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Heart palpitations and shortness of breath: B12 deficiency can impact the cardiovascular system, leading to palpitations and a rapid heartbeat
No tolerance development has been documented, suggesting ongoing benefits with consistent use
Some people may also experience reduced appetite, stomach discomfort, bloating, fatigue, headache, dizziness, or an injection-site reaction
10.3324/haematol.2018.190876 Haematologica 57 InamotoY.KimuraF.KandaJ.SugitaJ.IkegameK.NakasoneH.et al (2016)
Anxiety can deepen the same loop, since excessive worry often brings muscle tension, restlessness, and trouble concentrating, symptoms detailed by the Mayo Clinic in its guide to generalized anxiety disorder
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