Commercial almond milk contains trace amounts of cyanide-related compounds, but the levels are so low they pose no realistic health risk. The almonds used in commercial production are sweet almonds, which contain roughly 400 times less of the cyanide-producing compound amygdalin than bitter almonds. Pasteurization and other processing steps reduce those already-tiny amounts even further.
Why Almonds Contain a Cyanide Compound
Almonds naturally contain amygdalin, a compound classified as a cyanogenic glycoside. When amygdalin comes into contact with certain enzymes (either in the almond itself or in your digestive tract), it breaks down in two steps: first into an unstable intermediate compound, then into benzaldehyde (which gives almonds their distinctive flavor) and hydrogen cyanide. Hydrogen cyanide is the toxic part of this equation. It works by blocking cells from using oxygen, which is why large doses can be dangerous.
The critical distinction is between sweet almonds and bitter almonds. Sweet almonds, the type sold in grocery stores and used in almond milk, contain between 0.7 and 350 milligrams of amygdalin per kilogram. Bitter almonds contain 15,000 to 50,000 milligrams per kilogram. That enormous gap is why bitter almonds are not sold raw for direct consumption in most countries, while sweet almonds are eaten freely by the handful.
What Happens During Processing
Commercial almond milk goes through several steps that dramatically reduce whatever small amount of amygdalin the sweet almonds started with. Soaking, grinding, and straining all pull water-soluble compounds like amygdalin out of the almond solids. If enzymes do break amygdalin down during this process, the hydrogen cyanide produced is a gas that escapes into the air rather than staying trapped in the liquid.
Pasteurization, the heat treatment used on virtually all store-bought almond milk, delivers the final blow. Heat deactivates the enzymes responsible for converting amygdalin into cyanide in the first place. A study measuring cyanide levels in smoothies found that drinks made with pasteurized almond milk contained negligible cyanide, topping out at just 9.6 micrograms per liter. Smoothies made with unpasteurized almond milk measured higher, around 41 micrograms per liter, but even that level is far below any toxicity concern.
How Those Levels Compare to a Dangerous Dose
The lowest fatal dose of ingested cyanide for a human is estimated at 0.52 milligrams per kilogram of body weight. For a 70-kilogram (154-pound) adult, that translates to roughly 36 milligrams in a single exposure. Pasteurized almond milk measured at 9.6 micrograms per liter contains about 0.0096 milligrams per liter. You would need to drink thousands of liters in a single sitting to approach a dangerous dose, something that is physically impossible.
To put this in broader context, many common foods contain comparable or higher levels of cyanide-producing compounds. Apple seeds, cherry pits, peach pits, and plum seeds all contain amygdalin. Raw flax seeds, a popular smoothie add-in, contributed far more cyanide to tested beverages than almond milk did. Smoothies containing raw flax seeds measured between 134 and 341 micrograms per liter, orders of magnitude higher than the almond milk contribution alone.
Sweet Almonds vs. Bitter Almonds
Most of the alarming information about almonds and cyanide online refers to bitter almonds, which are a different variety than what you eat or drink. Bitter almonds get their intensely sharp flavor precisely because they contain so much amygdalin. They’re used in small quantities as a flavoring agent (amaretto, marzipan) but are typically processed with heat to neutralize cyanide before being added to food products.
Sweet almonds, by comparison, are the variety grown for snacking and for making almond milk, almond butter, and almond flour. Their amygdalin content is so low that even eating them raw and unprocessed presents no cyanide concern. The FDA lists amygdalin among natural toxins found in certain seeds and pits but notes that problems arise from consuming “a large amount” of seeds or pits, referring primarily to stone fruit pits and bitter almonds rather than to sweet almonds or products made from them.
Is Homemade Almond Milk Riskier?
Homemade almond milk skips pasteurization, which means the enzymes that convert amygdalin to cyanide remain active. The unpasteurized almond milk tested in research showed higher cyanide levels than pasteurized versions. That said, 41 micrograms per liter is still an extraordinarily small amount, thousands of times below a harmful dose. The soaking and straining steps you’d use at home still remove a significant portion of amygdalin from the final product.
If you make almond milk at home and want to minimize amygdalin further, blanching the almonds in boiling water before blending helps. This brief heat exposure both loosens the skins and deactivates some of the enzymes involved in cyanide release. It’s the same principle commercial producers have relied on for centuries to reduce cyanide-producing compounds in plant-based foods.
The Bottom Line on Safety
Almond milk does contain measurable traces of cyanide-related compounds, but “measurable” and “dangerous” are very different things. The sweet almonds used in commercial production start with minimal amygdalin, and pasteurization reduces what little remains to negligible levels. The cyanide detected in pasteurized almond milk is thousands of times below any threshold associated with symptoms, let alone toxicity. By the same logic that makes eating an apple safe despite its seeds containing amygdalin, drinking almond milk is not a cyanide risk.