How elder tissue can release cyanide
Elder branches do not simply contain free cyanide. Some elder tissues contain cyanogenic glycosides—plant compounds that can release hydrogen cyanide when they are broken down. Chewing or crushing the tissue can bring these compounds into contact with enzymes that help split them apart, potentially producing the toxin.
The amount can vary with the plant part and its condition. Leaves and stems are not ingredients to eat, and raw or unripe elderberries can also cause illness. The concern is ingestion, not merely having a branch nearby.
Why cooking matters
People commonly cook elderberries into syrup or other foods. Heat and processing can reduce the compounds that cause trouble, which is why cooked berries are treated differently from raw plant material. That does not make every elder product automatically safe: preparation matters, and stems or leaves should be kept out of food.
The practical distinction is simple: elder is not uniformly edible from root to berry. A branch that looks harmless can carry plant chemicals that become hazardous when eaten, while properly prepared berries are used as food.
