I don't know how much is too much because I didn't realize what was wrong with me for a while. I took liquid ionic zinc as it was more absorbable with green tea extract that acted as a mild ionophore per what I've heard on MedCram on YouTube. I took it a few times every week for almost a year with a break or two and then stopped taking it completely except if I feel a hint of a sore throat or drippy nose. Copper suppliments are rough on the stomach, I started to snack on cacao nibs instead. Also I cooked beef liver, cut it into pieces, froze it and ate a piece each day straight from the freezer. You could just buy beef liver suppliments but they're expensive, or just take Copper.