Functional drinks are beverages made to do more than quench thirst, and energy drinks are the best-known group. This page collects every Velora Foods guide on functional drinks in one place, so you can compare caffeine, sugar, calories and ingredients before you buy. Each article is based on product labels and public health guidance, and is written in plain language.
Functional drinks add ingredients such as caffeine, electrolytes, vitamins, amino acids or botanicals to support a specific goal, like alertness, hydration or relaxation. Common types include energy drinks, sports and electrolyte drinks, adaptogen drinks, and zero-sugar sparkling waters with added nutrients. Our guide to 50 energy drinks shows how much caffeine and sugar can differ between products in this group.
If you want a closer look at one product, start with our brand reviews. We cover C4 Energy, Echelon Energy and Free Bird, plus the caffeine and sugar in Monster Energy. For a wider view, see best energy drinks compared in 2026, which sets Red Bull, Celsius, Alani Nu and Bloom side by side. These functional drinks reviews focus on what is on the label rather than on marketing claims.
Not every functional drink is about caffeine. Electra is a low-calorie electrolyte option, while adaptogen drinks use botanicals such as ashwagandha and ginseng as an alternative to coffee and soda. Our comparison of coffee vs energy drinks helps you weigh the two most common choices for a caffeine boost, and you can explore more in our coffee and tea section.
Labels differ a lot, so a quick checklist makes choosing easier:
The U.S. Food and Drug Administration says about 400 milligrams of caffeine a day is not generally associated with negative effects for most healthy adults, though people react differently. Read the FDA guidance on caffeine for details. Because functional drinks vary so much, always read the label. A Monster Original, for example, contains 160 mg of caffeine in a 16 fl oz can. Pregnancy, medication or a health condition may call for a lower limit, so check with a healthcare professional if that applies to you. To keep an eye on your overall intake, try our free daily sugar intake calculator and daily fluid intake calculator.
Energy drinks are one type of functional drink. The wider category also includes electrolyte drinks, adaptogen blends and fortified waters.
It depends on the product, how much you drink and your own health. High caffeine and added sugar are the main concerns. See our article on whether energy drinks are bad for your liver for the risks and safety tips.
Compare caffeine per serving, added sugar and calories, then read the ingredient list for anything you want to avoid. Our energy drinks section has side-by-side comparisons to make this easier.
This content is for education only and is not medical advice. Talk to a healthcare professional about caffeine if you are pregnant or managing a health condition.
When comparing Bloom Energy Drink with Celsius, it is important to note that there isn’t a significant calorie or sugar difference, but rather the two beverages differ in caffeine content and formulation. Bloom Sparkling Energy Energy drinks are zero sugar…
Alani Nu Energy Drink is a caffeine-containing energy drink. Alani Nu Energy Drink is a canned, flavored energy drink formulated to deliver a source of caffeine and a handy energy boost. The official product information page from Alani Nu claims…
A type of caffeinated functional beverage that is sold under the brand name Celsius. The standard CELSIUS and CELSIUS Vibe cans have 200 mg of caffeine, and the CELSIUS Essentials cans have 270 mg of caffeine. The brand offers CELSIUS…
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Introduction Many people drink energy drinks to increase their level of alertness and energy. However, when it comes to two similar products, one question that is always asked is, which is healthier, a sugar-free energy drink or a normal energy…
Bloom Energy Drink is a rising favorite among those that want a fruity, fizzy drink with caffeine but no sugar. Bloom Nutrition’s Sparkling Energy is a convenient ready-to-drink energy drink in five fruity flavors. But how much caffeine does Bloom…
Red Bull side effects explained: caffeine and sugar per can, what the latest reviews found about blood pressure and the heart, FDA and EFSA caffeine limits, and who should be careful.
Red Bull Flavors Ranked: The Complete 2026 Guide Red Bull doesn’t only have an energy drink flavor. The brand has a wide range of fruity, tropical, berry, citrus, and seasonal flavors over the years, offering consumers plenty of choice. Choosing…
