How to spot pure argan oil: 6 signs

Almost every bottle on the shelf says "argan oil". What varies — enormously — is how much argan is actually inside.

It takes around 30 kg of fruit to produce a single litre of oil, and the fruit is harvested once a year. That is why pure argan cannot be cheap, and why diluted or refined versions are so common.

Here are six signs you can check yourself, starting with the ones that don't require opening the bottle.

1. The label: one single ingredient

This is the most reliable sign of all. The ingredients list (INCI) of a 100% pure cosmetic argan oil should contain just one line:

Argania spinosa kernel oil

Nothing else. If you see parfum, fragrance, added tocopherol, or oils such as helianthus annuus (sunflower) or prunus amygdalus dulcis (sweet almond), you are looking at a blend. Not necessarily a bad product — but you are not paying for pure argan.

One detail worth knowing: ingredients are listed from the largest quantity to the smallest. If argan appears third or fourth, it is a minor ingredient.

2. The colour: light gold, not brown

Cosmetic argan oil is a light, slightly yellow gold, and translucent.

If the oil is dark brown, it is most likely culinary argan: the kernels are roasted before pressing, which darkens the oil and gives it a strong aroma. Excellent for cooking, but not intended for skin.

If, on the other hand, it is completely colourless and clear as water, that usually points to heavy refining, which strips out much of what makes the oil interesting.

3. The smell: mild, nutty and short-lived

Pure, unrefined argan has a characteristic mild scent, faintly nutty. Crucially, it fades within minutes of application.

Two warning signs:

• No smell at all: it has probably been refined or deodorised.
• Smells of perfume: fragrance has been added, often to mask a low-quality or already rancid oil.

4. The texture: fluid and fast-absorbing

Argan is a light oil. On skin, it should absorb within a minute or two without leaving a greasy film.

A simple test: put a drop on the back of your hand and spread it. If five minutes later there is still a shiny, tacky layer, it has probably been blended with heavier, cheaper oils.

5. The packaging: dark glass, never clear plastic

Light and heat degrade vegetable oils. A producer who looks after their product bottles it in amber or topaz glass, which filters light.

A clear plastic bottle is a poor sign on two counts: it protects the contents less well, and it suggests cost was put ahead of preservation.

6. The price: the arithmetic doesn't lie

With 30 kg of fruit per litre, one harvest a year and a largely manual process, there is a price floor below which pure argan simply doesn't add up.

Always work out the price per millilitre rather than the price of the bottle — it's the only way to compare different sizes. A large, very cheap bottle almost always means dilution.

If you can only check one thing before buying, make it the ingredients list. A single ingredient — Argania spinosa kernel oil — answers nearly every other question on its own.

Storing it once opened

Keep it somewhere cool and out of direct light — a bathroom cabinet away from the shower, or a drawer. Refrigeration isn't necessary.

Once opened, use it within a few months (the packaging shows the period with an open-jar symbol and a figure, for example "12M"). If the smell ever turns sharp or unpleasant, the oil has oxidised and should be discarded.

About the paper test

A widely shared tip suggests dropping oil on paper and waiting for it to evaporate: if a stain remains, the oil is impure. This test does not work for argan, because every vegetable oil leaves a translucent stain, pure or not. Trust the label, the colour and the smell instead.

This article is informational and cosmetic in nature. For any skin or hair condition, please consult a healthcare professional.