I bought this but used a different form of Niacin in the end. This is the flush version, nicotinic acid.
Vitamin B3 Nicotinamide, Niacinamide 500mg - 90 Vegan Niacin B3 Capsules Flush Free, for Skin, Energy Yielding Metabolism, Tiredness & Fatigue, One A Day, 3 Months Supply - Made in The UK By YrHealth
Vitamin B3 Nicotinamide, Niacinamide 500mg - 90 Vegan Niacin B3 Capsules Flush