Why do vitamin jars come with cotton balls? What purpose do they serve? and should I leave it in there after I've opened it?
It soaks up the moisture. If you're taking them regularly and go through them pretty quick then it isnt necessary. If they're just going to sit around, it's best to leave the cotton in...
its got to do with keeping the vitamins fresh. it soaks up moisture and stuff. just keep it in the jar with the vitamins.