Also, preservative or no preservative and why? We used to use preservative and it was usually the big question each and every time. I was told it depended if the lab wanted it or not and they were always changing their minds. As of recent, the consenses had been no. I know it gets sent to a lab in CA but I don't believe it is Endocrine Science. I can't think of the name, if someone said it I would know (I have always been great at multiple choice! :)  ) Let me know.