Simultaneous determination of nicotinic acid and its four metabolites in rat plasma using high performance liquid chromatography with tandem mass spectrometric detection (LC MS MS). Semantic Scholar Is niacinamide safe? Details Niacin, aka nicotinic acid or Vitamin B3, has several side effects that include flushing, nausea, vomiting, headaches and low blood pressure. These effects are likely results Livogen : the restorative tonic : Vitamin B1, liquid extract of yeast, liquid extract of liver & nicotinic acid. Wellcome Collection Nicotinic acid = 98 59 67 6