Best for Oily Skin: SkinMedica HA5 Hydra-Collagen Replenish + Restore Hydrator Our favorite collagen cream is the Olay Collagen Peptide Moisturizing Cream, which has a lightweight formula that hydrates the skin without leaving behind greasy, sticky residue. Some other helpful ingredients to look for in collagen creams include niacinamide, ceramides, and plant-based retinol alternatives, like bakuchiol. The most effective collagen-boosting skin-care products are formulated with peptides or reti...