LONGECITY

I wonder what a better dosage is for long-term supplementation: 500mg or 1g? Some sources claim 500mg is too low. Some sites (like the niacin page of examine.com) claim one has to take at least 1 gram daily to notice benefits. But I´m not sure if they considered young people like myself when making that conclusion. I´m also on a budget, so I would prefer 500mg, but only if it does something off course. I´m 24 years old so perhaps I need less as well than others. 

Then there´s also a concern one needs to supplement acute release, rather than extended or sustained release, due to hightened diabetes risk. But perhaps biting/chewing an extended/sustained release pill causes it to be exact like an acute release?

I had to repost this, as I posted in the wrong forum before.