Bad for your liver if you take too much flush-free. I don't think you can get enough flush-free to change blood cholesterol and not risk a different health problem. There will be plenty of literature about this online. I am not any expert.
Also read up on Niaspan which is a prescription niacin drug with no flushing, but also no, uh, nicotinamide, IIRC.
Niacin did move the needle by 20+ points for me in my one person unblinded no placebo controlled anecdotal trial, so anything I say may not apply to you. :-)
How much B3 (Niacin) should a 200lb male take? Just hypothetically; in Minecraft.
If you start losing hearts you should back off a bit.
Thank you.
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