A process for producing PU foams can be performed by reacting at least one polyol component, which contains a recycled polyol, and at least one isocyanate component in the presence of one or more catalysts that catalyze the isocyanate-polyol and/or isocyanate-water and/or isocyanate trimerization reactions. The process also has at least one foam stabilizer and optionally one or more chemical or physical blowing agents. The employed recycled polyol has a total concentration of antioxidants of formula 3a and/or formula 1d of 0.001% to 10% by weight, preferably 0.002% to 8% by weight, further preferably 0.005% to 7.5% by weight, and particularly preferably 0.01% to 5% by weight, based on the total recycled polyol.