Do you have PCOS? My strong odor is from imbalanced hormones, if you were on Spiro sounds like you have PCOS too (or maybe t dominant like I am).
I didn't notice a difference with Zinc but I do take Magnesium every night for laxative purposes. If you have PCOS and Niacin worked for you, I'll try it too. What type of smell did you have? I have onion odor from armpits, boob sweat and a crotch smell-- all so strong it can fill a room.