A serum B12 level test and, ideally, a methylmalonic acid (MMA) test should precede any B12 injection recommendation
[DOI] [PMC free article] [PubMed] [Google Scholar] 45.Kralj T., Kokot A., Zlatar M., Masnec S., Kasnik Kovac K., Milkovic Perisa M., Batelja Vuletic L., Giljanovic A., Strbe S., Sikiric S., et al
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First, it works through beta-3 adrenergic receptors, which are predominantly expressed in adipose tissue with limited expression in most other tissues
Human data is still very limited, including small pilot work such as the knee pain survey of 16 patients, plus a few other early studies and reviews calling out the lack of large, rigorous trials