An affiliate shopping post reports that 'old person smell,' caused by a compound called 2-nonenal that appears starting around age 40, is a real dermatological phenomenon distinct from regular body odor. A dermatologist quoted in the piece says persimmon-tannin soap has a 'plausible mechanism' and a long history of use, while also noting that large randomized trials are lacking.
The featured $23 bar, whose founder appeared on a reality investment show, is described as the most popular and widely reviewed option in the category, though the article does not identify who determined that ranking.
The full dispatch is available from the source below.