Written by: Ryan Gardner, Owner, Managing Partner, CEO, Bucked Up

Key Takeaways

• Conventional energy drinks combine high caffeine loads with additional stimulants like guarana and taurine, which can create cardiac risks for individuals with inherited heart conditions such as long QT syndrome.

• Research, including a 2024 Mayo Clinic study, links energy drink consumption to sudden cardiac arrest in patients with confirmed genetic arrhythmia conditions, so active adults with family cardiac histories should use caution.

• Stimulant ingredients in energy drinks can prolong QTc intervals and increase heart rate and blood pressure, which may interact with genetic vulnerabilities and trigger dangerous arrhythmias during exercise.

• Non-stimulant pre-workout formulas using ingredients like citrulline malate and beta-alanine support performance through vasodilation and acid buffering without the cardiovascular strain associated with stimulants.¹

• Bucked Up offers a transparent, stimulant-free pre-workout option manufactured in the USA in GMP-certified facilities, which follow standardized practices for consistency and quality control; shop now to explore a responsible alternative for your training goals.

The Problem: How Energy Drinks Raise Risk for Genetic Heart Conditions

Conventional energy drinks are rarely just caffeine. Common additional stimulant-related ingredients include guarana, yerba mate, and green tea extract, which can push total stimulant exposure well beyond what the caffeine figure on the label suggests. A single energy drink may contain between 100 and 350 milligrams of caffeine, compared with roughly 100 milligrams in an 8-ounce cup of coffee, and that caffeine arrives alongside taurine, guarana, ginseng, B vitamins, and often a substantial sugar load.

The cardiac concern is real for people with inherited heart issues. Research published in Heart Rhythm notes that energy drinks may trigger life-threatening arrhythmia or even sudden cardiac arrest, especially in individuals with underlying genetic heart conditions. A 2024 Mayo Clinic retrospective study of 144 sudden cardiac arrest survivors with confirmed arrhythmogenic conditions found that 7 patients (5%; mean age 29 years) experienced sudden cardiac arrest in temporal association with energy drink consumption. All 7 survivors quit energy drinks after their event and remained event-free during follow-up.

The electrical mechanism at the center of this concern is QTc prolongation. Consuming 32 ounces of energy drinks in one hour has been shown to produce abnormal electrical activity in the heart (QTc prolongation), a marker that can predispose individuals to dangerous arrhythmias, and these electrical changes are not typically observed with caffeine alone. That last point matters. The combination of ingredients, not any single compound, appears to be driving the risk. This multi-ingredient interaction becomes especially concerning for people with specific genetic vulnerabilities, particularly long QT syndrome.

Stimulants and Long QT Syndrome: Why Genetics Change the Equation

Long QT syndrome (LQTS) is a condition in which the heart’s electrical reset time between beats is abnormally extended. Stimulant exposure from energy drinks can directly worsen that extension. Studies have shown that ingredients in energy drinks can interfere with the heart’s electrical function, producing measurable changes in the QTc interval, and prolonged QTc intervals are especially concerning for inherited rhythm disorders like LQTS because the drinks directly extend the heart’s electrical reset time between beats.

The 2024 Mayo Clinic cohort makes the genetic specificity concrete. Several sudden cardiac arrest cases were temporally linked to energy drink consumption among patients with confirmed arrhythmogenic conditions.

Exercise can stack additional stress on top of these vulnerabilities. High-dose or fast-acting caffeine products such as energy drinks can deliver 200 to 400 mg of caffeine at once, prompting a rapid rise in blood pressure and heart rate that carries more risk for people with hypertrophic cardiomyopathy (HCM) than moderate sources like coffee or tea. In obstructive HCM, caffeine can worsen outflow obstruction, while in non-obstructive HCM it may trigger dangerous arrhythmias. Dehydration, which exercise accelerates, adds another layer of strain. Many pre-workout and energy drink ingredients act as diuretics, and combined with exercise-induced sweating, this raises dehydration risk, thickens blood, and forces the heart to work harder to maintain circulation.

Genetic heart conditions affect a notable portion of the population, most of whom are unaware, and for these individuals, stimulant exposure from energy drinks can trigger life-threatening events. If you have a family history of inherited cardiac conditions and have not been formally evaluated, that context matters before any stimulant decision. For individuals in this position, or anyone who wants to avoid stimulant-related cardiac stress, non-stimulant pre-workout formulas offer a performance pathway that sidesteps these mechanisms.

Non-Stimulant Pre-Workouts: How They Support Training Without Extra Cardiac Strain

Non-stimulant pre-workout formulas form a separate category from energy drinks. They are designed to support training performance through mechanisms that do not rely on large stimulant loads. The core ingredients in this category work through vasodilation, acid buffering, and cognitive support pathways rather than adrenergic stimulation.

L-citrulline and citrulline malate act as nitric oxide enhancers that support vasodilation and muscle oxygenation, and can help reduce muscle soreness post-exercise.¹ Beta-alanine supports muscle carnosine saturation, which helps buffer lactic acid during high-intensity effort.¹ Beta-alanine and citrulline malate are generally well-tolerated with no serious adverse cardiovascular effects reported in the literature at typical doses.

A 2025 integrative review in the Journal of Cardiovascular Development and Disease found that cardiovascular adverse events such as palpitations from pre-workout supplements are often restricted to individuals with preexisting health conditions or specific intolerances, and most non-stimulant pre-workout supplements are generally safe when consumed in recommended doses.

Bucked Up’s Non-Stimulant Pre-Workout is formulated without caffeine and without other stimulant compounds. Key ingredients include Citrulline Malate, Beta-Alanine, AlphaSize® Alpha GPC (which supports mental focus*), Senactiv® (which may support VO2 max and athletic performance*), Deer Antler Velvet, Astragin®, Taurine, Himalayan Rock Salt, Vitamin B12, and Sodium.¹ The formula is manufactured in the USA in GMP-certified facilities, and every ingredient amount is disclosed on the label. No proprietary blends and no hidden stimulants. Shop now and see the full label for yourself.

How to Evaluate Supplements: Four Clear Safety and Transparency Checks

When evaluating any performance supplement against energy drink safety with genetic heart disease risk, four criteria are worth applying systematically.

1. Full ingredient disclosure. Look for products that list every ingredient with its exact dose. Transparent labeling with specific ingredient doses allows verification of amounts, unlike proprietary blends that obscure individual dosing. If a label says “proprietary blend” without individual quantities, you cannot assess stimulant load or compare it against any threshold.

2. Stimulant inventory. Caffeine is not the only stimulant to check. Guarana is a plant-based stimulant that contains caffeine and may not always be clearly quantified on energy drink labels, which makes total caffeine intake harder to judge. Synephrine, yohimbine, and DMAA are additional compounds that can amplify cardiovascular strain when combined with caffeine, including elevated heart rate and blood pressure.

3. Manufacturing standards. GMP certification means a facility follows standardized manufacturing practices for consistency and quality control. It serves as a baseline indicator of production rigor, not a guarantee of any specific outcome. Beyond how a product is made, consider how it is consumed.

4. Intended use case. Energy drinks are typically consumed rapidly and in large volumes, which accelerates stimulant delivery. Pre-workout supplements are measured by scoop, mixed with water, and consumed over a defined window before training, which gives more control over timing and dose.

For beginners or those new to performance supplements, a stimulant-free formula removes the stimulant variable entirely. For daily training at moderate intensity, a non-stimulant option supports energy levels*, mental focus*, muscle endurance*, and pump* without the same stimulant load as conventional energy drinks.¹ For advanced athletes who train at night or are cycling off stimulants, stimulant-free formulas help preserve training quality while reducing the chance of sleep disruption or added cardiac stress.

Choosing by Tolerance, Workout Timing, and Daily Routine

Stimulant sensitivity exists on a spectrum. Some people metabolize caffeine quickly and tolerate 200 mg without issue. Others experience palpitations, anxiety, or disrupted sleep at half that dose. Genetic variants in the CYP1A2 enzyme affect caffeine metabolism rates, and individuals with inherited cardiac vulnerabilities face an additional layer of consideration that goes beyond tolerance alone.

For anyone with a family history of LQTS, CPVT, HCM, or idiopathic ventricular fibrillation, the research above supports a conversation with a cardiologist before using any stimulant-containing product. Individuals with any form of cardiovascular condition, arrhythmias, or other heart-related issues should consult a healthcare professional before using pre-workout supplements to avoid exacerbating these conditions.

Workout timing is a practical factor independent of cardiac history. Evening training sessions often pair poorly with high-caffeine products for most people. A stimulant-free formula supports the same training session while reducing the risk of sleep disruption that can compound recovery deficits over time.

Bucked Up’s Non-Stimulant Pre-Workout is available at select retail locations. Use the Bucked Up store finder to locate it near you. For direct ordering, shop now at Bucked Up’s online store.

Best Practices for Hydration, Dosing, and Safer Use

Hydration is non-negotiable when training with any performance supplement. Pediatric cardiologist Robert Whitehill, MD, advises patients with heart conditions to drink water or electrolyte-containing beverages alongside any supplement to help prevent dehydration. Non-stimulant formulas that include electrolytes such as Himalayan Rock Salt and Sodium, as found in Bucked Up’s Non-Stimulant Pre-Workout, support fluid balance during training.¹

Avoid combining any performance supplement with alcohol. University of Rochester Medical Center recommends avoiding mixing energy drinks with alcohol, as the combination can worsen cardiac effects. The same logic applies to stimulant-containing pre-workouts. Beyond avoiding dangerous combinations, proper dosing matters from your first use.

Start with the serving size on the label. Individual responses to ingredients like beta-alanine, which can cause harmless tingling known as paresthesia, vary, and beginning with a half-serving allows you to assess tolerance before committing to a full dose. Listen to your body. If you experience palpitations, chest discomfort, or unusual shortness of breath during training, stop and consult a healthcare provider.

Frequently Asked Questions

Are energy drinks safe for people with heart conditions?

Energy drink safety for people with heart conditions depends heavily on the specific condition and the product’s ingredient profile. For individuals with inherited arrhythmia syndromes such as long QT syndrome or catecholaminergic polymorphic ventricular tachycardia, the combination of high-dose caffeine, guarana, taurine, and other stimulants found in many energy drinks has been associated with serious cardiac events in peer-reviewed research. The 2024 Mayo Clinic study mentioned earlier found that sudden cardiac arrest cases in this population were temporally linked to energy drink consumption, which reinforces the concern for individuals with inherited arrhythmia syndromes. For individuals with any known or suspected cardiac condition, consulting a cardiologist before consuming energy drinks or stimulant-containing supplements is the appropriate first step. Non-stimulant performance supplements formulated without caffeine or other sympathomimetic compounds represent a category that avoids the stimulant-related mechanisms of concern, though any supplement decision should be made in consultation with a qualified healthcare provider.

What do cardiologists think of energy drinks?

Cardiologists have expressed consistent concern about energy drink consumption, particularly for individuals with underlying cardiac vulnerabilities. Dr. Sadeer Al-Kindi, a preventive cardiologist at Houston Methodist, has stated that for a person with a pre-existing cardiovascular condition or predisposition to arrhythmia, energy drink consumption increases the risk of adverse outcomes such as arrhythmias. Dr. Wilson Tang at Cleveland Clinic has noted that the rapid delivery mechanism of energy drinks poses particular risks for people with hypertrophic cardiomyopathy compared with slower-acting caffeine sources. Dr. Mehmet Aktas at the University of Rochester Medical Center has stated that energy drinks’ high caffeine combined with other stimulants may cause tachycardia, arrhythmias, hypertension, and arterial spasms. The general cardiological consensus is that individuals with known heart conditions should approach energy drinks with significant caution and seek provider guidance before use.

How do long-term effects of energy drinks on the heart compare with non-stimulant alternatives?

The long-term cardiovascular effects of energy drinks remain an active area of research. A 2025 systematic review in Current Cardiology Reports of 37 studies found that energy drinks frequently lead to increased heart rate, with 60.9% of analyzed studies showing a measurable rise following consumption. Regular high-stimulant energy drink use has been associated in case reports with arrhythmias, elevated blood pressure, and other irregular heartbeats. By contrast, non-stimulant pre-workout ingredients such as citrulline malate and beta-alanine at recommended doses have not been associated with serious adverse cardiovascular effects in the published literature. The 2025 integrative review in the Journal of Cardiovascular Development and Disease found that cardiovascular adverse events from pre-workout supplements are often restricted to individuals with preexisting conditions or specific intolerances. Long-term comparative data between these two categories in populations with genetic heart conditions specifically is limited, so provider consultation remains important for this group.

What should I look for in a quality stimulant-free pre-workout option?

Four criteria are worth prioritizing. First, full ingredient transparency, where every ingredient appears with its exact dose so you can verify what you are consuming. Second, absence of stimulants, which means checking not just for caffeine but for guarana, synephrine, yohimbine, DMHA, and DMAA, all of which carry stimulant activity. Third, evidence-supported ingredients at recognized doses, including compounds like citrulline malate, beta-alanine, and AlphaSize® Alpha GPC that have been studied in sports nutrition research at the doses listed on the label. Fourth, manufacturing standards, where GMP-certified production in the USA provides a baseline of quality control. Bucked Up’s Non-Stimulant Pre-Workout aligns with these criteria through full label disclosure, zero stimulants, recognized performance ingredients including Citrulline Malate, Beta-Alanine, AlphaSize®, Senactiv®, and Astragin®, and GMP-certified domestic manufacturing.

Conclusion: Matching Performance Support With Cardiac Awareness

Energy drink safety with genetic heart disease risk deserves serious attention. The peer-reviewed record, including a 2024 Mayo Clinic study linking energy drink consumption to sudden cardiac arrest in patients with LQTS and CPVT, makes the stimulant-related mechanisms concrete. For active adults with family histories of inherited cardiac conditions, the combination of high-dose caffeine, guarana, taurine, and other stimulants found in conventional energy drinks represents a risk profile that calls for careful consideration.

Non-stimulant pre-workout formulas offer a path to supporting energy levels*, mental focus*, muscle endurance*, and pump* without that stimulant load.¹ Bucked Up’s Non-Stimulant Pre-Workout is built on fully disclosed, evidence-supported ingredients, manufactured in GMP-certified facilities in the USA, and formulated for individuals who want performance support without caffeine or other stimulants. No hidden compounds and no proprietary blend guesswork, only transparent ingredients at disclosed doses.

Your training can support both performance and responsibility. Shop now and find the stimulant-free formula that fits your goals.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

References

Lexington Clinic. (2025). How energy drinks impact your heart rate and why knowing your number matters.

Houston Methodist. (2026, April). Could energy drinks be bad for your heart?

Baptist Health. (n.d.). How energy drinks affect your heart.

Children’s Healthcare of Atlanta. (n.d.). Energy drinks and teens’ hearts.

Bale Doneen Method. (n.d.). Can energy drinks cause heart attacks?

University of Rochester Medical Center. (n.d.). Are energy drinks bad for you?

Cleveland Clinic. (n.d.). Hypertrophic cardiomyopathy and caffeine.

Qaly. (n.d.). Are energy drinks bad for your heart?

News Medical. (2025). Beyond caffeine: Pre-workout ingredients for energy, endurance, and performance.

Superpower. (n.d.). Pre-workout supplements guide.

PubMed / Mayo Clinic. (2024). Retrospective study of sudden cardiac arrest survivors with genetic arrhythmia conditions and energy drink consumption.