Thank you for your query at DoctorSpring.com.
An episode of flu may result in derangement of insulin resistance and lipid profile results.
Niacin has not been shown to provide any mortality benefit in different trials and publicity that you have heard this drug is correct. Since the report of education in your normal lipid profile test are almost normal in the low fifties you are not a candidate for niacin therapy.
Even if you take your lipids profile as showing hdl levels of 43, if you are a male these levels are normal for a male.
I would not recommend niacin therapy for you.
Please feel free to discuss further,
Dr Vivek Mahajan