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Individual sensitivity Some people are more prone to post-injection headaches

But for someone with normal B12, injections are not a reliable or proven shortcut to weight loss without behavioral change

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If more than four days have passed, skip the missed dose and continue with your regular schedule

IBS or Inflammatory bowel diseases like Crohns or Ulcerative colitis Short bowel syndrome Pancreatic disease like pancreatitis or pancreatic insufficiency, where the pancreas isnt producing enough enzymes to break down your food

Great way to cure a hangover and keep the party going