How do I use argan oil: on the hair or directly on the scalp? And how often?

Argan oil has gained popularity in the world of hair care for its reputation as "liquid gold." Brands promote it to hydrate, repair, and add shine to the hair. But when it comes to application, many people wonder: is it better to apply it directly to the scalp or just on the hair? And also, how often should it be used to see real benefits without damaging the scalp or oversaturating the hair strand?

What the scalp needs (and what it doesn't)

The scalp is skin, and like all skin, it produces its own natural oil called sebum. In many people, the scalp has a delicate balance: it can become dry or produce excess oil. Applying oils directly to this area can have different effects depending on the skin type and pre-existing conditions.

There are no good studies on how often to use argan oil, or on whether to put it on the scalp. A 2022 systematic review found no significant evidence that argan oil improves hair growth or hair quality (Phong et al., Journal of Drugs in Dermatology). Oils left on the scalp can build up, and people with seborrheic dermatitis or an oily scalp may find that oils make it worse.

Dry hair: is argan oil a relief?

Using argan oil on the hair itself is the most common use. Like other oils, it coats the hair shaft, which can make hair feel softer, look shinier and frizz less. This is a cosmetic effect on the hair, not a treatment for the scalp or for hair loss.

Directly on the scalp? Only if...

Some people put argan oil on the scalp for dryness or mild flaking. No controlled study has tested this. If you use it on the scalp, use a small amount and wash it out. Stop if it itches, reddens or swells. Flaking with redness, thick plaques or ongoing itching can be seborrheic dermatitis or psoriasis, which need a proper diagnosis.

Allergy warning. Allergic reactions to argan oil have been reported, including allergic contact dermatitis and, rarely, severe allergic reactions (anaphylaxis) (Astier et al., 2010; Veraldi et al., 2016). Try a small amount on a patch of skin first.

The ideal frequency: not too little, not too much

There is no evidence-based schedule. People commonly apply a few drops to the lengths and ends of the hair, a few times a week, or use it as a pre-wash mask about once a week. If you try it on the scalp, start with occasional use, wash it out, and watch how your skin responds.

So, where and when should you use it?

Argan oil is mainly a hair conditioner. People usually put a small amount on the lengths of the hair, not the scalp. There is no evidence-based schedule for how often to use it. If you use it on the scalp, wash it out and stop if it itches or reddens. Do not use it in place of treatment for a scalp condition.

References

• Phong, C., Lee, V., Yale, K., Sung, C., & Mesinkovska, N. (2022). Coconut, castor, and argan oil for hair in skin of color patients: A systematic review. Journal of Drugs in Dermatology, 21(7), 751–757. PMID 35816075.

• Astier, C., et al. (2010). Anaphylaxis to argan oil. Allergy, 65(5). PMID 19839978.

• Veraldi, S., et al. (2016). Allergic contact dermatitis caused by argan oil. Dermatitis, 27(6). PMID 27775969.