Not every odor after forty is nonenal — and the wrong diagnosis wastes months on products that cannot work. Here is how to tell the two apart in one evening.
Five questions
- Where? Armpits and feet → classic bacterial odor. Neck, chest, upper back, pillow → nonenal.
- When? After exertion → sweat-driven. Constant low hum, worst on waking → nonenal.
- What does it smell like? Sharp and sour → bacteria. Greasy, waxy, like old books or stale beer → nonenal.
- Does deodorant fix it? Yes → it was sweat. No effect → nonenal.
- Who smells it? You do → likely sweat. Everyone but you → nonenal; olfactory adaptation hides your own baseline.
Why the distinction matters
Bacterial odor responds to ordinary hygiene and antiperspirant. Nonenal responds to neither — it needs tannin chemistry, which is a different aisle entirely. Using antibacterial bars against nonenal actually backfires by stripping mature skin (details here).
If it is both
Common after fifty: deodorant for the apocrine zones, kakishibu soap for the lipid zones. The two do not interfere, and the routine adds under a minute.
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