When contemplating the optimal timing for the application of glycolic acid, one might wonder: Should I use glycolic acid in the morning or at night? This inquiry delves into the intricate dynamics of skincare routines and the specific properties of this renowned alpha hydroxy acid. Glycolic acid is celebrated for its exfoliating prowess and ability to enhance skin texture, yet its interaction with sunlight raises questions about potential phototoxicity. Could applying it in the morning expose the skin to unfavorable reactions, given its exfoliating nature? Conversely, if used at night, might it allow for a more robust recovery process while minimizing exposure to UV rays during the daylight hours? Furthermore, could the choice between morning and night application influence the efficacy of accompanying products, such as moisturizers and sunscreens? With these multifaceted considerations, what guidance should one follow to ensure optimal benefits while safeguarding skin health?