There's been about other threads on this topic, which is okay with me because now I can make another attempt at getting a clear answer after I address a few things concerning multiples.
I'm not so interested in brands, but more so, what exactly makes a multivitamin "good", "quality", or the best for that matter. Where's the proof that any multivitamin is any of the preceding?
Another thing, how do you know your multivitamin is absorbing? Throwing ingredients into a matrix in the form of a tablet or capsule does not ensure in any way, shape, or form, that they will reach their specified destination in the gastrointestinal tract to deliver maximum benefit. One good example could be calcium products that are compressed into a tablet: most of them simply pass all the way through your digestive tract intact like a pebble. It's difficult to achieve bioavailability in a supplement if you have don't have the technology and the know-how (aka research) to do so.
There's been rigorous analytical testing done on vitamin B-complex supplements. In one test, 13 brands were tested and found 9 failed to dissolve folic acid. Amongst the many errors in the tested brands, the main problem lay in the formulation of the product in which the folic acid is incorporated in the core, or the inside, of the pill. Unfortunately, when this is the case, the folic acid gets caught up in the matrix (not with Keanu Reeves ) and fails to achieve absorption. In turn, the expected health benefits are not attained by the consumer. This is just one example and it may not seem like much of an issue now, but it will at one point in our lives, especially in the lives of pregnant woman in which folic acid is crucial in the prevention of neural defects. A multi should be able to absorb efficiently regardless of how many comprise one serving (i.e. 100% of every essential nutrient). Logically speaking, the chances of high bioavailability in a one-a-day vs. a two-a-day are slim. It would also be more convenient to split a 2 tablet daily serving than having to perform surgery on 1 tablet in order to split up your daily dosage! A good multiple is going to contain all the vital nutrients the body requires to function efficiently and it will contain them in ratios that will allow them to be utilized by the body. If you're looking at a product that has 1333% of Riboflavin and 13% of Biotin--we have a problem. In that particular case, more so because the company is shorting you on Biotin, which is a very important (and expensive) B vitamin.
Some multiples even contain delivery systems to ensure you are absorbing certain vitamins that are typically caught up in the digestion matrix (e.g. folic acid). We're not taking into account, of course, that a good multiple will be clinically proven to be bioavailable. My reasoning is on the basis that we're talking about a 2+ a day multiple, not one-a-days, in which case you can definitely split the servings into 1/morning and 1/evening. I personally don't supplement abiding by the RDAs but by the ODIs (Optimal Daily Intake). The problem with most one-a-day multi-vitamins is that they contain too many components, some of which are not needed, some of which may interfere with each other.