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Description
Deficiency in vitamin B complex can lead to nerve damage or dysfunction, resulting in sensations like numbness, tingling, or a "pins and needles" feeling in the hands and feet

Nature 491, 458462

doi: 10.1007/s13311-020-00889-4 205

Apply 5 to 10 sprays on the areas that need it most

Whether that trade-off is worth it depends on how much you value convenience and consistency over the lowest possible price per milligram

For a syringe I believe that you can use the same type you use for insulin
