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They skip the stomach and go straight into the blood

So people at greatest risk for deficiency include those with low stomach acid (e.g., older adults and people on proton pump inhibitors or antacids) or low IF production (known as pernicious anemia), people on medications that interfere with B12 absorption (such as metformin), people who have had gastric surgery, those with GI conditions that impair nutrient absorption (like celiac or Crohn's disease), and people on vegan and vegetarian diets

however, unlike nicotinic acid, niacinamide does not usually cause the intense flushing reaction (redness/itching) of the skin

A review in Current Sports Medicine Reports warned of the widespread use of peptides from non-clinical suppliers, highlighting the lack of sterility and the high incidence of batch inconsistencies (1)