From what I've come to believe, still so after reading the article, is that most of the vitamins you intake are passed through urine. For whatever reason. I do think some have more uptake than others, but the most and only true fire way to ensure you're getting all the essential vitamins is through your diet. I won't preach what constitutes a healthy and balanced diet, but from my understanding the vitamin absorption through digestable foods is far superior to taking a multivitamin, especially when using them to cover some supposed deficient one likely has