Citracal vitamins are some of the most popular, especially here in the US. The big question is, are they halal? I found conflicting information online regarding this issue and decided to email the company to directly confirm whether or not their vitamins are halal. The following is a screenshot of my correspondence with the company:
Thus, Citracal vitamins are NOT halal. Although polyvinyl alcohol is halal since it is just a synthetic polymer, the fact that the vitamins contain animal-derived ingredients (as confirmed in the above email) makes them NOT suitable for Muslims.
And Allah knows best.