In any case, I think this may be missing the point. Even if one has deficiencies, the best way to supplement may not be vitamins but with food. What the report, and most reports I have read are saying, is that most of supplements either get excreted or build up. If excreted, they put additional burden on the liver. If they build up, they may cause other harm to the body. Non food supplements do not actually get usefully absorbed into the body. This is not new research. This has been known. Which is why supplement advertising tends to focus on 'bioavailability' and the fact that the supplement contains thousands of time the dialy requirement. However, just be a supplement has bio available ingredients does not mean that it actually gets absorbed, and just because there is a lot of it does not mean it is more likely to get absorbed. Sinking your body into a swimming pool does not mean you get more hydrated, it just means you drown.
This complicated absorption scenario goes beyond vitamins. For instance milk has been recommended as an important food product because it has a large amount of calcium. However, it has been suggested that high levels of protien can block calcuim abortion. So it could be that vegetables like collard greens and okra could be a better source of calcium, as more of it will get absorbed, and less will have to be excreted.
Honestly, about the only thing that supplements has been proven to cause is extremely expensive urine.