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You might need a B complex supplement if you can't get the recommended daily amount of B vitamins from your diet
A comparison of immunoassay and bioassay [PMID: 6066964] Laboratory literature summary: Quantitative assay of hCG
Vitamin B12 is also involved in homocysteine metabolism and plays a critical role in proper energy metabolism, immune and nerve functions
Supply math (doses per vial) At once-daily dosing, the 10 mg vial covers roughly nine weeks of research use, while the 50 mg vial (at its larger 2.5 mg documented dose) covers about twenty days
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