Are you sure it says one spoonful, or does it say one scoop? Powders usually come with a small scoop in the jar that is 1g or 1000mg. As far as the gram, that's 1000mg. There's not reason for you to take that much at one time, that's your choice. You don't need that much unless you have some specific need for it. If you do want to take that much in a day, it's better to take half twice a day, as Vitamin C is water soluble and you will evacuate it. It is best used in a buffered form with bioflavanoids for best antioxidant performance. It is best absorbed take with food, which provides a natural buffer. It is very acidic, so taking it with food or buffering it helps. You don't say ow much you intend to take in a day, so these are just suggestions, but again, powders usually come with a scoop and that's your measurement. If it didn't, what size spoon are you using? What size does it suggest? That should answer your question.