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Please be aware that if you are already getting enough zinc from dietary sources, taking a full serving of this supplement will cause you to overdose. My sister experienced an overdose after only a dropper full, and that isn't even a full serving. Start off with one or two drops a day and track your reactions. Unless you have blood labs telling you that you have a severe deficiency, it's better to start with a small dose and increase until you feel a positive difference. If you get headaches from taking this, that is a sign of overdose. Hope this helps. Stay safe everyone!