Weight doesn't affect how much you are paid.. It only affects the volume of plasma you donate
If your weight is to low I've seen them turn people down because of it. Idk why but I've seen them do it. They also check your protein level so if your kinda small and don't weigh much I'd make sure I eat something with a high protein content like peanut butter or take some protein powder about 2 hrs before you get there. I make a protein shake before I go because I've been turned down for that day due to low protein level but haven't had a problem with that since I've started doing it.
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