Americans especially like to advertise stuff to people as if people are idiots. Agreed - most of the time they would be correct in assuming so. However, when it could potentially adversely affect your well being I think they have gone overboard. Look at the bottle of nice carrot juice below:

If your RDA (Recommended Daily Allowance) is determined to be x, and you consume 7x of it per day, I presume you would be 7 times as healthy? Logic suggests that by this reasoning, the RDA should be infinite. Why? Because if 7x is 700% better than x, then surely 100x is 10000% better, and so on.

Little do people realize there is an UL (Upper Limit) to these daily recommendations. For an adult for Vitamin A it is set to 10000 IU (the RDS is 3000 IU). Now I agree these are not exact and open to change, but multiple studies have shown that an excess of most things will cause harm. Even Vitamin A - an excess will interfere with bone metabolism. If you consume your 700% RDA carrot juice daily, it means you are consuming 21000 IU daily, more than twice the daily upper limit. That can surely NOT be good for you.

So stop false advertising.