Retin-A contains tretinoin and is available in cream or gel forms. The gel is available in 0.025% or 0.01% strengths, but contains 90% alcohol, which significantly increases the potential for irritation. The cream version comes in three strengths: 0.1%, 0.05%, and 0.025%, and is formulated in a bland moisturizing base. Costs for the various formats and strengths vary, but are similar to the prices for Renova and Retin-A Micro. For more information about tretinoin, the active ingredient in every form of Retin-A, please click on Retinoids from the Master Brand List.