What physiological byproduct, related to sulfur compounds, is sometimes excreted through the skin causing body odor?

Answer

Sulfur compounds

The very organic sulfur compounds that give onions their distinctive smell and provide systemic benefits are also the source of potential external odor issues. Once metabolized by the body, these sulfur compounds are excreted through various pathways, including the skin, which can result in a noticeable onion scent in perspiration. This observation leads to the theory that if one experiences the positive internal feelings without this external byproduct, it suggests an efficient metabolic process that handles these compounds internally rather than excreting them noticeably through the pores.

What physiological byproduct, related to sulfur compounds, is sometimes excreted through the skin causing body odor?
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