Simmondsia Chinensis (Jojoba) Seed Oil

What it is

Jojoba comes from the seeds of a desert shrub grown in the American southwest, Mexico and Israel. Chemically it is not a triglyceride oil at all: about 98% of it is wax esters, the same broad class of molecule that makes up a substantial part of human sebum, with small amounts of sterols, tocopherols and free fatty acids. That structure gives it a distinctive light, non-tacky feel and an exceptionally long shelf life.

What it does well

• Closely mimics the skin's own surface wax esters

  Human sebum is roughly a quarter wax esters, and jojoba is almost entirely wax esters, which is the usual explanation for why it absorbs without the greasy residue of a triglyceride oil. Reviews of jojoba in skincare report benefits for dry skin and stratum corneum integrity, though controlled trials are scarce.

  Moderate evidence

• Very stable, so products containing it keep well

  Wax esters have far fewer oxidation-prone double bonds than a polyunsaturated seed oil, and jojoba is consistently described in chemistry reviews as one of the most oxidation-resistant natural cosmetic lipids. This is why it turns up in balms and anhydrous products that sit on a shelf for years.

  Strong evidence

• Some preliminary evidence in mild acne

  In a 194-participant open pilot study, a clay-and-jojoba-oil facial mask used two to three times weekly for six weeks was followed by a 54% mean reduction in total lesion count. There was no control group, so the clay, the routine, and natural fluctuation cannot be separated from the jojoba.

  Limited evidence

Worth knowing

• The acne evidence is much weaker than it is often presented

  The frequently cited jojoba acne study was an uncontrolled, self-reported pilot in which participants never met the study physician. It is a reasonable signal to investigate, not proof of an effect.

  Matters most toAnyone buying jojoba specifically as an acne treatment.

• Contact allergy is reported but uncommon

  Case reports of allergic contact dermatitis to jojoba exist in the dermatology literature. Given how widely jojoba is used, the rate appears very low.

  Matters most toPeople with unexplained facial dermatitis working through a patch-test series.

Where the EU stands

Sources (3)

Every link goes to the original: a journal, a PubMed record or an EU document.

1. [1]
   An updated review on efficacy and benefits of sweet almond, evening primrose and jojoba oils in skin care applications

   International Journal of Cosmetic Science · 2022 · doi:10.1111/ics.12758

   Concluded these three oils can strengthen stratum corneum integrity and recovery, while noting discrepancies in the clinical data and questionable study designs across the literature.

2. [2]
   Jojoba Oil: An Updated Comprehensive Review on Chemistry, Pharmaceutical Uses, and Toxicity

   Polymers · 2021 · doi:10.3390/polym13111711

   Documents that jojoba is around 98% wax esters rather than triglycerides, and summarises its antioxidant, anti-acne and anti-inflammatory activity alongside a favourable toxicity profile.

3. [3]
   Clay jojoba oil facial mask for lesioned skin and mild acne - results of a prospective, observational pilot study

   Forschende Komplementarmedizin · 2012 · doi:10.1159/000338076

   An uncontrolled pilot in 194 people found a 54% mean reduction in lesion count after six weeks of clay-jojoba masks, giving preliminary but not confirmatory evidence.