Niacinamide or Hyaluronic Acid repairs the damaged barrier
Label, ingredients, and bottle design may differ from images shown
(Source 2) "Interventions that increase NAD+, including supplementing with NAD+ directly, may slow the aging process." Reason #2 - Reduce Disease Risk Higher NAD+ levels from liposomal supplementation increase sirtuins
AHK-Cu is available in topical formulations such as serums
However, clinical trials in patients that were administered GDNF in different regions of the brain have shown mixed results and further research is needed [31, 125-127]
Because this falls outside approved use, anyone considering it should work with a qualified medical professional who can explain the regulatory status, limited evidence, and risks rather than relying on online protocols