NRG is a powdered supplement made by Herbalife, officially called N-R-G Nature’s Raw Guarana Instant Tea Mix. It’s one of several Herbalife products commonly mixed into “loaded teas,” the colorful, high-energy drinks sold at nutrition clubs and home-based shops across the country. NRG’s main job in a loaded tea is to add a boost of guarana-based caffeine alongside the other energy and supplement ingredients in the drink.
What’s Actually in NRG
A single serving of NRG is half a teaspoon (about 1 gram) of powder. According to the product’s supplement label in the NIH Dietary Supplement Label Database, each serving contains 250 mg of orange pekoe extract (a type of black tea), 120 mg of guarana seed extract, and 40 mg of caffeine sourced from a combination of the guarana, natural caffeine powder, and the orange pekoe. The remaining ingredients are fillers and flavorings: maltodextrin, citric acid, natural lemon peel flavor, modified food starch, vitamin C, and tocopherols (a form of vitamin E used as a preservative).
Nutritionally, NRG is essentially zero-calorie. It contains no sugar, no fat, no protein, and no carbohydrates in a prepared serving. That’s one reason it fits neatly into loaded tea recipes, which are often marketed as low-calorie energy drinks.
Why Guarana Instead of Regular Caffeine
Guarana is a plant native to the Amazon basin, and its seeds contain caffeine along with other naturally occurring compounds. What makes it interesting is that the caffeine in guarana may not tell the whole story of its effects. In a series of studies, researchers found that a 75 mg dose of guarana extract, which contained only about 9 mg of caffeine (a level generally considered too low to do anything on its own), still improved memory performance, attention speed, and subjective feelings of alertness in healthy young adults. Performance didn’t increase with higher doses either, suggesting that guarana’s effects aren’t purely about its caffeine content. Other compounds in the seed likely play a role.
A separate double-blind, placebo-controlled study of 129 young adults found that a supplement containing guarana improved both the speed and accuracy of a rapid visual processing task over a 60-minute testing period, and it reduced the mental fatigue that normally builds during sustained concentration. These findings support the general claim that guarana can sharpen focus, though the effects are modest and studied in controlled settings, not in the context of a loaded tea.
How NRG Fits Into a Loaded Tea
A typical loaded tea isn’t just NRG. It’s a combination of several Herbalife products mixed together: usually an Herbal Tea Concentrate (which adds another 85 mg of caffeine per serving), a flavored Liftoff tablet, Aloe Vera Concentrate, and sometimes collagen or other add-ins. NRG contributes 40 mg of caffeine to this mix, but the total caffeine in a single loaded tea often lands somewhere between 175 and 275 mg depending on the recipe, roughly the equivalent of two to three cups of coffee.
The appeal is the combination: energy from caffeine, added vitamins and herbal ingredients, bright colors from the Liftoff tablets, and very few calories. NRG specifically adds the guarana element, which sellers often describe as providing a “cleaner” or more sustained energy compared to coffee. While guarana does appear to have cognitive benefits beyond its caffeine alone, the science hasn’t confirmed that it produces a meaningfully different energy curve than other caffeine sources when consumed in a mixed drink like this.
Caffeine Risks Worth Knowing
Forty milligrams of caffeine from NRG alone is mild, less than half a cup of coffee. But NRG is never consumed alone in a loaded tea. The combined caffeine from all the ingredients can add up quickly, especially if you’re drinking loaded teas daily or having more than one.
High caffeine intake from energy-style drinks is linked to increased blood pressure, changes in heart rate, anxiety, insomnia, tremors, and in serious cases, cardiac arrhythmias. When caffeine is consumed alongside taurine, which is present in some loaded tea formulations, the effects on heart rate and blood pressure can be more pronounced than either ingredient alone. Caffeine can also cause electrolyte imbalances, particularly drops in calcium and potassium levels, which may be a concern for anyone with an underlying heart condition.
Children and adolescents are especially vulnerable. The recommended caffeine ceiling for adolescents is 100 mg per day, and for younger children it’s even lower (2.5 to 6 mg per kilogram of body weight). A single loaded tea can easily exceed those limits in one serving. Parents should also be aware that caffeine from loaded teas can interact with prescription stimulant medications used to treat ADHD.
NRG Is a Supplement, Not an Approved Product
NRG is classified as a dietary supplement under federal law. That means the FDA does not review or approve it for safety or effectiveness before it reaches consumers. Manufacturers are responsible for ensuring their own products meet safety standards, and the label is required to carry a disclaimer stating the product is not intended to diagnose, treat, cure, or prevent any disease. The health claims you hear at nutrition clubs, like fat burning, metabolism boosting, or detoxing, are marketing language, not verified medical claims.
This regulatory gap matters because loaded teas are often sold by independent distributors who may not fully understand the ingredient profiles of what they’re mixing. NRG on its own is a relatively low-caffeine, low-risk product. But stacked with other supplements in a single drink and consumed regularly, the cumulative intake of caffeine and herbal compounds deserves more attention than most consumers give it.