Potato: Potatoes are a treasure house of vitamins, B-Complex, potassium, magnesium, zinc and phosphorus. It has inbuilt skin lightning properties. Vitamin B in potatoes is known for cell renewal, especially niacinamide, a derivative of vitamin B complex. It is a vital skin lightning agent. Procedure: Cut potatoes into slices. Rub the slice in circular motion on your skin for 10 minutes. If you feel the potato slice is dry, use another slice.