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The 2004 Bissett study in International Journal of Cosmetic Science used twice-daily 5 percent niacinamide for 12 weeks in 50 women aged 40 to 60, documenting significant reductions in fine lines, hyperpigmentation spots, blotchiness, and yellowing [13]
doi:10.1111/jocd.14504 Gasteratos, K., K
Similarly, amino acid injections can offer long-term benefits such as improved muscle recovery, better nutrient absorption, and enhanced metabolic function
Moreover, some NAD + precursors have shown side effects, such as the use of NA at certain doses that might be limited due to skin flushing or induction of insulin resistance 332,333