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The most common cause of numbness is nerve damage or nerve compression in the hand

Vitamin B12 (cobalamin) refers to a group of chemically-related cobalt containing molecules involved in cell processes such as DNA synthesis, fatty acid synthesis, energy production and regulation

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Abstract Background: Nasal drug delivery offers a non-invasive route with rapid absorption and the ability to bypass first-pass metabolism, making it promising for central nervous system (CNS) disorders, nasal diseases such as allergic rhinitis, and other chronic conditions by enabling targeted delivery and crossing the blood-brain barrier