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Some patients feel as though they want more frequent injections, and occasionally we test levels to see if they are receiving adequate replacement, but Im not sure how strong the evidence is to support this. GPs should consider periodic vitamin B12 testing of higher-risk patients who take metformin, even if they dont display symptoms of deficiency, the UK medicines regulator said earlier this year
The debilitating fatigue which seems to be the most common symtpom of B12 deficiency may be due to a combination of neurological factors, anaemia, and the role of B12 in the mitochondria
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Purity alone does not prove identity, lot traceability, labeling consistency, storage history, or handling controls
For broader pharmacokinetic context, see Peptide Half-Life Explained: Why Some Peptides Last Hours and Others Days
The evidence base for the proposed use and its limitations: primarily preclinical, or limited human studies not conducted under Western regulatory standards
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