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(Accessed on October 31, 2024) Means RT
This product is handled exclusively in controlled research settings for in vitro and pre-clinical studies, with no applications in human or veterinary medicine
More binding protein means more B12 is held in the blood, pushing serum levels up
As to the pain "going in" it may be that the needle caught a nerve or vein plus the fact that you were probably a little tense and nervous
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