Some studies [1317] have described the limitations of trying to diagnose vitamin B12 deficiency exclusively via the measurement of this concentration, and report blood methylmalonic acid (MMA) and homocysteine concentrations to be more sensitive markers capable of detecting subclinical deficiency
Along with there being no reports of it causing birth defects, cancers or any other type of toxicity, Vitamin B12 doesnt even have an established tolerable upper intake level (UL), which is the amount that would cause an overdose or major unwanted side effects
Scientists monitored for common concerns associated with growth hormone, such as changes in IGF-1 levels or insulin resistance, but found no significant issues
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General Comments & Additional Information Clinical info: NORMAL REPORT Ordered Items Methylmalonic Acid, Serum Another way to evaluate the physiological value of B12 is by testing total serum homocysteine