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[73] Streptomyces griseus , a bacterium once thought to be a fungus, was the commercial source of vitamin B 12 for many years
[2] The vitamin can also be supplied on prescription and delivered via injection or other means
How to Test for Functional Vitamin B12 Deficiency Many doctors mistakenly rely on serum B12 levels in the blood to test for vitamin B12 deficiency
10 mL bottles are the common research-supply size
Gastrointestinal Symptoms A B12 deficiency may cause symptoms such as bloating, gas, nausea, diarrhea, constipation, decreased appetite, and weight loss
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