Yes, it is possible to take too much zinc. This can lead to adverse effects and toxicity. Zinc is an essential mineral. However, excessive intake can disrupt the balance of other minerals in your body, like copper and iron. This can lead to deficiencies. Symptoms of zinc toxicity may include nausea, vomiting, diarrhea, headaches and abdominal pain. Follow recommended dosage guidelines. Consult a healthcare professional before starting zinc supplements.