Niacinamide is a form of vitamin B3 or niacin, an essential nutrient that provides many health benefits to your skin, kidneys, heart, nerves, gut, brain, and other body organs.  

The synthetic form of niacinamide is used in making moisturizers, serums, and other skin care products.

Suitable dosage form: Softgel，Tablets，Capsules, Chewable Tablets，Liquid Drops，Powder，Extended-Release Tablets.

Dosage information :The recommended daily amount is 250–300 mg per da.

Reference Link:https://www.healthline.com/nutrition/nicotinamide-riboside#dosage