What amount niacin should I take?

None. You're 38. What is your indication for taking niacin? If you have high cholesterol, change your diet and life style.
Niacin. Supplementing with 2000-3000mg of flush free Niacin daily can help to control your cholesterol levels quite nicely, even increasing your HDL and converting your LDL to a less harmful subtype. As a negative, Niacin can cause facial flushing and redness so get the flush free variety. And have your liver enzyme values monitored, as they can be affected by Niacin use.

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