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An essential oil is a documented scent tool for a named chassis — not a wellness dropper

A cream brief that says ‘add something natural’ has not chosen a raw material. An essential oil is a named distillate or expression with a composition that will walk by harvest, a restricted-substance file that belongs to a product type, and an oxidation clock that is chemistry, not a moral story about ‘real plants.’ This hub is the selection map: product type first, then the file, then whether a botanical mixture is even the right object versus a fragrance concentrate. It does not retell the leave-on dilution diagnostic, the citrus daylight article, or the essential-oil-versus-fragrance-oil fork already published on MO-LAB. It does not treat any oil as therapy.

Already live: leave-on dilution (not kitchen drop-counting); citrus phototoxicity in day creams; essential oil versus fragrance oil as a documentation choice; IFRA leave-on versus rinse-off category assignment; oxidation after a vial is opened; the O/W addition-step page; and the Scale 2 solubilizer guide for traces in clear water. This page is the category bridge — plus the dilution calculator when you already have a legal target from the file, not from a blog.

Name the finished product before you name the plant

IFRA categories, allergen declaration, phototoxicity, and solubilizer budget all change when the chassis changes. A rinse-off soap, a leave-on face cream, an anhydrous oil, and a clear toner are four different purchases that happen to share a bottle on the shelf. If the brief cannot say which one it is, stop shopping.

Selection filters for cosmetic essential oils. Use levels, IFRA tables and allergen thresholds stay on the current file for that oil and that product type.
Chassis you are actually building	What the lot must already have	Where MO-LAB already answers
Leave-on face cream or serum that will be scented with a botanical distillate	Current IFRA category for that oil in that product type, allergen breakdown, oxidation date	Dilution article if the brief is still ‘a few drops.’ Fragrance-versus-EO article if reproducibility is the real job.
Day cream, SPF companion, or anything worn in daylight with a citrus expression	Expressed vs distilled grade, phototoxicity language on that lot, whether night-only is honest	Citrus phototoxicity article. Do not invent a bergamot URL that 404s.
Clear water gel or toner that only wants a trace scent	A solubilizer budget, not a carrier-oil fantasy; a file that matches a micro-dose	Scale 2 solubilizer guide. Dilution calculator after the file gives a number — never before.
Anhydrous oil serum where the lipid is the host, not a solubilizer apology	A real oil phase (jojoba is a verified teaching host), oxidation of both host and EO	Carrier-oil hub for the host. Rancidity article if the lipid already failed. Dilution article for the leave-on dose logic.
A shower line and a face cream that somehow share one vial on the PO	Whether purchasing assigned a rinse-off category and marketing later moved the same oil onto skin that stays	IFRA category-assignment article. Do not paste a cleanser number onto a leave-on.
A vial already open on the bench that smells harsher than the retain	Headspace, light, age since first opening — before anyone writes a new dose	Opened-vial oxidation article. Daylight citrus still belongs on phototoxicity.
An O/W cream where the scent was dumped into the wrong process window	Whether the chassis was still hot, already cooled, or being force-emulsified around the oil	Cream addition-step article. Drop-counting still belongs on the dilution page.

Product type is the first specification line

The same lavender lot is not one ingredient across a soap, a night cream, and a baby-adjacent claim you should not be writing here anyway. Restricted-substance math is category-specific. Allergen declaration is market-specific. Phototoxicity is route-and-grade-specific. Write the finished product on the purchase order: leave-on face, rinse-off, anhydrous, or water-clear. If marketing wanted ‘the smell of the plant’ in a transparent gel, they asked for a solubilized trace or they asked for a cloudy emulsion. Those are different briefs. This hub will not invent a percentage to paper over that fork.

No file, no scent — a bottle is not documentation

A GC or supplier composition, an IFRA / restricted-substance statement for the current year, and an allergen breakdown are the object. Odour on a blotter is a QC check, not a substitute. If purchasing swapped lots because the new drum ‘smelled greener,’ they changed the formula. The fragrance-versus-essential-oil article is the place to decide whether a living botanical mixture is even the right class. This hub only insists that you do not buy a class without a file. Lot numbers stay on that lot. MO-LAB will not publish a drop count.

Oxidation is a selection filter, not a later surprise

Citrus expressions and many terpene-rich distillates become harsher and more sensitising as they oxidise. That is a reason to refuse a clear window display, a warm warehouse, or an open dropper left for weeks — before the first batch, not after a complaint. It is also a reason to ask whether the brief still wants that chemistry in a day product. The phototoxicity article stays on daylight and expressed citrus. Here the filter is earlier: can this brand operationally host an oxidisable mixture? If the answer is no, unscented or a fragrance file with a stated retest date is often the honest tool.

Cosmetic scent, not a clinic in a bottle

This page will not discuss mood, infection, ‘healing,’ or acne folklore. Tea-tree therapy copy stays blocked even if a SKU appears later. Verified teaching lots below are lavender (a named botanical mixture), lemon and sweet orange (citrus grades that force a daylight decision), and jojoba as a host oil when the chassis is actually anhydrous. They are not a complete essential-oil catalogue. They carry no prices and no invented IFRA percentages.

Latest diagnostics in this map

Newest live articles for this category, dated by publication. Full diagnostic list stays below.

When the question is already a failure, leave the map

If someone is still counting drops into a cream, open the dilution article. If a citrus day cream is the brief, open phototoxicity. If the argument is ‘natural versus perfume,’ open the documentation fork. If a rinse-off number was pasted onto a face cream, open the IFRA category page. If the water is supposed to stay clear, open the solubilizer guide.

Calculate only after the file gave a target

Verified lots when the brief names a specific oil

Exact Mylo-Opt SKUs only. No tea-tree, no bergamot, no invented 1 kg packs. Jojoba appears here as a host lipid for anhydrous scented oils — not as an essential oil.

Browse the family when the plant is not yet chosen

MO-LAB is educational. Essential oils on this page are cosmetic raw materials with files. They are not aromatherapy, not medicine, and not a substitute for IFRA or a clinician.