Butterfly pea flower is a vibrant blue flower used across Southeast Asia as a tea, food coloring, and traditional remedy. Its most well-studied benefits center on its unusually potent antioxidant content, but it also shows promise for supporting healthy cholesterol levels, protecting brain cells, and fighting certain bacteria. Here’s what the evidence actually supports.
Why the Blue Color Matters
The deep blue of butterfly pea flower isn’t just visually striking. It comes from a class of antioxidants called anthocyanins, the same family of compounds found in blueberries and red cabbage. But butterfly pea flower contains a particularly powerful subtype: polyacylated anthocyanins called ternatins. Researchers have identified 15 distinct ternatins so far, all built on a base molecule called delphinidin. This polyacylated structure makes ternatins more stable than the anthocyanins in most fruits and vegetables, meaning they hold up better during digestion and in hot water, which is partly why the flower has been brewed as tea for centuries.
These antioxidants neutralize free radicals, the unstable molecules that damage cells and contribute to chronic disease and aging. The high concentration of delphinidin-based compounds is what drives most of the health benefits researchers have explored.
Cholesterol and Metabolic Health
Some of the strongest research on butterfly pea flower involves its effects on fat metabolism. In a study on mice fed a high-fat, high-fructose diet for 16 weeks, those given an aqueous extract of the blue petals in their drinking water showed significant improvements across several metabolic markers. The extract reduced levels of free fatty acids, LDL (“bad”) cholesterol, and leptin, a hormone linked to appetite regulation. At the same time, it increased HDL (“good”) cholesterol, essentially helping the body move cholesterol out of the bloodstream more efficiently.
The extract also reduced signs of fatty liver damage and improved insulin sensitivity. These results suggest butterfly pea flower may help protect against the cluster of problems that come with a high-sugar, high-fat diet: weight gain, inflammation, and insulin resistance. That said, these findings come from animal studies with concentrated extracts, so the effects from casually drinking the tea will be milder.
Brain and Memory Support
Traditional medicine systems in India and Southeast Asia have long used butterfly pea for cognitive support, and modern research is beginning to explain why. A study on rats with impaired blood flow to the brain found that butterfly pea root extract restored memory function at doses of 200 and 300 mg/kg. The higher dose also blocked an enzyme that breaks down acetylcholine, a neurotransmitter essential for learning and memory. This is the same basic mechanism used by several prescription medications for dementia.
The extract also reduced physical damage to neurons in the hippocampus, the brain region most critical for forming new memories. Researchers concluded it has therapeutic potential for cognitive decline related to vascular dementia, a type caused by reduced blood flow to the brain. Worth noting: this research used root extract, not flower tea, and the doses were much higher than what you’d get from a cup of tea. Still, the cognitive-protective properties of the plant are real and well-documented in animal models.
Anti-Inflammatory and Antimicrobial Properties
Beyond anthocyanins, butterfly pea contains cyclotides, ultra-stable ring-shaped peptides found in all parts of the plant. These molecules are unusually tough, resisting heat, acid, and enzymatic breakdown. Cyclotides from butterfly pea have demonstrated antimicrobial activity against Gram-negative bacteria, a category that includes common pathogens like E. coli and Salmonella.
The cyclotides also appear to have immunomodulating properties, meaning they can help regulate immune responses rather than simply boosting or suppressing them. Researchers believe the anti-inflammatory effects of butterfly pea likely come from cyclotides and delphinidin-based anthocyanins working together. The animal study on high-fat diets confirmed this, showing reduced markers of inflammation and oxidative stress in treated mice.
The Color-Changing Tea Trick
One of the most popular reasons people seek out butterfly pea flower is its dramatic color shift. Brewed as tea, it produces a vivid blue liquid. Add something acidic like lemon juice (around pH 2), and it turns purple or magenta. In a basic (alkaline) solution, it shifts toward yellow. This happens because delphinidin changes its molecular structure at different pH levels, absorbing different wavelengths of light.
This makes butterfly pea flower a favorite for cocktails, mocktails, and visually striking beverages. It’s essentially a natural pH indicator you can drink. The flower itself has almost no flavor, just a mild earthy note, so it works as a color additive without changing the taste of whatever you’re making. You can also use it to naturally tint rice, desserts, and dumplings, which is common in Thai and Malaysian cooking.
How Much to Use
A typical recommendation is 1 to 2 cups of butterfly pea flower tea per day, made with about 5 to 10 fresh flowers or 1 to 2 grams of dried flowers per cup. Steep in hot water for 5 to 10 minutes. The longer you steep, the deeper the blue and the more compounds you extract. You can drink it hot or iced, plain or with honey and lemon.
Concentrated extracts and supplements exist, but dosing for those is less standardized. If you’re using it purely as a food coloring, the amounts are small enough that safety isn’t a concern for most people.
Who Should Avoid It
Butterfly pea flower is safe for most adults in moderate amounts, but several groups should steer clear. Pregnant women should avoid it because compounds in the flower can stimulate uterine contractions. People with low blood pressure may experience dizziness, nausea, or lightheadedness, since the flower can lower blood pressure further. If you take blood-thinning medications, butterfly pea flower may interfere because it limits platelet clumping. Women who are menstruating or anyone about to undergo surgery should also avoid it, as it can increase blood circulation.
The seeds of the plant are a separate concern entirely. Unlike the petals, the seeds can cause nausea, vomiting, and diarrhea, especially in children. Stick to the flowers for tea and culinary use.