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Skin and subcutaneous adipose layer thickness in adults with diabetes at sites used for insulin injections: implications for needle length recommendations Shorter needles are also less painful, because they penetrate less tissue: The needle lengths that were once recommended for SC injection (for adults, 8 mm

Absorption Injected free B12 diffuses through the extracellular fluid into nearby capillaries, enters the bloodstream and binds to TCII (transcobalamin II)
