do vitamin b12 injections have side effects Injection Effects: What to Expect can b12 injections cause dehydration

Effects seen after administration: Vitamin B12 Injection Shows Quick Effects.-Picture Courtesy: The Well Dog Place Vitamin b12 when given as oral supplement, it takes time to reach systemic circulation thats why it takes time to show effects after administration

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Other signs include digestive issues like diarrhea or constipation, and mouth ulcers

Vitamin B12 deficiency can occur through insufficient diet (e.g., un-supplemented veganism or absorption issues (e.g., pernicious anaemia) Treatment for B12 deficiency is regular intramuscular injections until symptoms improve