What is Niacinamide?

 Niacinamide, also known as nicotinamide, is an active form of Vitamin B3 that is naturally found in many kinds of plants and foods such as meat, nuts, grains, and cereal.
It performs the essential biochemical functions of niacin and prevents serious problems caused by its deficiency.
It is stable and water-soluble so that it can be easily dissolved in water and well-absorbed into your body.

 As for the effectiveness of Niacinamide, it is good for anti-aging and moisturizing. It has anti-inflammatory actions which help alleviate swelling and redness of the skin, and it also regulates sebum production to improve acne.
It may be used to treat certain skin conditions such as rosacea or bullous diseases. It also suppresses the pigmentation by decreasing melanin formation which leads to long-lasting pigmentation. Additionally, it recovers a balance of skin tone and can brighten your skin by decreasing melanin production

 If you are looking for a potent version of niacinamide, 5% or above of niacinamide would be perfect!
PURITO Galacto Niacin 97 Power Essence has a maximum 5% of Niacinamide allowed by the Ministry of Food and Drug Safety along with 92% of naturally fermented galactomyces filtrate that suppresses the melanogenesis and helps whiten your skin. It brings out the maximum whitening and skin-firming effects.

 (Sources)

http://www.acnesupport.org.uk/treatment/niacinamid/

https://www.cancer.gov/publications/dictionaries/cancer-terms/def/niacinamide

https://ww5.komen.org/BreastCancer/Niacinamide/