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Description
However, there is good evidence that, although folic acid binds avidly to this receptor in the choroid plexus, it does not cross the opposite, apical membrane to enter the cerebrospinal fluid (CSF) (78)

It is not listed on the 503B compounding bulk substances list (per FDA Warning Letter, Jan 2026)

Fortunately, treatment is widely available, inexpensive, and effective

What you should do You can safely take both levothyroxine and vitamin B12

Biochemistry 57 , 827838 (2018)

Once the substance enters the capillaries surrounding the stomach and small intestines, it enters passageways that lead to the portal vein, which passes through the liver and branches out into the capillaries
