How Long Does Celsius Last in Your Body?

Image from Celsius

The stimulating effects of caffeine in this drink can last about 3 to 6 hours. However, this duration varies depending on many factors, including metabolism, caffeine sensitivity, and the amount consumed.

So, how long does Celsius last for an active individual? To understand the duration and the effects of drinking Celsius, let’s discuss what’s in this beverage and who it’s for.

How Long Does Celsius Energy Drink Take to Kick in?

The time it takes to kick in can vary from person to person. Generally, you may feel the effects within 15 to 30 minutes after consumption as the caffeine and other stimulating ingredients begin to enter your bloodstream.

Initially, you might experience increased alertness, improved focus, and a subtle energy boost, which can peak within 1 to 2 hours after consumption. However, the duration of the energy-boosting effects can vary, with some people experiencing sustained energy for several hours while others notice a gradual decline after the initial peak.

The effects of this beverage can last for several hours, generally ranging from 3 to 5 hours. During this time, you may experience sustained energy and improved mental clarity. Caffeine, a key ingredient in this beverage, has a half-life in the human body, which means it takes about 5 to 6 hours for the concentration in your bloodstream to decrease by half. 

The remaining stimulant is gradually metabolized and excreted by your body over several hours.

Individual factors influence how long this beverage lasts in your body. These factors include your tolerance to caffeine, body weight, metabolism, and other substances you may have consumed that can affect caffeine metabolism (e.g., medications and other caffeinated products).

Staying hydrated and frequent urination can influence how quickly your body processes and eliminate caffeine and other ingredients from the energy drink.

Further, drinking water can help dilute the caffeine and potentially reduce its stimulating effects.

After the stimulating effects wear off, some individuals may experience an energy crash or a period of fatigue that varies in duration and intensity.

What’s in Celsius Energy Drinks?

These are a few of the contents in your Celsius drink:

Carbonated Water

The base of most energy drinks is carbonated water, which gives them a fizzy and refreshing quality.


Celsius contains natural caffeine from various sources. The caffeine level may vary between flavors and formulations but is around 200 milligrams per 12-ounce can. This ingredient is a central nervous system stimulant that can help increase alertness and provide a quick energy boost.

It’s the primary active ingredient. Therefore, it’s responsible for delivering the drink’s energy level. Caffeine blocks adenosine receptors in the brain, increasing alertness and reducing the perception of fatigue.

In the Celsius drink, caffeine enhances mental focus. This stimulant is one of the reasons you’ll see campaigns marketing Celsius Original for weight loss.

Green Tea Extract

It’s a common ingredient in energy drinks, including this one, used for its high natural caffeine content and potential health benefits from antioxidants. The specific type and amount of green tea extract can vary. 

Guarana Extract

Guarana has a high caffeine content. They add this plant-derived caffeine to Celsius Heat to provide additional caffeine and stimulate alertness.

Ginger Extract

Some Celsius energy drinks contain ginger extract, which may contribute to flavor and provide digestive benefits.


It’s an amino acid believed to have potential performance-enhancing effects in combination with caffeine.

Ginseng Extract

Ginseng is an adaptogenic herb used in traditional medicine for its potential to improve mental clarity and energy levels. It’s in some Celsius formulations.


Celsius typically includes a blend of B vitamins, such as B3 (niacin), B6 (pyridoxine), and B12 (cobalamin). They assist in energy metabolism and can help support the body’s energy production.

Citric Acid

It’s a flavor and preservative that gives the drink a tart taste.


This calorie-free artificial sweetener provides sweetness without added sugars.

Potential Risks and Effects of Celsius Energy Drink

Like many other energy drinks, it contains ingredients that can have various side effects and risks when consumed in excess or by individuals with specific sensitivities or health conditions. Here are some potential risks and side effects associated with Celsius.

Caffeine-related Effects

Celsius contains caffeine. As such, it can lead to side effects like jitteriness, nervousness, increased heart rate, and difficulty sleeping if consumed in excess. Caffeine sensitivity varies from person to person. Consequently, some individuals may experience these effects more severely than others.


If you rely on Celsius for hydration, it may not be as effective as plain water or sports drinks designed for rehydration since it’s a performance and energy-enhancing beverage rather than a hydrating one. 

While it does contain water as its base ingredient, it also contains caffeine and other compounds that can have diuretic effects, potentially leading to increased urination and fluid loss. Therefore, consume this and drink water, especially if you’re physically active or in a hot environment.

Digestive Distress

Some individuals may experience stomach discomfort, acid reflux, or gastrointestinal upset due to caffeine and other compounds.

Blood Pressure and Heart Health

High caffeine intake can temporarily elevate blood pressure. Thus, it’s a concern for individuals with hypertension or heart conditions.

Insomnia and Sleep Disturbances

Consuming this beverage too close to bedtime can interfere with sleep patterns, as caffeine can disrupt the ability to fall asleep and stay asleep.

Anxiety and Nervousness

The stimulating effects of caffeine can exacerbate symptoms of anxiety and nervousness in susceptible individuals.

Dependency and Withdrawal

Regular consumption can lead to caffeine dependence, and abrupt discontinuation may result in withdrawal symptoms such as headaches, fatigue, and irritability.


Over time, you may develop tolerance to caffeine in Celsius, requiring higher doses to achieve the same level of alertness or energy.

Allergic Reactions

You may have allergies or sensitivities to specific ingredients in Celsius, such as certain flavorings or preservatives.


Drinking multiple cans in a short period can lead to excessive caffeine intake, which can result in serious health issues such as heart palpitations, arrhythmias, or caffeine toxicity.

Tips on How to Consume Celsius Energy Drink

Read the Label

Always start by reading the product label for information on caffeine content, serving size, and any specific instructions or warnings. It helps you make an informed decision about consumption.


Limit your consumption to enjoy the potential benefits without experiencing some of the side effects mentioned above. One drink has around 200 milligrams of caffeine, roughly equivalent to the caffeine in a cup of coffee.

Stay Hydrated

Remember that Celsius isn’t a water replacement. It’s important to continue drinking water throughout the day to stay adequately hydrated, especially if you’re active or in a hot environment.

Time it Right

Consider when you consume the drink. Avoid drinking it just before you go to bed, as caffeine can interfere with sleep. 

Individual Tolerance

Be aware of your caffeine sensitivity. Some individuals are more sensitive to caffeine than others. If you’re not a regular caffeine user, start with half a can or choose the lower caffeine versions of Celsius, if available.

Dietary Considerations

Check the product label to ensure Celsius fits your dietary plan if you have dietary restrictions or preferences. Some versions may be vegan, gluten-free, or keto-friendly, while others may not be.

Exercise and Activity

Marketers promote Celsius as a workout companion. If you plan to consume it before exercise, allow enough time for digestion to prevent digestive discomfort during your workout.

Avoid Mixing with Alcohol

The stimulating effects of caffeine may mask the depressant effects of alcohol, potentially leading to overconsumption and adverse health effects.

Listen to Your Body

How your body reacts should guide your consumption. If you experience any adverse effects like palpitations, anxiety, or digestive problems, discontinue use and consult a healthcare professional.

Consult a Healthcare Professional

If you have underlying health conditions or are unsure whether Celsius suits you, consult a healthcare professional or a registered dietitian first. Remember that Celsius shouldn’t replace a balanced diet or a healthy lifestyle. Consume it alongside a healthy diet and regular physical activity to gain specific health or fitness goals.


Celsius is one beverage with dozens of informational articles online. You’ll not know what to read first or last. The bottom line is it’s a caffeine-rich drink manufactured to boost your energy and enhance your performance. 

As such, it has many other ingredients that work alongside caffeine, including green tea extracts. The energy boost can start within 15 minutes and last until caffeine exits your body hours later. However, this duration varies from one person to the other.


Is Celsius suitable for athletes or those engaging in intense workouts?

Yes, it’s often marketed as a fitness and performance-enhancing beverage, as it contains caffeine and other ingredients that may provide an energy boost and increased alertness during physical activities.

How long does Celsius last before it goes flat or loses its flavor?

It’s best to consume it within 24 to 48 hours to enjoy its flavor and carbonation. The drink may lose some of its fizziness and taste over time.

How long does a can of Celsius give me an energy boost?

The duration is different for everyone. Generally, expect the effects to last a few hours. 

Last Updated on December 11, 2023

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