Do you have cholesterol problems? If yes, you’ve probably heard about the B vitamin niacin. You’ve heard this for good reason: Several studies do indeed show that niacin (also called vitamin B3) can raise HDL (good cholesterol) levels by as much as 35% and lower LDL (bad cholesterol) by as much as 25%. Niacin can also lower triglycerides by as much as 50%. Niacin may also lower total cholesterol …