diff --git a/code/controllers/subsystems/chemistry.dm b/code/controllers/subsystems/chemistry.dm
index df2b23bf0a4..80dab741214 100644
--- a/code/controllers/subsystems/chemistry.dm
+++ b/code/controllers/subsystems/chemistry.dm
@@ -63,6 +63,9 @@ SUBSYSTEM_DEF(chemistry)
 					LAZYINITLIST(chemical_reactions_by_product[D.result])
 					chemical_reactions_by_product[D.result] |= D // for reverse lookup
 
+			// we want to maintain original chemistry behavior, but still document all reactions above, only add to this list with the first reagent
+			if(i > 1)
+				continue
 			LAZYINITLIST(add_to[reagent_id])
 			add_to[reagent_id] |= D