The skin requires a healthy dose of antioxidants every day to prevent new damage and reverse prior skin damage. Layer your antioxidant serum under your SPF for added sun protection.
Retinol helps increase skin cell turnover which in turn encourages collagen production. The end result is smoother, brighter skin with less breakouts and clogged pores.
Everyone needs sun protection, end of story. If you don’t spend much time in the sun, an SPF 15 in your daily lotion is fine, if you get more exposure bump it up to SPF 30.