I've read on this site that oral isotretinoin is contraindicated up to a year prior to IPL because it is photo-sensitizing. Is there a similar contraindication prior to IPL for the various topical retinoids such as: retinal, retinyl acetate, retinyl palmitate, retinol, retinoic acid? What about topical beta carotene? These various forms of Vit A are often included in many skin care products.