NAD+

Boosts Collagen Production: NAD+ activates proteins called sirtuins (specifically SIRT1). These act as cellular managers that stimulate collagen production and block the enzymes responsible for breaking down collagen as you age
Fuels DNA Repair: Environmental stressors like UV radiation and pollution damage skin cells. NAD+ powers the repair enzymes (PARPs) that fix this damage, preventing the premature sagging and thinning known as photoageing
Energises Skin Cells: Healthy skin cell turnover requires a massive amount of cellular energy (ATP). NAD+ keeps the cell's powerhouses (mitochondria) functioning, ensuring your skin has the energy to renew itself and maintain a strong moisture barrier.