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It affects teens with heavy menstrual cycles, older adults with GI bleeding, and anyone with a poor diet or malabsorption issues

Safety and Efficacy of NA-931 and Tirzepatide in Adults Who Are Overweight or Obese Accessed August 3rd 2025

Archived from the original on November 6, 2013

Each ingredient on its own is either Category A (B) or essential with no evidence of harm at normal levels (B, B, B) or Category C in very high doses (niacin)

The deficiency needs to be corrected through supplementation that bypasses the damaged absorption pathway, while the underlying gut or pancreatic condition is treated separately

You can see a table detailing this below and at 1:21 in my video Do Vitamin B12 Supplements Cause Acne