Question: How should someone balance a vitamin D of 80 ng/mL with other nutrients?Let's say the idea is to maintain someone on a lifelong level of 80 nanograms per milliliter. Maybe four times the first year, two times the second year, once the third year and then every few years thereafter, I would measure the urinary calcium and make sure that that level is not associated with hypercalciuria in that person. Because if it is, I think you're putting that person at an increased risk of kidney stones if nothing else. And then I would say that person wants to get at least 200 micrograms of vitamin K2. My default would be to say 10,000 IU of vitamin A, just off of the fact that I feel like you're basically doubling the normal amount of vitamin D in someone who is 80 nanograms per milliliter.

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Chris Masterjohn, PhD, is the Founder and Scientific Director of the mitochondria test Mitome.