Niacin is a water soluble B Vitamin & if you follow a standard American diet, you likely absorb enough daily through your food intake but if you follow a vegetarian or vegan diet, you may need to supplement your Niacin as the larger amounts are naturally found in poultry, beef, fish and other animal products.
Because Niacin is water soluble, it means that any excess consumed is excreted through your urine so maintaining a consistent daily intake is key to receive the full skin and hair benefits. The recommended daily intake for women is 14mg and 16mg for men.
Niacin can be applied topically in the form of Niacinamide which can protect skin from sunburn, maintain moisture balance, promote hair growth and thickening from an increase in blood flow to the follicle, and assist in oil production regulation.
Your body cannot produce Niacin on it's own and it's an important factor in cell metabolism. It also factors into cell signaling, creating and repairing DNA, and acts as a skin damage reducing antioxidant.
Studies have supported Niacin's powerful skin cancer preventing capabilities as well as its natural ability to protect skin cells.
My favorite supplement is the Nature's Bounty in 250mg.
Please consult with your doctor before adding a supplement to your diet.