- 545 of the 1035 people who received niacin supplements saw an increase in their blood sugar levels. - 725 of the 750 participants who did not receive niacin supplements did not see increases in their blood sunar levels. - 545 of the 1035 people who received niacin supplements saw an increase in their blood sugar levels. - 725 of the 750 participants who did not receive niacin supplements did not see increases in their blood sunar levels