Butterfly pea flower is not poisonous to humans when consumed as a tea or food ingredient. The vibrant blue petals have been used in Southeast Asian cooking and traditional medicine for centuries, and they are widely sold as dried flowers for tea. However, not every part of the plant is equally safe, and there are a few situations where caution makes sense.
The Flowers Are Safe to Eat and Drink
The petals of the butterfly pea plant (Clitoria ternatea) are the part people use in tea, cocktails, rice dishes, and natural food coloring. Their striking blue color comes from anthocyanins, the same group of pigments found in blueberries and red cabbage. These compounds are well-studied antioxidants with no known toxicity at normal dietary levels. China’s proposed daily intake guideline for anthocyanins is 50 mg, and a single glass of butterfly pea tea brewed for 30 minutes contains roughly 10% of that amount, so casual drinking stays well within safe territory.
Dried butterfly pea flowers are approved as a food ingredient in many countries and are commercially available worldwide. There is no established toxic dose for the flower petals in humans.
Seeds and Roots Are a Different Story
While the petals are safe, the seeds and roots of the butterfly pea plant carry more biological activity and should not be treated as food. Root extracts have shown significant toxicity to larvae and worms in laboratory studies, causing paralysis and death at moderate concentrations. This isn’t surprising: the entire plant contains cyclotides, a class of extremely stable peptides that act as natural insecticides by punching holes in cell membranes.
These cyclotides are potent enough that an Australian company developed a commercial eco-friendly pesticide (Sero-X) from butterfly pea plant extracts. The cyclotides are concentrated more heavily in the shoots and roots than in the flowers. Notably, the pesticide product was tested and found non-toxic to rodents and bee pollinators, which suggests that cyclotides are far more dangerous to insects than to mammals. Still, the seeds and roots are not used in food preparation, and there’s no reason to start.
Reported Side Effects
Some people report nausea, stomach pain, or diarrhea after drinking butterfly pea tea, but no clinical research has confirmed these effects. They may reflect individual sensitivity, brewing the tea extremely strong, or consuming other parts of the plant by mistake. For most people, a cup or two of butterfly pea flower tea causes no digestive issues at all.
Allergic reactions are possible with any plant product, though documented cases specific to butterfly pea flower are rare. If you have known allergies to legumes (butterfly pea is in the same family as peas and beans), it’s worth being cautious the first time you try it.
Pregnancy and Other Precautions
Butterfly pea flower has a long history in traditional medicine systems, where it has sometimes been used to promote menstruation. Because of this traditional use, many sources recommend that pregnant and breastfeeding women avoid it. No clinical trials have tested its safety during pregnancy, so the caution is based on the theoretical risk rather than documented harm. Cyclotides in the plant have also been reported to have immune-modulating properties, which is another reason people with autoimmune conditions or those on immunosuppressive medications sometimes choose to skip it.
If you’re taking medication for blood clotting or blood pressure, keep in mind that some animal studies suggest butterfly pea flower extracts could interact with these pathways. The effects seen in animal research don’t always translate to humans drinking a mild tea, but it’s worth noting if you consume it regularly in large amounts.
How to Use It Safely
Stick to the dried flower petals, which is what you’ll find sold as “butterfly pea flower tea” from reputable vendors. Brew them as you would any herbal tea: a small handful of dried flowers steeped in hot water for 5 to 15 minutes. The tea itself is mild, slightly earthy, and essentially flavorless, which is why it’s often paired with lemon, honey, or lemongrass. Adding an acidic ingredient like lemon juice turns the blue liquid purple, a color-changing trick that has made it popular in cocktails and lattes.
Avoid harvesting and consuming seeds, pods, or roots from the plant. If you grow butterfly pea vines in your garden, the flowers are fine to pick and use fresh or dried, but treat the rest of the plant as ornamental. For children and pets, the flowers pose no known danger, though the seeds could be a concern if eaten in quantity given their higher cyclotide content.