These are the chemicals that give teens pungent body odor

Body odor changes through development,” says chemist Helene Loos of Friedrich-Alexander-Universität Erlangen-Nürnberg in Germany. “There is a really great diversity of different odor compounds that are present in body odors.”

Loos and colleagues collected body odor samples from 18 teens age 14 to 18 and 18 young children age 0 to 3 who had slept with cotton pads under their arms for a night. Separating the body odor into individual components revealed that young children and teens have over 40 compounds in common.

While some classes of chemicals showed no difference between age groups, the scents of carboxylic acids were more prevalent in teens. These compounds were a mix of pleasant scents, described by a panel trained to evaluate olfactory cues as fruity, soapy or grassy, and less-appealing ones that smelled cheesy, musty or goatlike.

Researchers also identified two steroids present only in the teens’ body odor. One, called 5α-androst-16-en-3-one, smells of sweat, urine and musk. The other, called 5α-androst-16-en-3α-ol, smells of musk and sandalwood.

A few components of scented products also turned up, despite participants avoiding deodorant and using unscented body wash and detergent for two days prior to the study.

Notably, some compounds known to contribute to strong body odor weren’t detected, says biochemist Andreas Natsch of Givaudan, a fragrance and flavor manufacturer headquartered in Vernier, Switzerland. Those chemicals might require different detection techniques, or they may show up more after exercising or working up a sweat