I deleted my former comment, because I readhed 95 in Alchemy today (Yay!) and do not need these anymore.
I was quite successful with panacea and platinum nuggets. You can try these recipes with ~93 without fear of too great a loss. I think I did lose only one philosopher's stone. And platinum nuggets sell quite well, that is if you can get the platinum leaves. But panacea will last until 98 for me. Here's hoping I'll finish Alchemy after all.