The Institute of Medicine states no adverse effects have been associated with excess vitamin B12 intake from food and supplements in healthy individuals. [1] However, it is important not to start a high-dosage supplement of any kind without first checking with your doctor
Walking and low-impact cardio are beneficial for cardiovascular health but do not provide sufficient osteogenic stimulus to meaningfully protect bone density during rapid weight loss
doi:10.1093/humupd/dmz019 Outeirino-Iglesias V, Romani-Perez M, Gonzalez-Matias LC, Vigo E, Mallo F
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However, most patients do not experience serious symptoms, with one study showing only 4% of patients experienced intense diarrhea