Standard topical skincare items and nutritional supplements from Nu Skin are generally well-tolerated by most users, but potential side effects can include localized skin irritation, allergic reactions, contact dermatitis, or breakouts, particularly for individuals with sensitive skin or chemical sensitivities. Active anti-aging ingredients, exfoliating acids, and potent botanicals can occasionally cause redness, dryness, or stinging if overused or applied incorrectly. Additionally, dietary supplements may cause mild gastrointestinal discomfort in some individuals. Consumers are always advised to review ingredient labels and perform patch tests before starting new regimens.