Oleic acid tends to be well absorbed by our skin, helping to moisturize and soften it. It offers anti-inflammatory properties as well. Stearic acid offers improved moisture retention, flexibility of the skin, and skin repair. But what do those other fatty acids bring to the mix?
Erucic acid - found in my least favourite family of vegetables, the brassica family - is used as an anti-slip agent in industry because it is a very grippy fatty acid. It doesn't offer slip and glide to your products - quite the opposite in fact! Gadoleic acid is found in cod liver oil - but I have no idea what it does in jojoba oil. (I have found nothing on this fatty acid and its benefits for skin and hair in all my research - and I've done a ton.)
Jojoba oil sinks quickly into the skin in an interesting way - it penetrates through hair follicles - but it does not block those follicles. And jojoba actually mixes with the sebum on our bodies to create a thin non-occlusive layer of jojoba oil and sebum. This is one of the reasons it is said jojoba allows our skin to "breathe" - it isn't occlusive, and mixes with the sebum. Because of this feature, jojoba can help with scalp problems - it can penetrate the hair follicles and loosen oils, which can be washed away.
It contains only a titch of Vitamin E (in the form of tocopherols) at 50 ppm (compare to about 400 ppm in hazelnut oil or 700 ppm in soybean oil), so it's not a great oil for those looking for maximum Vitamin E! We don't really need to add extra Vitamin E to a jojoba oil creation as it does have a very long shelf life - possibly up to 24 months!
Jojoba contains some lovely polyphenols - about 3% tannins - which accounts for the dry feeling of jojoba oil when used neat. And it contains about 0.5% phytosterols, which penetrate into the skin, rather than occluding it, which can reduce inflammation and itching, as well as moisturizing.
Studies of jojoba oil - of which there have been few, it seems! - show it might alleviate the effects of psoriasis and acne, but there is no indication of how much to use or how to use it (in a lotion, neat, and so on.) Studies have also shown jojoba oil can significantly soften skin.
Jojoba oil has a shelf life of about 2 years, and a HLB value of 6. It is used in hair and skin care at up to 25% - because it is considered a dry emollient, it might feel too dry at higher levels. It is considered non-comedogenic and non-allergic. It is, despite its weight, a non-occlusive oil that will sink into skin and hair follicles for extra moisturization. And it is considered an excellent emollient.