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others are also possible
When B12 is low, you might feel tired, weak, confused, or irritable

Common Causes of Injection Reactions Histamine release from immune cells in the skin Sensitivity to specific peptide structures Minor tissue trauma from the injection Injection volume or concentration Irritation from bacteriostatic water Why Some People React More Than Others Individuals with more reactive immune systems may experience stronger responses

10.1097/00006534-200005000-00019 81 NumataY.TeruiT.OkuyamaR.HirasawaN.SugiuraY.MiyoshiI.et al (2006)
