Reading labels for curly and coily hair

There is a list. You have seen it: no sulfates, no silicones, no drying alcohols, no parabens. It is repeated with more confidence than almost anything else in cosmetics, and most of it was never tested.

This page is not an argument that the list is worthless. Plenty of people follow it and their hair is better for it, and that is real. It is an argument that the list works for different reasons than it says, and that following it literally causes two specific problems the dermatology literature is quite clear about.

Why the fibre behaves differently

Start with the part that is not disputed, because it explains everything downstream.

Curly and coily hair grows from follicles that are curved rather than straight, producing a coiled, elliptical fibre. The review describes the consequence: this “is thought to cause fiber bending and impair the distribution and absorption of sebum along the hair shaft, leading to increased breakage points, a tendency to form simple knots, and slower growth rates”.

Two things follow. Sebum does not travel down a coiled fibre the way it travels down a straight one, so the ends are drier by geometry rather than by anything you did. And the bends are stress points, so this hair breaks more easily under mechanical force.

Dryness and breakage are the real problems. Almost every rule on the list is an attempt to solve them.

The advice that runs the wrong way

Here is where the received wisdom and the literature part company, and it matters.

The narrative review records that “a common belief that frequent shampoo use leads to dryness and breakage has fostered a cultural adoption of bi-monthly and monthly hair washing, along with prolonged protective styling methods in adults”, and then states the consequence plainly: “This practice increases the risk of developing seborrheic dermatitis and in some cases, traction alopecia (TA).”

Against that: “recent studies suggest that weekly washing of Afro-textured hair with appropriate products regulates the scalp microenvironment and reduces product buildup, both which counter hair breakage”.

Weekly washing, with the right products, is what the evidence supports. Not monthly. The instinct to wash less is protecting the fibre at the cost of the scalp, and the scalp is where the two conditions with the worst outcomes begin.

That is the single most useful sentence on this page and it is the opposite of what most curly hair content says.

Sulfates and silicones are one system, not two villains

The list treats these as separate rules. They are not.

Dimethicone and Amodimethicone are water-insoluble silicones. They condition well and, as the silicone review puts it, “may lead to accumulation if not properly cleansed”. Water-soluble silicones rinse out. Volatile ones evaporate.

So how do you remove the insoluble ones? “While clarifying shampoos containing sulfates, like sodium lauryl sulfate, are often employed to eliminate this residue, excessive usage may result in dryness or even damage to the cuticle.” And: “the removal of water-insoluble silicones requires strong surfactants, which can be harsh on delicate or textured hair.”

Read those together and the actual rule appears. Silicones and sulfates are a matched pair. Using heavy silicones while avoiding sulfates is the configuration that produces buildup. Using sulfates constantly on hair that is already fragile is the configuration that produces dryness. Neither ingredient is the problem; the mismatch is.

A routine that uses water-soluble or volatile silicones needs no sulfate. A routine built on Amodimethicone needs something that will actually take it off.

The alcohol confusion

The list says avoid alcohol. It usually means denatured alcohol, which is a solvent and can be drying at high concentration.

It routinely catches cetearyl alcohol, cetyl alcohol and stearyl alcohol as well, because those names contain the word. Those are fatty alcohols: waxy, long-chain molecules that are chemically unrelated to the ethanol in a drying solvent, despite sharing a word with it.

This is a rule that matches on spelling rather than chemistry, and it removes from consideration some of the most useful conditioning ingredients there are.

When the scalp is the problem

If there is flaking, itching or visible inflammation, that is a scalp condition rather than a hair care question, and the medicated shampoos have monograph concentrations behind them: Pyrithione zinc and Coal tar both appear in the US drug regulations with defined ranges.

Two pieces of practical guidance from the dermatology literature are worth having, because they contradict how most people use these products. Apply medicated shampoo directly to the scalp rather than the hair shafts, which limits the drying effect on the fibre. And prolonged contact time is not needed: leaving it on longer does not make it work better.

Anything that is not settling, or any hair loss that is spreading, belongs with a dermatologist rather than with a shopping list. The reason so much of this is decided in forums rather than in clinics is itself documented in the review, which notes that “perceived clinician cultural incompetence and a lack of knowledge regarding curly hair often lead patients to seek guidance from the community and online forums”. That is a real gap and it is not the reader’s fault.