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Exception: Some vitamin C derivatives (like magnesium ascorbyl phosphate) are formulated to be more pH-stable and may be more compatible with retinol, but the AM/PM split remains the safest and most effective approach
2004;50(Suppl):P175
10.1039/D0FO02375B 85 KongX.-J.LiuJ.LiuK.KohM.ShermanH.LiuS.et al (2021)

The short answer: there is promising but limited evidence