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

Key Takeaways for Endurance Athletes

• Standard pre-workouts often cause energy crashes during long runs or rides. Sustained-release formulas better support sessions lasting over 90 minutes.¹
• Endurance athletes benefit from full ingredient transparency, clinically dosed citrulline for blood flow, and beta-alanine for lactic acid buffering to maintain performance with fewer digestive issues.¹
• Planned caffeine timing, including delayed-release forms, supports consistent energy throughout extended training and can reduce post-workout fatigue.¹
• Ingredients such as Senactiv and electrolytes can support recovery, hydration, and overall capacity during high-volume endurance training blocks.¹
• Bucked Up offers transparent, endurance-focused pre-workout formulas designed for sustained performance, so shop now to fuel your next long run or ride.

Pre-Workout Checklist for Distance Runners and Cyclists

Use this checklist before choosing a pre-workout for long-distance running or cycling.

• Full ingredient transparency with clearly disclosed dosages (no proprietary blends)
• Citrulline malate at about 8 g or pure L-citrulline at 6 g for blood flow support*
• Beta-alanine at 3–6 g daily, typically 4–6 g, taken consistently for 4 or more weeks. This schedule helps increase muscle carnosine, which then buffers lactic acid during high-intensity exercise.*
• Caffeine timed before training within the standard 30–60 minute pre-exercise window
• Electrolytes included for longer endurance sessions
• Stimulant-free options available for caffeine-sensitive athletes or evening training

How Pre-Workout Supports Endurance Running

Pre-workout supplements can support endurance running performance through ingredients that match the demands of prolonged aerobic exercise.¹ Multiple meta-analyses confirm caffeine’s ergogenic effects on endurance performance, with effect sizes reaching 0.51 for aerobic exercise when properly dosed.

The main difference between endurance-focused and standard pre-workouts lies in ingredient selection and timing. Endurance runners often perform better with sustained energy release rather than sharp stimulation, so delayed-release caffeine formulations can be especially useful for runs lasting longer than 60 minutes.¹

Pre-Workout Considerations for Cycling Sessions

While running and cycling share many endurance demands, cycling sessions present unique considerations for pre-workout use, especially around gastrointestinal comfort and sustained power output. Cyclists taking 6 g of citrulline malate showed improved time to exhaustion on treadmill testing, and a 7-day regimen improved 4 km cycling time trial performance by 1.5%.¹

For cycling sessions that last 90 minutes or longer, pre-workout timing becomes more critical. Take your pre-workout within the standard 30–60 minute window before you start riding so peak ingredient levels align with your hardest intervals.

Sustained Energy Through Smart Caffeine Timing

The International Society of Sports Nutrition recommends 3–6 mg/kg body mass of caffeine, taken about 60 minutes before exercise, as an effective ergogenic protocol.¹ For a 150 lb athlete, this range translates to roughly 200–400 mg of caffeine.

Some advanced formulas combine microencapsulated delayed-release caffeine with immediate-release caffeine. This combination can provide more stable energy and reduce the sharp peaks and crashes seen with single-source caffeine products.¹ It also supports performance across longer training sessions while helping limit post-exercise fatigue.

Lactic-Acid Buffering with Beta-Alanine

Beta-alanine acts as an intracellular buffer and supports the body’s ability to manage acid buildup during intense efforts.¹ A 2026 meta-analysis reports that β-alanine supplementation shows its most consistent ergogenic effects in high-intensity efforts lasting about 1–4 minutes, when glycolytic contribution and proton accumulation are high.¹

As noted in the checklist above, beta-alanine dosing typically ranges from 3.2–6.4 g per day, divided into smaller servings of 0.8–2 g each. Dividing the dose can reduce the tingling sensation, called paresthesia, which usually fades within 15–20 minutes after consumption.

Blood-Flow Support with Clinically Dosed Citrulline

L-citrulline supports nitric oxide production, which may improve oxygen delivery to working muscles during long efforts. Research on citrulline and performance has identified effective dose ranges, yet many commercial products include only 2–3 g, which often falls below amounts used in studies.

For endurance athletes, clinically dosed citrulline matters during long aerobic efforts. Adequate dosing can support sustained vascular function in events such as ultrarunning or century rides.¹

Extra Endurance Support from Senactiv

Senactiv belongs to a newer group of performance-supporting ingredients developed with endurance in mind. This compound supports exercise performance and muscle recovery while helping overall exercise capacity*, which can be useful during high-volume training blocks.¹

Traditional stimulants focus on immediate energy. Senactiv instead works through cellular pathways that support sustained performance and recovery*, so it can complement caffeine-based energy rather than replace it.¹

How to Choose a Pre-Workout Formula for Endurance

Endurance athletes benefit from prioritizing transparency over marketing claims when choosing pre-workout supplements. Look for products that list exact ingredient amounts instead of using proprietary blends. Beyond transparency, consider whether you want stimulants at all, since stimulant-free pre-workout options have grown in popularity among athletes who want non-caffeine performance support.

Standard stimulant formulas often fit morning training sessions. Stimulant-free versions work better for evening workouts or athletes who react strongly to caffeine. High-stimulant formulas may suit athletes with higher caffeine tolerance who train during their natural peak energy hours.

Managing Caffeine Sensitivity and Hydration Needs

Caffeine sensitivity affects many athletes, so stimulant-free pre-workouts can play an important role in endurance training. These products rely on L-citrulline, beta-alanine, and other performance-supporting compounds to enhance training capacity without stimulant-related side effects.

Endurance athletes often focus more on carbohydrate and electrolyte intake than typical strength-focused users. Some pre-workout powders include sodium, potassium, and magnesium to support hydration and muscle contraction during long sessions.

Conclusion: Transparent Pre-Workouts Tailored to Endurance

Effective pre-workout supplements for endurance runners and cyclists focus on sustained performance instead of short bursts of stimulation. Strong options combine clinically dosed L-citrulline, beta-alanine, and smart caffeine timing to support energy, focus, and blood flow throughout extended training.¹

Bucked Up’s transparent approach to pre-workout formulation addresses the specific needs of endurance athletes with science-backed ingredients at effective doses. Whether you are training for a marathon, a century ride, or simply want reliable energy for long workouts, choosing a pre-workout with full ingredient disclosure helps you understand exactly what you are taking. Shop now to see how transparent, endurance-focused formulations can support your training.

Frequently Asked Questions

How long before my run or ride should I take pre-workout?

Take your pre-workout within the standard 30–60 minute window before you begin your endurance session. This timing helps align peak ingredient levels with your hardest training segments. For sessions longer than 90 minutes, look for formulas that include delayed-release caffeine to support energy across the entire workout and reduce mid-session crashes.

Can I use pre-workout for both running and cycling training?

The same pre-workout formulation can usually support both running and cycling performance. Key ingredients that help endurance athletes, such as citrulline for blood flow support, beta-alanine for lactic acid buffering, and well-timed caffeine, work across different endurance sports. Focus on products with transparent labels and clinical dosing instead of sport-specific marketing claims.

What should I look for in a pre-workout if I’m sensitive to caffeine?

Choose stimulant-free pre-workout formulations that rely on clinically dosed citrulline and beta-alanine, along with performance-supporting compounds like Senactiv. You can reference the checklist above for specific citrulline and beta-alanine amounts. These ingredients support energy and endurance through non-stimulant pathways, which makes them suitable for evening training or for athletes who experience jitters, anxiety, or sleep disruption from caffeine.

How do I avoid gastrointestinal issues during long endurance sessions?

Start with lower doses of your pre-workout to gauge tolerance and adjust from there. Avoid high-fiber or high-fat meals for 2–3 hours before training, since these can slow digestion. Many athletes also do well with pre-workouts that include electrolytes for longer sessions, and some prefer splitting their serving, taking half about an hour before exercise and the rest closer to the start.

Do I need different pre-workout doses for different training intensities?

Adjust your pre-workout strategy based on training intensity and duration instead of frequently changing ingredient doses. For easy aerobic days, consider stimulant-free options or lower-caffeine formulas. Reserve full-dose, higher-stimulant pre-workouts for demanding sessions such as high-intensity intervals, tempo runs, or race-pace efforts where you want maximum performance support.

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