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Mental Impairment Low B12 levels can worsen mental function, especially in older adults
The same studies can be located independently on PubMed using the CAS number (221231-10-3) or the compound name
Lack of response may indicate incorrect diagnosis, concurrent deficiencies, or inadequate treatment frequency
PMID 29318504
As I said, becoming symptomatic quickly may indicate that more frequent/lower dose B12 is a better treatment strategy, not that liver or other stores cannot be utilized
