Every song has a composer every book has an author every car has a maker every painting has a painter and every building has a builder. So it isn't irrational to take this simple logic a little further and say that nature must have had a Maker. It would be irrational to believe that it made itself.
Low levels of vitamin D in the population as a whole suggest that most people need to take a vitamin D supplement. This may be especially true for seniors as the ability to synthesize vitamin D in the skin declines with age.
