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Hmmm... not at a pharmacy I'm guessing (though go ahead and ask! I don't think they have much testing equipment at a retail pharmacy. Maybe a pharmaceutical lab
). I'm not a lab monkey but I would guess that maybe gas chromatography or something similar would be needed? Why do you need to know the strength? Couldn't it be inferred from the recipe (X grams propolis in Y grams ETOH = a Z-strength solution)?