Dr. Robert Heaney is one of the leading researchers in the quickly-advancing field of vitamin D research. He recently gave a fascinating lecture at UC Berkley in which he summed up the most current information about vitamin D and took on difficult-to-answer questions about vitamin D deficiency and dose. Dr. Heaney’s information is compelling and commands a complete rethink of this crucial prohormone nutrient. The video has since been removed from YouTube, but we were able to see it and took some notes. Here’s what this leading researcher had to say about vitamin D.