Let's say that, through a balanced diet and nutritional supplements, you're getting all the nutrients you need into your body. Now, is your body absorbing and using them?
The best way to promote nutrient absorption is to eat whole, raw foods (like fruits, vegetables, and legumes). Any time we process food, we are potentially damaging the cellular structure of the nutrients, and therefore missing out on the health benefits -- and in some cases, the mutated nutrient form can actually be detrimental to our health.
So the moment you start cooking meat or pasteurizing milk and juices (even if these processes are required for making food safe to eat; and many people claim that this is up to debate), you are in fact modifying the food, and the body has to try absorbing nutrients from that modified food.
Any health supplement in the world is obviously ALSO modified, which is why these should SUPPORT but not replace a balanced diet. The less processed a supplement is, the more ideal in terms of absorption. And most sources agree that a liquid supplement will get absorbed into the body more readily than any pill.