I wouldn't drink Rodinal, but the developing agent in it, which I believe is p-aminophenol, can be made from acetaminophen, commonly sold in the US as Tylenol. Can't imagine it would be that toxic to brew yourself, probably no more toxic than common household chemicals. Jnanian makes his own developer from coffee, washing soda, and vitamin C, all common things that can be found in a home.
I quote myself to note that I finally finally finished the bottle tonight ... and it was dead as a doornail, not even a whisper of an edge code on my Acros, less than a month after I last used it when it produced perfectly well developed negatives.
So, in my house at least, APH09 lasts a quite long time, but not indefinitely, and then dies suddenly
The eBay kit, I imagine, is being produced and sold by KennyE; he ought to be careful, calling it Rodinal and advertising it with a picture of a Rodinal bottle ...
Another Rodinal pop-up. Thread put on ignore list. No contempt towards Rodinal fanboys intended. Good luck with that. If that stuff be your preference and they still make it these days, I'm glad for you. I'll use my Microdol and if I want Rodinal effects, I'll just sprinkle salt and pepper on my negative before enlarging it.:whistling: