How to consume this? Is there a general serving size?

It is in resin form. So, you will need a shilajit spoon (or anything similar) to take about half a green pea size portion which is around 300mg. Then dissolve this into warm water or warm beverages to consume. Depending on body weight up to 500mg (whole green pea size) portion per day is a good dose to consume. Per serving size is 300mg on average.