Nausea or Diarrhoea In rare cases, Vitamin B12 shots can cause gastrointestinal discomfort such as nausea or diarrhoea
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That matters because, unlike most peptides, a small molecule can be studied orally as well as by injection it has no peptide bonds for digestive enzymes to cleave
NAD+: Universal coenzyme central to metabolism, DNA repair, and sirtuin activation
National Heart, Lung, and Blood Institute
Vegetarians and vegans can suffer from B12 deficiency, so can meat eaters, making B12 deficiency a common concern many people solve with supplementation or a B12 injection