Hydrolyzed Jojoba Esters

Hydrolyzed Jojoba Esters (HJE) are an emollient and skin-conditioning agent made by breaking down jojoba oil into a blend of fatty acids and fatty alcohols.

Jojoba is pretty cool because it's a liquid wax ester rather than a triglyceride like most plant oils. Its structure closely resembles the wax esters in human sebum so it slots nicely into the skin's own lipid layer.

In cosmetics, HJE works mainly to soften skin, reinforce the barrier, and lock in moisture by reducing water loss. This ingredient also holds onto the skin even after rinsing which is why you'll see it in cleansers or wipes.

There's a decent clinical backing for the moisturizing claims: a small controlled study found that pairing HJE with glycerin lowered transepidermal water loss significantly than glycerin alone (and this effect lasted up to 24 hours).

Follow-up work showed HJE appear to "trap" glycerin in the film they form on skin to boost its hydrating power.

Typical use levels are low: the glycering-synergy research used around 1.25% (a common pairing is roughly 1.25% HJE and 3.75% glycerin).

This ingredient has been found safe as used in cosmetics with low irritation risk.

As for fungal acne, the fatty acids and alcohols in jojoba fall in roughly the C18-24 range. This overlaps the C11-24 window that Malassezia yeast can feed on in lab studies, so this ingredient may not be fungal acne safe.