When you're low on energy, it's tempting to reach for the nearest can of soda or high-sugar energy drink. But more people are realizing that quick fixes come with a crash—and long-term consequences. That’s where functional energy drinks come in, especially those that use green tea as a clean, natural source of caffeine. Big Brands can help you manufacture your functional energy drink.

Not all caffeine is created equal—and today’s functional drinks are proving that you can get energy without compromising your health. Unlike traditional energy drinks that rely on synthetic caffeine and sugar spikes, functional beverages use cleaner, plant-based sources of caffeine that support focus, balance, and well-being.

Here are some of the most popular healthier caffeine sources in functional energy drink manufacturing:

Green Tea

One of the most trusted natural energy boosters, green tea contains a moderate dose of caffeine (plus L-theanine), which promotes calm alertness without the crash. It’s the perfect combo for steady energy and mental clarity. Traditional energy drinks often rely on synthetic caffeine, excessive sugar, and artificial stimulants that spike your energy—then leave you crashing. Green tea, on the other hand, offers a gentler, more balanced boost thanks to its naturally occurring L-theanine, an amino acid known to promote calm focus and reduce jitteriness.

Guarana

Sourced from a plant native to the Amazon, guarana naturally contains caffeine and is often used in functional drinks for longer-lasting stimulation. It releases more slowly than synthetic caffeine, helping prevent spikes and crashes.

Yerba Mate

Used traditionally in South America, yerba mate is rich in antioxidants and provides a smooth, sustained lift in energy and mood. It’s often favored for its combination of alertness and focus.

Matcha

A powdered form of green tea, matcha delivers a more concentrated dose of caffeine and antioxidants. It’s prized for supporting both mental clarity and metabolic health.

Green Coffee Extract

These are made from unroasted coffee beans or the whole coffee fruit, offering milder caffeine plus natural antioxidants like chlorogenic acid, which may help with metabolism and inflammation.

We want to feature a new functional energy drink, IS-BE that goes beyond energy. They use functional ingredients and antioxidants that support the whole body with a curated list of functional, health-promoting ingredients:

Caffeine from organic green tea – for clean, sustained energy

 Vitamin C – to support immunity and cell repair

Magnesium + Zinc – essential minerals for focus, muscle recovery, and mood

Celtic Sea Salt + Potassium – natural electrolytes for hydration and balance

Organic flavors and clean ingredients – no junk, no fillers, no regrets

This functional energy drinks use organic green tea to deliver 100mg of clean caffeine—just enough to give you clarity and stamina without the crash. It’s energy that works with your body, not against it. IS-BE also has 3 tasty flavors - way to go IS-BE!!

Functional energy drinks that incorporate these natural, plant-based caffeine sources help you stay energized without overstimulating your nervous system. Whether you're sipping green tea–based ISBE, a yerba mate infusion, or a matcha tonic, you're choosing energy that supports—not sabotages—your body.

Ditch the Junk

Unlike conventional energy drinks that leave you wired and dehydrated, ISBE contains no artificial sweeteners, no high-fructose corn syrup, and no synthetic additives. Just real ingredients with real benefits.

Energy With Intention

Whether you’re heading into a workout, powering through meetings, or balancing work and family, ISBE offers functional energy that supports your lifestyle. It’s not just about keeping you awake—it’s about helping you thrive.

This isn’t just an energy drink. It’s a daily ritual of support, clarity, and care.

Big Brands can help you manufacture a functional energy drink.