I actually heard that vitamin c was supposed to make the effects of marijuana wear off quicker not make them stronger. I heard this from a registered nurse who is also a distributor of medical marijuana so...

As far as your specific question is concerned, too much vitamin c will not harm you. It is water soluble so what your body doesn't need it will piss out. Vitamin E, however, is fat soluble, so it will get stored up in your fat. You can have too much vitamin E but it would be pretty hard to do unless you're taking handfulls of supplements regularly for days. The other ingredients are pretty much harmless as well. Cellulose and lactose are sugars, stearic acid is found natuarlly in many foods we eat. Maize starch is a fancy word for corn starch. Silica is basically sand, you'd have a better chance of being harmed by a bag of sand falling off a truck than eating too much. And finally, the rather evil sounding "%RDA-833" isn't an ingredient at all. It's an indication that 500mg is 833% of the recommended daily amount.