatica has encouraging, if early, evidence for supporting barrier repair. Green tea polyphenols show promise as antioxidants.
Want to argue a botanical onto this list? Write in, or read our gentle swaps for touchy skin.