The Microbiology of Underarm Odor & Bacterial Enzymes
Human sweat produced by eccrine and apocrine glands is naturally 100% odorless water, proteins, and lipids. Body odor is generated exclusively by resident skin bacteria (primarily Corynebacterium and Staphylococcus hominis).
These bacteria produce enzymes called C-T lyases that metabolize odorless apocrine secretions into volatile thioalcohols (the chemical compounds responsible for pungent pungent body odor). These bacterial enzymes require an alkaline or neutral pH (6.0 to 7.5) to function. Applying mandelic or lactic acid drops underarm pH to approximately 3.8. In this acidic environment, the bacterial enzymes are permanently inhibited: the bacteria cannot metabolize sweat, completely stopping odor generation at the biological source.
The Post-Shaving Caution
Because alpha-hydroxy acids are chemical exfoliants, applying high-concentration glycolic acid immediately after dragging a multi-blade razor across skin can cause a stinging sensation.
Choose formulas enriched with soothing aloe and hyaluronic acid (like Kosas Chemistry or Lume), or wait 10 minutes after shaving before applying your acid deodorant.