What is considered the optimum serum concentration of vitamin D?

The optimum serum concentration of vitamin D is typically identified within the range of 36-40 ng/ml. This range is often recognized by various health organizations as being sufficient to maintain bone health, support immune function, and promote overall well-being, particularly in older adults who are more susceptible to deficiencies. Maintaining vitamin D levels within this optimal range can help prevent health issues related to bone density and other comorbid conditions that are prevalent in the geriatric population.

While other ranges are cited, the consensus among many experts is that 36-40 ng/ml provides a balance between ensuring adequate vitamin D status and avoiding potential toxicity that can arise with excessively high levels. Therefore, this range is considered ideal for promoting overall health without the risks associated with over-supplementation.