Because of copper toxicity. It goes both ways. If you're on zinc for longer than 2-3 weeks it depletes copper and vice versa. Rule of thumb is 15mg to 1mg ratio of zinc to copper.
Because of copper toxicity. It goes both ways. If you're on zinc for longer than 2-3 weeks it depletes copper and vice versa. Rule of thumb is 15mg to 1mg ratio of zinc to copper.