Cactus milk is a white sap that is secreted when some species of cactus are injured. The milky substance is also called latex and it helps the plant heal from physical damage. Overwatering can also cause the plant to release a sap, but it can also be a poisonous secretion meant to defend the plant.
Keeping this in view, is cactus milk edible?
The milky sap of these plants can burn the skin and mucous membranes and can cause permanent blindness if it gets in your eyes. Definitely don’t try to eat those.