@haidut My girlfriend is going to try energin applied topically at bight on a brown aging spot on her forehead. She also uses progesterone topically dissolved in oil in the last two weeks of her cycle, do you think it can mix? Or maybe progesterone in the morning and energin in the evening?
I saw that Ray Peat mentioned that alcohol may help getting rid of lipofuscin, so it may be good that is is in energin.
I don't think there is an issue with mixing other that the water/ethanol mixture of Energin will probably not mix well with the lipophillic progesterone. So, probably best to apply at different times.