Green tea and coffee are two popular beverages that can increase alertness and are associated with a range of health benefits, including supporting heart health. However, the best one for boosting energy and protecting your cardiovascular system depends on your goals and individual needs.

Whether you get better energy from green tea or coffee depends on your goals. While caffeine content varies, coffee generally has more per serving—about 80 to 100 milligrams (mg) per 8 ounces compared with 25 to 50 mg in the same amount of green tea. “The higher concentration of caffeine in coffee gives people a quicker and bigger boost of energy,” said Natasha Bhuyan, MD, a family physician and national medical director at One Medical.

Green tea, on the other hand, may not provide an immediate jolt, but it contains compounds that support more sustained alertness. “Green tea contains L-theanine, which is an amino acid that can promote calm alertness and reduce jitteriness,” Alison Swiggard, MS, RDN, LD, a registered dietitian with CV Wellbeing, told Health.

Both coffee and green tea may support heart health, said Michelle Routhenstein, MS, RD, CDCES, CDN, a preventive cardiology dietitian at Entirely Nourished. This is likely due to green tea’s catechins and coffee’s chlorogenic acids.

“Green tea may offer a slight benefit for LDL oxidation and blood vessel function, while coffee is consistently associated with lower all-cause and cardiovascular mortality,” she said. According to Routhenstein, population studies have linked both beverages to reduced risks of heart disease and stroke.

However, acute blood pressure spikes are more pronounced with coffee, Routhenstein said, so those with high blood pressure or arrhythmias may benefit from green tea or decaffeinated options.

Certain factors can influence how each beverage affects your body.

When it comes to energy, “individual tolerance, sleep quality, intake of food, and anxiety levels matter more than the beverage itself,” Swiggered explained. Another factor is how quickly you metabolize caffeine, Routhenstein said. “Fast metabolizers may experience a milder, shorter stimulant effect from coffee, while slow metabolizers may feel jittery or notice longer-lasting effects.”

For heart health, preparation matters. If you add sugar or cream to coffee but drink green tea plain, green tea may be the healthier option, Routhenstein noted.

It’s also important to consider digestive sensitivity. For people with IBS or sensitive digestion, coffee may worsen symptoms, Swiggard said. Because caffeine can act as a mild diuretic and bladder irritant, it may increase urinary urgency and frequency in those who are sensitive or have conditions like pelvic floor dysfunction. “Because green tea has less caffeine, it’s often gentler on the bladder,” she added.

Ultimately, the ideal beverage depends on your individual physiology. “The ‘better’ choice is the one you feel best drinking without unwanted side effects,” Swiggard said.