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[3] [4] Premature greying can occur earlier and may occasionally be influenced by nutritional factors, though genetics remains the predominant determinant

Hair follicles are among the most metabolically active cells in the body, and their high cell turnover rate makes them sensitive to any nutritional imbalance

Institutional research settings that track NAD+ levels and methylnicotinamide excretion often find individual dose-response variability of 3040%, meaning the 'right' dose for one subject may be subtherapeutic or excessive for another

Store the unopened vial in a clean, dry place away from direct sunlight and temperature extremes