DHS

A chemist named Lorne V. Persōn started a dermatological products company in Glendale, California in 1941, and the striking thing is how little the proposition has changed since. It is still family-run, still in California, and still making the kind of products that get recommended in a consulting room rather than advertised on a billboard.

The shampoo line is organised by active ingredient rather than by hair type, which tells you immediately who it is for. There is a coal tar version for psoriasis and seborrhoeic dermatitis, a zinc version at two percent pyrithione zinc for dandruff and seborrhoeic flares, a salicylic acid version for scale that needs lifting rather than yeast that needs suppressing, and a plain clear version with no active at all for scalps that cannot tolerate much. That structure is a quiet act of honesty: it assumes you know, or your dermatologist knows, which problem you are actually treating.

Coal tar deserves a note, because it is the oldest agent in the category and remains among the more effective for psoriasis, slowing the excessive cell turnover that produces thick adherent scale. It also smells like fresh asphalt, stains fabric and increases sun sensitivity, which is why the industry spent decades trying to replace it and never entirely succeeded.

The honest read is that this is a functional brand with no ambition to be anything else. The formulations are plain, fragrance-light or fragrance-free, and priced without ceremony. What you give up is the sensory experience, since nobody chooses these for the lather or the smell. What you get is a clearly labelled active at a working concentration and the ability to match that active to a diagnosis rather than hoping one bottle covers everything. For anyone managing a chronic scalp condition rather than the occasional flake, that is usually the right trade.

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