How often should I incorporate The Ordinary Glycolic Acid Toner into my skincare regimen to achieve optimal results? Is it advisable to use it on a daily basis, or would a less frequent application yield better outcomes for sensitive skin types? Moreover, could the frequency of use vary based on individual skin concerns, such as acne, hyperpigmentation, or signs of aging? What are the potential risks of overusing this particular toner, and how might it affect the skin’s natural barrier function? Additionally, are there specific indications that would suggest an adjustment in usage frequency, perhaps in relation to seasonal changes or fluctuations in the skin’s condition? How should other products within my skincare routine, such as moisturizers and serums, be harmonized with the application of this glycolic acid toner? In what ways might one monitor for adverse reactions or improvements, and how should these assessments influence ongoing usage decisions?