It's not much, but should be enough if you're eating enough of the right things? Still, it's quite safe to take 2-3 EmergenC packets in the same day every now and again. When I have a low-calorie day or a day high in environmental toxins I take more than one packet. If I have a day with few calcium sources I add CalMagFizz to the EmergenC drink and it works out great. :)