The criterion for choosing a shampoo isn’t the ingredient list
“What shampoo should I use for hair loss?” is a classic clinic question. But the criterion isn’t the ingredient list — it’s your scalp’s sebum output. Choosing by ingredients without knowing your scalp type can actually make things worse.
How to check your scalp type
There’s a simple method: wash in the morning and check your scalp 6 hours later. Oily and smelly before 6 hours means oily; fine at 6 hours but greasy by the next day means normal; little change even after a day means dry.
A normal scalp is fine with almost any non-irritating product. The trouble is oily and dry scalps.
Oily scalp — sebum is the problem
Under a magnifier, many hair-loss patients’ scalps are a mess from unmanaged sebum causing inflammation. In severe cases, fungi and bacteria proliferate, bringing seborrheic dermatitis or folliculitis too.
Under a magnifier, I often see that sebum and inflammation are a bigger problem than the hair loss itself. Some patients have both seborrheic dermatitis and folliculitis from fungal and bacterial overgrowth. For them, I say we must fix washing habits and scalp-inflammation control before worrying about shampoo ingredients.
For an oily scalp, remember two things. First, a zinc-based shampoo for dandruff and sebum. Second, if seborrheic dermatitis is present, an antifungal shampoo (e.g., ketoconazole) 1–2 times a week helps. With folliculitis, a prescribed topical antibiotic may be needed. Oily scalps need washing once daily, up to twice in severe cases.
Dry scalp — the skin barrier is the problem
A dry scalp is the opposite. Sebum and moisture vanish easily, damaging the skin barrier and causing scalp inflammation. Choose barrier-protecting, moisturizing products over strong cleansers. Natural humectants like plant extracts or kelp help, and a scalp essence to reinforce moisture is more effective.
| Scalp type | Key care |
|---|---|
| Oily | Zinc shampoo + (if seborrheic) antifungal 1–2×/week; wash 1–2×/day |
| Normal | Any non-irritating product is fine; avoid over-washing |
| Dry | Moisturizing/barrier-protecting shampoo + scalp essence; avoid harsh cleansers |
What shampoo can and can’t do
Shampoo settles the scalp environment — and that’s it. It isn’t a drug that stops hair loss or grows hair, so don’t over-expect. But by not worsening the scalp and minimizing sebum and inflammation, it becomes an environment where hair-loss treatment works better. Honestly, that’s all. If you have questions, reach out for a consultation.
