Poppy milk refers to two very different things depending on context. In its botanical sense, it’s the white, sap-like fluid that oozes from a scored poppy seed pod, and it contains potent opioid compounds including morphine and codeine. In its culinary sense, it’s a plant-based drink made by soaking and blending poppy seeds with water, traditionally served during Lithuanian Christmas Eve celebrations. The two share a name but have almost nothing else in common.
The Botanical Meaning: Raw Poppy Latex
When a poppy seed pod (from the species Papaver somniferum) is cut or scratched while still on the plant, it releases a milky white fluid called latex. This substance is the raw material of opium. Once collected and sun-dried, it becomes what’s historically known as raw opium, the starting point for both pharmaceutical painkillers and illicitly produced heroin.
The latex contains five major alkaloids, with morphine and codeine being the most pharmacologically active. These compounds bind to opioid receptors in the brain, producing pain relief, euphoria, slowed breathing, and reduced gut motility. Their effects are comparable in strength and risk profile to prescription opioids like oxycodone and hydrocodone, including the potential for physical dependence.
In the United States, opium poppy latex and all its alkaloids are classified as Schedule II controlled substances under the Controlled Substances Act. Possessing or extracting the latex is illegal. Poppy seeds themselves are excluded from that classification, but seeds contaminated with opium alkaloids are not exempt, a legal distinction that matters more than it might seem.
The Culinary Meaning: Poppy Seed Milk
The other poppy milk is a simple, non-intoxicating drink. In Lithuanian tradition it’s called aguonpienis (literally “poppy milk”), and it’s a staple of the Kūčios table on Christmas Eve. The recipe calls for just a handful of ingredients: about half a cup of black poppy seeds, water, a teaspoon of honey, and an optional pinch of salt.
To make it, you soak the seeds overnight in hot (not boiling) water, drain and rinse them the next day, then blend them with fresh cold water in a food processor or smoothie maker. After straining the mixture through a fine sieve once or twice, you blend the liquid again with honey and salt. The result is a thin, nutty, slightly sweet plant milk with a gray-blue tint. Some modern versions add a drop of almond extract, vanilla, or green cardamom.
Traditionally, the grinding was done by hand with a pestle and mortar, and the liquid was strained through muslin cloth. The drink is similar in concept to other seed and nut milks, using the fat and protein in the seeds to create an emulsion.
Why the Confusion Matters
The two meanings create real confusion because even food-grade poppy seeds carry trace amounts of opioid alkaloids on their outer coating. These aren’t produced inside the seed itself. They’re residue from the latex that coated the pod’s interior during growth. Washed and processed seeds, the kind sold for baking, have most of this residue removed. Unwashed seeds can retain significantly more.
The European Food Safety Authority has set a safe daily intake limit for morphine and codeine from poppy seeds at 10 micrograms per kilogram of body weight. For a 70-kilogram (154-pound) person, that’s 700 micrograms total. Commercially processed poppy seeds used in baking and cooking generally fall well within this limit, but unwashed seeds sold online or in bulk can vary enormously in alkaloid content.
Some people deliberately brew unwashed poppy seeds into a tea for pain relief or recreational use, sometimes calling the result “poppy milk” or “poppy seed tea.” The DEA has specifically noted this practice, warning that the pharmacological and toxic effects mirror those of prescription opioids. Deaths have been reported from poppy seed tea brewed from high-alkaloid batches, because there’s no way to gauge potency from one bag to the next.
Poppy Seeds and Drug Testing
Eating poppy seed foods or drinking poppy seed milk can trigger a positive result on opioid drug tests. This problem became well-known enough that in 1998, the federal threshold for a positive urine test was raised from 300 nanograms per milliliter to 2,000 nanograms per milliliter, specifically to reduce false positives from poppy seed consumption. Even at that higher cutoff, research shows that eating enough poppy seeds can still push urine concentrations above the threshold. Opioid levels also tend to remain detectable in urine longer than in saliva after poppy seed ingestion.
If you have a drug test coming up, it’s worth avoiding poppy seed products for at least 48 to 72 hours beforehand. A single poppy seed bagel is unlikely to cause a problem at the current cutoff, but large servings of poppy seed cake, poppy seed milk, or any recipe using unwashed seeds could.
Culinary Poppy Milk vs. Poppy Seed Tea
The traditional Lithuanian drink and the opioid-containing tea are prepared differently and have different effects. Culinary poppy seed milk uses food-grade (washed) seeds, soaks them in water, and strains out the solids to produce a mild, nutty beverage. The alkaloid content in the finished drink is minimal.
Poppy seed tea made for its drug effects typically uses large quantities of unwashed seeds, sometimes boiled or steeped for extended periods to maximize alkaloid extraction. The resulting liquid can contain unpredictable and potentially dangerous levels of morphine and codeine. These are not the same drink, despite sometimes sharing a name. If you’re looking up recipes for the traditional holiday beverage, standard food-grade poppy seeds from a grocery store are what you want.