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The median age was 61 years (range 26 to 83 years)

Not all colors are normal

And just like research has shown that Pluto is no longer considered a planet, B4, B8, B10 and B11 have been proven not to fit the criteria for vitamin status

L. I. Fedoreyeva, I. I. Kireev, V. Kh. Khavinson, and B. F. Vanyushin, Penetration of short fluorescence-labeled peptides into the nucleus in HeLa cells and in vitro specific interaction of the peptides with deoxyribooligonucleotides and DNA, Pleiades Publishing Ltd, Nov. 2011. doi: 10.1134/s0006297911110022

There are many reasons why one might not get enough Vitamin D: you may be lactose intolerant, or you may live in Minnesota and not see the sun for six months out of the year