I misstated. They contain a formaldahyde "releaser". Ice on Ice does not have the ingredients on the bottle, but when I contacted them, they sent the info immediately and I really appreciated that. The other is EQyss Avocado Mist. Both list DMDM Hydantoin as an ingredient. Wiki shows the following, so I am trying to find out if I should be concerned.
DMDM hydantoin is an
antimicrobial formaldehyde releaser preservative with the trade name Glydant. DMDM hydantoin is an
organic compound belonging to a class of compounds known as
hydantoins. It is used in the
cosmetics industry and found in products like
shampoos,
hair conditioners, hair gels and skin care products.
[1][2]
DMDM hydantoin works as a preservative because the released
formaldehyde makes the environment less favorable to the
microorganisms.