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What does vitamin B3 do for skin health?
Vitamin A, B and C are the building blocks of any skincare routine. Vitamin B3 is known as niacinamide or nicotinamide. This water soluble vitamin has the following properties

Antiinflammatory, reducing UV induced proinflammatory cytokines.
Reduces UV induced immune suppression.
Enhances repair of UV induced DNA damage.
Replenishes cellular energy due to UV radiation.
Broad base of nose means nose shaping with dermal fillers.
Lip ratio different in Asian & ethnics, means different volume of upper vs lower lip (1 to 1 ratio)
Vitamin B3 also reduces water loss, enhancing skin barrier function. B3 also reduces pigmentation as it downregulates transfer of pigment to skin cells.
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Does niacinamide reduce skin cancer risks?
Yes. Niacinamide 500 mg twice a day can reduce the risks of nonmelanoma skin cancers by 23%. To be specific

BCCs, superficial BCCs showed a reduction of 20% at 12 months.
SCCs, both superficial & deep, were reduced by 30%.
Supplementation works best in higher risk individuals– those who have had multiple skin cancers &/or immunosuppressed (transplant patients).