Shea butter appears on the label of an enormous number of hair and body products, usually without much explanation. Here is what it is and what it is doing there.

What it is

Shea butter is a fat extracted from the nut of the shea tree, which grows across West and Central Africa. At room temperature it is a soft solid, which is why it turns up in balms and thick creams as often as in wash-off products.

What is in it

Two things make it useful for hair and skin:

  • Vitamins A and E. Both are antioxidants, and vitamin E in particular is widely used in hair products to help condition.
  • Essential fatty acids. These are what give shea butter its emollient quality — the property of softening and smoothing by sitting on the surface and reducing water loss.

What it does for hair

Three things, mostly:

  • Moisture retention. As an emollient it helps lock moisture in rather than adding it, which is why it works best applied to damp hair.
  • Less frizz. Frizz is largely a raised, roughened cuticle. Smoothing the surface helps it lie flatter, so hair reflects light more evenly.
  • More shine. A smoother surface is a shinier one. This is the same mechanism, not a separate effect.

Who it suits

Shea butter is heavier than many conditioning agents, which makes it excellent for dry, coarse, curly, or chemically treated hair. If your hair is very fine or gets oily quickly, use it on mid-lengths and ends rather than the scalp, and rinse thoroughly.

Shea butter and keratin together

They do different jobs, which is why they often appear side by side. Keratin is the structural protein hair is made of — it works on the hair fibre itself, helping smooth the overlapping cuticle cells and protect against breakage, frizz, and heat damage. Shea butter works on the surface, sealing and softening.

One reinforces the strand, the other conditions what surrounds it. Our shea butter shampoo and conditioner uses both, with the shampoo and conditioner sharing a single flip-top bottle.

How to get the most from it

  1. Apply conditioner to damp, not soaking hair — emollients seal in the water already there.
  2. Concentrate on mid-lengths and ends, which are older and drier than roots.
  3. Give it one to two minutes before rinsing.
  4. Rinse thoroughly. Residue reads as greasiness, not conditioning.

Used that way, it is one of the more reliable ingredients on the shelf.