Methylguanidine (MG) is a guanidine compound deriving from protein catabolism. It is also a product of putrefaction.

BFMO (biogenic Fe-Mn oxides, defined as a mixture of biogenic Mn oxide (BMO) and Fe oxide) could eliminate or decrease Fe(II), Mn(II), and As(III&V) species simultaneously.

Prenol is found in blackcurrant. Prenol is a constituent of ylang-ylang and hop oils. Prenol is found in orange peel oil and various fruits e.g. orange lemon lime grape pineapple purple passion fruit loganberry etc. Prenol is a flavouring ingredient