Skim through

What it does: emollient, perfuming

The science

A clear, colorless, oil-like liquid emollient that can reduce the heavy, greasy feel in products with high oil content. It's also fast-spreading, meaning that it gives the formula a good, nice slip. It absorbs quickly and helps other ingredients to penetrate quicker and deeper.

Benefits for your hair

Promotes smoothness

As an emollient, isopropyl myristate helps to make the hair feel smooth and nice without it being greasy.

Promotes hydration 

Isopropyl myristate is a conditioning agent, meaning that it provides moisture and hydration to the hair and scalp. This is great for those whose hair needs repair, as it can moisturize and heal damaged hair.  

Promotes shininess

Isopropyl myristate gives great gloss and shine to the hair. The boost in shine is due to the added hydration, but also thanks to the emollient factor that smooths the hair overall.

TLDR 

Isopropyl myristate helps to hydrate, smoothen and add shine to hair without leaving it greasy. It helps in allowing other products to penetrate better, too.