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Could enhance retinal cell entry improving intracellular delivery

Andrew Huberman: I also, I'm glad that you're mentioning skin as the major kind of interface between the environment and vitamin D synthesis because a lot of people think of skin as just a protective sheath around us or something to adorn ourselves with, earrings or tattoos or whatever

Neuroimaging (MRI of the spinal cord) may occasionally be warranted to exclude other pathology or to demonstrate the characteristic changes of subacute combined degeneration, though this is not routinely required for diagnosis

Statins also deplete it, which is a real concern for people on those drugs Urolithin A: produced when gut bacteria metabolize pomegranate compounds