The excretion of trace metals in human sweat
“sweat appears to be an important excretory pathway for zinc and copper.”
Copper is used to reduce sweating (perspiration).
Copper chloride antiperspirant action
“Otherwise stated, this corresponds to a sweat area reduction of 84% ± 9% (std. dev.). The data for the decrease in sweating was statistically significant (P<0.001).” “We conclude that copper chloride dihydrate is an antiperspirant, under our experimental conditions.”
A company sells a copper chloride deodorant: http://coppermedicalcompany.com/copper-based-products/