--Vodka's is traditionally made from potatoes, not corn. Strike one
--ALL alcohol is steam distilled - pesticide/herbicide residuals left after steam-distillation? I've never claimed to be a rocket-scientist, but methinks the answer is ZERO. Strike two (likely)
--Corn allergens? Grape allergens? I've never heard of anyone with produce/grain allergies being allergic to steam distilled alcohol made from the grain or produce they're allergic to...but if that's possible, the difference between corn or grape only matters to those with corn or grape allergens. Strike three (likely)
Gimic. (methinks)
My top four recommended tincture sources: 1) me/you 2) Dr Schulze 3) Health Freedom Resources 4) HerbPharm