The 5% Niacinamide Body Serum and Retinol Body Treatment are both great options and bring overlapping and unique benefits to the table. The 5% Niacinamide Body Serum is our best option for uneven skin tone on the body while the Retinol Body Treatment is a superstar for multiple signs of aging, wrinkles and loss of firmness. Using these two products with one of our body exfoliants maximizes results. You can layer them once daily or alternate days, using retinol one day, niacinamide the next and one of our body exfoliants daily, depending on how your skin responds.