when b12 injections don t work How Often Should You Get Vitamin Injections? How to Give a B12

This contrasts sharply with full-length human growth hormone, which can impair glucose tolerance and insulin sensitivity, potentially precipitating or worsening diabetes

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So reserves of this vitamin get depleted quickly in sick cats, and this causes low B12 levels

Approximately one year later, he experienced a severe worsening of his previously very mild neuropathy, and lab evaluation yielded a serum B12 of 220 pmol/l (which is normal, remember!?), but an elevated serum MMA of 1300 nmol/l, supporting the existence of true B12 deficiency