NMN (unlike NR) increases insulin sensitivity in human by Dr David Sinclair #nmn #nr #drdavidsinclair #davidsinclair #insulinsensitivity #type2diabetes #prediabetes #bloodsugar #aging #hba1c #diabetes #type2diabetic #aginggracefully #lowerbloodsugar #agewell #lifespanclips #nmnsupplement #bestnmn2024 #solensis