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When taken by injection or intravenously, bioavailability is much better and most people can feel its effects straight away especially with intravenous NAD+ infusions. Meanwhile, Mandavias opinion is that there is not enough evidence to support the effectiveness of NAD intravenous injections, saying: There is currently a paucity of evidence to support NAD injections or intravenous infusions

doi:10.1007/8904_2016_531

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But concentrated solutions (10mg/ml or higher) should display obvious blue coloration