Non-Stim Pre-Workouts and Heart Health: Safer Performance or False Security?

Table of Contents

1. Key Highlights
2. Introduction
3. How stimulants affect the cardiovascular system
4. Mechanisms behind non-stimulant pre-workouts
5. What the evidence says about key non-stim ingredients
6. Comparative performance: stimulants versus non-stimulants
7. Who benefits most from non-stim pre-workouts
8. Safety considerations and red flags
9. How to choose a safe and effective non-stim pre-workout
10. A practical blueprint: sample non-stim pre-workout formula and dosing
11. Monitoring response and adjusting use
12. Drug interactions and medical considerations
13. Real-world examples and case studies
14. Regulatory and quality landscape
15. Myths and misunderstandings
16. Practical protocols for transitioning from stimulant to non-stim
17. Cost and practicality
18. Long-term cardiovascular considerations
19. Common formulations and what to avoid
20. Sample shopping checklist
21. Practical examples of non-stim stacks for common goals
22. The role of lifestyle and training environment
23. Practical monitoring tools and metrics
24. Closing guidance: balancing performance and cardiovascular safety
25. FAQ

Key Highlights

• Non-stimulant pre-workouts reduce the risk of stimulant-driven heart rate and blood pressure spikes by relying on vasodilation, buffering agents, and nootropics rather than caffeine or synephrine.
• Effective non-stim formulas combine clinically supported doses of L-citrulline, beta-alanine, creatine, electrolytes, and focused nootropics; quality, dosing transparency, and medical history determine safety and effectiveness.
• Athletes with cardiovascular concerns, those sensitive to stimulants, and evening trainers benefit most from non-stim stacks, but individual responses and ingredient interactions require caution and physician consultation.

Introduction

Many gym-goers reach for pre-workout powders to sharpen focus, raise power output, and squeeze an extra rep or sprint out of a session. Those who react to stimulants—jittery hands, racing pulse, sleep disrupted for hours—face a familiar trade-off: short-term performance gains versus cardiovascular discomfort. Non-stimulant pre-workouts present an alternative. They promise the same training support without the sympathetic nervous system surge that drives palpitations and blood pressure spikes.

Understanding whether non-stim formulas truly protect the heart requires more than a surface comparison of “stimulant vs non-stim.” It demands a look at mechanisms: how ingredients improve blood flow, buffer fatigue, and support cognition; how dosing and combinations alter physiology; and how personal health history and medication use shape risk. This article maps that terrain. It explains what works, what to watch for, and how to choose and use non-stim pre-workouts to support both performance and cardiovascular safety.

How stimulants affect the cardiovascular system

Stimulant-containing pre-workouts act primarily by activating the sympathetic nervous system. That activation increases circulating catecholamines—adrenaline and noradrenaline—leading to a cascade of cardiovascular effects.

• Heart rate increases as stimulants accelerate sinoatrial node firing. A modest rise can enhance cardiac output during intense exercise, but large or abrupt increases pose risks for those with heart rhythm vulnerabilities.
• Blood pressure climbs through vasoconstriction and increased cardiac contractility. For people with hypertension, this elevation can push readings into dangerous ranges.
• Arrhythmias can be triggered in susceptible individuals. Case reports associate high-dose stimulant supplements with atrial fibrillation, supraventricular tachycardia, and ventricular arrhythmias.
• Perceived anxiety and panic are common side effects. The subjective “racing” sensation may itself provoke physiological responses that feed back on cardiovascular control.

Caffeine remains the most studied ergogenic stimulant. It improves endurance and cognitive performance but raises systolic and diastolic pressure acutely, particularly at higher doses. Other compounds—synephrine, DMAA, DMHA—carry similar or greater cardiovascular risk profiles and have been linked to adverse events.

Regulation gaps and proprietary blends complicate consumer risk assessment. Products sometimes hide stimulant doses under “proprietary blend” labels or contain banned stimulants as contaminants. This unpredictability motivates some consumers toward stimulant-free alternatives.

Mechanisms behind non-stimulant pre-workouts

Non-stim pre-workouts aim to produce performance gains without sympathetic stimulation. They target four main physiological pathways:

• Vasodilation and blood flow: Compounds like L-citrulline and L-arginine support nitric oxide synthesis, relaxing blood vessel walls and improving muscle perfusion. Better blood flow enhances nutrient and oxygen delivery and may aid heat dissipation.
• Intramuscular buffering: Beta-alanine increases intramuscular carnosine levels, which buffer hydrogen ions produced during high-intensity exercise. This delays muscular fatigue and supports repeated sprint or resistance performance.
• Cellular hydration and osmolyte balance: Taurine and betaine contribute to cellular fluid balance and muscle function under thermal or metabolic stress. Hydration status influences both performance and cardiovascular strain during exercise.
• Cognitive and motor support without adrenergic surge: Nootropics such as L-tyrosine and alpha-GPC support neurotransmitter availability and focus without triggering large catecholamine releases. They mitigate the attention and motivation benefits users seek from stimulants while avoiding acute cardiac stimulation.

Ancillary ingredients include creatine for phosphagen energy, electrolytes for volume and conduction stability, and nitrates from beetroot or concentrated sources to feed nitric oxide pathways. Each component contributes to a physiologic effect that supports training without the sympathetic spike stimulants provoke.

What the evidence says about key non-stim ingredients

Peer-reviewed research provides a basis for selecting ingredient types and dosages. Evidence strength differs by compound; dosing matters.

• L-citrulline and citrulline malate: Oral L-citrulline (typically 6–8 g of pure L-citrulline or 8 g citrulline malate) reliably raises plasma arginine and subsequently nitric oxide production more effectively than oral L-arginine. Studies demonstrate modest increases in blood flow and reductions in perceived exertion during high-intensity efforts.
• Beta-alanine: Chronic dosing of 2–5 g daily over several weeks increases intramuscular carnosine and improves performance in exercises lasting one to four minutes and in repeated sprint efforts. A common effective loading dose is 3.2 g/day; paresthesia (tingling) is the most frequent side effect and is dose-dependent.
• Creatine monohydrate: The most robust evidence among ergogenic aids. Daily dosing of 3–5 g increases phosphocreatine stores, improving maximal strength and power and supporting recovery. Creatine does not stimulate heart rate or blood pressure and has a strong safety profile in healthy adults.
• Taurine: Doses between 1–3 g/day support cell hydration and may have cardioprotective properties in some contexts. Taurine modulates ion channels and intracellular calcium handling, important in myocardial function.
• Alpha-GPC and L-tyrosine: Alpha-GPC (300–600 mg) enhances acetylcholine availability and may increase power output in brief maximal efforts. L-tyrosine (500–2,000 mg) supports catecholamine synthesis during stress, potentially preserving cognitive performance during demanding sessions without the acute cardiovascular surge caused by stimulants.
• Nitrate sources (beetroot): Acute and chronic nitrate ingestion reduces oxygen cost during submaximal exercise and improves time trial performance in many studies. Typical effective doses depend on nitrate content but often equal a concentrated beetroot juice or 6–10 mmol of nitrate.

These ingredients exert measurable effects through distinct mechanisms. Combining them thoughtfully can match many performance needs without adrenergic activation.

Comparative performance: stimulants versus non-stimulants

Stimulants deliver immediate perceptual and physiological effects that many athletes prize: heightened arousal, reduced effort perception, and transient improvements in power and endurance. Caffeine improves endurance performance and cognitive function, with typical ergogenic doses between 3–6 mg/kg body weight.

Non-stim protocols require a different expectation. They do not produce the abrupt arousal spike. Instead, they support:

• Sustained power and repeated-sprint ability through creatine and beta-alanine,
• Improved blood flow and reduced muscular fatigue via L-citrulline and nitrates,
• Cognitive steadiness and motor control through nootropics.

When performance is assessed across multiple sessions, non-stim strategies can produce comparable or even superior outcomes for athletes who cannot tolerate stimulants or who experience negative sleep and recovery effects from caffeine. For evening trainers, non-stim options eliminate the risk of late-night arousal. In sports governed by anti-doping rules, non-stim blends reduce the chance of inadvertent positive tests associated with contaminated stimulant products.

Placebo effects remain potent; users expect a pump or jolt. Manufacturers aim to reproduce the psychological component through flavor, texture, and sensory agents (e.g., mild tingling from beta-alanine) to preserve expectancy and training drive without caffeine.

Who benefits most from non-stim pre-workouts

Non-stim pre-workouts suit several populations:

• Individuals with hypertension, coronary artery disease, arrhythmias, or that history in the family. These users avoid stimulant-induced heart rate and blood pressure spikes.
• People with caffeine sensitivity: those who experience jitters, gastrointestinal upset, severe insomnia, or anxiety from caffeine.
• Evening or multiple-sessions-a-day athletes who cannot tolerate adrenal overstimulation close to sleep or between bouts.
• Athletes subject to anti-doping scrutiny or those who train in environments requiring sobriety/clarity without stimulants.
• Older adults or those with autonomic dysfunction who respond poorly to sympathetic surges.

Even among healthy, stimulant-tolerant individuals, non-stim options preserve cardiovascular stability and support volume-dependent performance gains over time.

Safety considerations and red flags

Non-stim does not mean “risk-free.” Several safety considerations merit attention.

• Ingredient interactions: Even benign ingredients can interact with prescription medications. For example, L-tyrosine taken with monoamine oxidase inhibitors (MAOIs) or certain antidepressants risks neurotransmitter imbalance. Nitrate-rich products can potentiate antihypertensives and nitrates used for angina, causing symptomatic hypotension.
• Proprietary blends: These often hide amounts of each ingredient. Small doses of key compounds deliver little benefit while manufacturers sometimes add unknown stimulants elsewhere.
• Contamination and cross-contamination: Supplements manufactured in facilities that process stimulants or banned compounds can carry trace contaminants. Third-party testing (NSF Certified for Sport, Informed Sport) reduces this risk.
• Excessive dosages: Beta-alanine causes paresthesia above certain acute dosages. High nitrate loads can cause gastrointestinal distress. Excessive sodium in electrolyte blends may pose risks for sodium-sensitive hypertensives.
• Symptom monitoring: Dizziness, chest pain, syncope, irregular heartbeat, or unexplained shortness of breath after taking any supplement demands immediate medical evaluation.

Consult a healthcare provider before starting a non-stim product if you are pregnant, breastfeeding, on prescription medication, have diagnosed cardiovascular disease, or are unsure about interactions.

How to choose a safe and effective non-stim pre-workout

Selecting a product requires scrutiny. Follow these steps:

1. Check the ingredient list and doses. Clinically effective ranges exist for many ingredients. L-citrulline at 6–8 g, beta-alanine 2–3.2 g/day, creatine 3–5 g/day, and 300–600 mg alpha-GPC are evidence-backed targets.
2. Avoid proprietary blends or at least prefer products that list ingredient weights. Proprietary blends prevent dose verification and can hide under-dosed key compounds.
3. Prefer third-party tested products. NSF Certified for Sport, BSCG, and Informed-Sport testing confirm label accuracy and screen for banned substances.
4. Read the label for stimulant warnings and check for undisclosed caffeine or DMAA/DMHA analogs. Some “non-stim” items include small caffeine amounts for taste or synergy.
5. Consider form and timing. Powders mix into water and allow adjustable dosing. Gummies or capsules restrict flexibility. Pre-workout timing typically ranges 20–60 minutes before training.
6. Start with a half dose. Confirm tolerance on a low-impact day. Monitor heart rate (resting and post-dose), blood pressure if you have hypertension, sleep, and subjective well-being.
7. Look for non-stim products that include electrolytes and plain creatine to support performance beyond acute sessions.

Brands that emphasize transparency and research-backed formulas typically provide the safest consumer experiences.

A practical blueprint: sample non-stim pre-workout formula and dosing

Below is a sample combination that reflects current evidence for efficacy and safety when used by healthy adults. These are typical single-dose ranges rather than medical recommendations. Adjust under medical supervision.

• L-citrulline: 6–8 g (or 8 g citrulline malate)
• Beta-alanine: 2–3.2 g (note: split doses throughout the day reduce tingling)
• Creatine monohydrate: 3–5 g (daily; consistent use preferred over single pre-workout dosing)
• Alpha-GPC: 300–600 mg
• L-tyrosine: 500–1,000 mg
• Taurine: 1–2 g
• Betaine anhydrous: 1.25–2.5 g
• Electrolytes: Sodium 200–300 mg, Potassium 100–300 mg, Magnesium 50–100 mg
• Optional nitrate source (for endurance): Concentrated beetroot or nitrate yielding ~6–8 mmol nitrate, taken 2–3 hours prior

This blend targets blood flow, buffering, hydration, cognitive readiness, and phosphagen energy. Creatine loading is optional but most gains occur with sustained daily intake. Beta-alanine requires chronic loading to raise intramuscular carnosine—single doses do not confer immediate maximal benefit.

Monitoring response and adjusting use

Use wearable or clinical devices for objective feedback. Track these metrics:

• Resting heart rate and heart rate variability (HRV): A large, sudden heart rate increase after taking a product signals possible stimulant contamination or idiosyncratic reaction.
• Blood pressure: If you have hypertension, measure baseline and after-dose BP. A home cuff validated by clinical standards helps determine tolerance.
• Sleep quality: Monitor sleep onset latency and wakings after evening dosing.
• Subjective metrics: Perceived exertion, alertness, and gastrointestinal comfort.
• Training performance: Power output, reps to failure, sprint times, or time-trial results across weeks give insight into real-world benefit.

If adverse effects occur—palpitations, dizziness, chest discomfort, syncope—stop the product and seek medical evaluation.

Drug interactions and medical considerations

Several potential interactions deserve attention:

• Antihypertensives: Nitrates and other vasodilators can intensify blood pressure lowering, causing dizziness or fainting.
• Monoamine oxidase inhibitors (MAOIs) and certain antidepressants: Amino acid precursors that alter neurotransmitter availability can interact unpredictably with these drugs.
• Warfarin and anticoagulants: Some botanicals or high-dose nutrients influence clotting.
• Diabetes medications: Supplements that shift fluid or electrolyte balance can affect glycemic control and medication dosing.
• Heart rhythm medications: Electrolyte shifts and certain supplements can affect conduction and interact with antiarrhythmics.

Provide your clinician a full supplement list before starting or stopping therapies.

Real-world examples and case studies

Practical anecdotes illustrate how non-stim strategies translate into daily training.

• A middle-aged recreational cyclist with treated hypertension switched from a caffeine-based pre-workout to a non-stim formula centered on citrulline, creatine, and beetroot. He reported stable blood pressure readings, preserved endurance performance in long rides, and improved sleep quality on evening training days.
• A collegiate volleyball player with severe caffeine sensitivity used a non-stim pre-workout containing beta-alanine and alpha-GPC. Over a competitive season, her jump power and reaction times improved while she avoided caffeine-related anxiety and GI upset.
• An elite powerlifter tested a non-stim stack with creatine, beta-alanine, and betaine during competition prep where stimulant use was discouraged. He maintained peak strength outputs while avoiding the jitteriness that previously disrupted arousal control before lifting attempts.

These cases reflect common patterns: non-stim approaches support consistent training and recovery while minimizing cardiovascular and sleep-related side effects.

Regulatory and quality landscape

Supplement regulation differs by country. Manufacturers follow Good Manufacturing Practices (GMP), but oversight is reactive. Third-party certification remains the most reliable consumer safeguard.

• NSF Certified for Sport conducts lot testing and certifies products free of banned substances, suitable for athletes.
• Informed-Sport screens for contamination and provides quality assurance.
• A ConsumerLab or independent lab report can verify ingredient quantities and purity.

Look for batch-specific certificates and avoid products making unrealistic performance claims or promoting unverified “thermogenic” pathways without listing doses.

Myths and misunderstandings

Several myths surround non-stim pre-workouts:

• Myth: Non-stim products are inherently ineffective. Reality: Many non-stim ingredients have strong evidence for specific performance domains—creatine for strength, beta-alanine for repeated sprint efforts, and citrulline for blood flow—though effects can be subtler than stimulant-induced arousal.
• Myth: “Stimulant-free” means no physiological impact. Reality: Non-stim ingredients alter blood flow, buffering, and neurotransmission without triggering sympathetic overactivation.
• Myth: All non-stim products are safe for everyone. Reality: Safety depends on interactions, dosing, and individual health status. A product free of stimulants can still interact with medications or produce side effects.
• Myth: Proprietary blends are just marketing. Reality: Proprietary blends obscure dosing, which can hide under-dosed beneficial ingredients and over-concentrated additives elsewhere in the formula.

Understanding the mechanisms and doses dispels these misunderstandings.

Practical protocols for transitioning from stimulant to non-stim

Athletes accustomed to stimulant pre-workouts may experience an initial drop in perceived intensity. A staged approach helps.

1. Taper caffeine over several days to reduce withdrawal headaches and performance dips. Replace one stimulant session with a non-stim option each week until fully transitioned.
2. Prioritize creatine and beta-alanine loading. Undertake a 4-week beta-alanine and creatine period to build intramuscular stores.
3. Time nitrate sources appropriately—beetroot often requires 2–3 hours to peak plasma nitrate—and use citrulline 30–60 minutes pre-workout for immediate vasodilation.
4. Continue psychological arousal strategies: dynamic warm-ups, tempo breathing, music, and cues to replicate some of the motivational aspects stimulants provide.
5. Track objective performance metrics to validate the switch. Many athletes regain or exceed prior outputs once chronic adaptions to creatine and beta-alanine occur.

This method reduces abrupt losses in training quality and supports long-term cardiovascular stability.

Cost and practicality

Non-stim pre-workout options vary in price. Many premium formulations include clinically dosed ingredients and third-party testing, which increases cost but improves value via efficacy and reduced risk. Bulk purchasing of individual ingredients (creatine, citrulline, beta-alanine) provides a cost-effective alternative and enables dose customization.

Powders offer the most flexibility for dose titration. Capsules and ready-to-drink formats provide convenience at higher cost. For travelers or those on a budget, creatine plus a nitrate-rich whole-food (beetroot juice) and a capsule of alpha-GPC can approximate a commercial non-stim blend.

Long-term cardiovascular considerations

Chronic stimulant use—especially at high doses or in combination with other sympathomimetics—can strain cardiovascular function over time through persistent blood pressure elevation, disrupted sleep and recovery, and potential remodeling consequences in susceptible individuals.

Non-stim approaches focus on improving vascular function and metabolic support. L-citrulline and dietary nitrates have been shown in multiple studies to improve endothelial function. Creatine has neuroprotective and cardioprotective associations in some research contexts. Beta-alanine’s chronic role centers on muscular endurance rather than direct cardiac effects.

Choosing formulas that enhance endothelial health and reduce chronic adrenergic load supports long-term cardiovascular outcomes, particularly for those at increased risk.

Common formulations and what to avoid

Look for formulas that prioritize transparency and evidence-backed doses. Avoid products that:

• Include stimulants despite “non-stim” labeling (double-check the full ingredient panel).
• List a lengthy proprietary blend with no dosages.
• Contain DMAA, DMHA, or undisclosed analogs.
• Make exaggerated claims like “heart-safe” without third-party verification.

Prefer labels that list gram or milligram amounts for each active ingredient and accompany claims with references to clinical trials or dose ranges.

Sample shopping checklist

• Does the product list doses for each ingredient?
• Is there third-party certification (NSF, Informed-Sport)?
• Do ingredient doses align with clinical ranges?
• Are there any stimulants or undisclosed “proprietary” components?
• Does the product include unnecessary fillers or sugar?
• Does it fit budget and training timing needs?

Answering these questions narrows choices to reliable options.

Practical examples of non-stim stacks for common goals

• Strength and power: Creatine 3–5 g + Beta-alanine 3.2 g/day + Alpha-GPC 300–600 mg pre-workout.
• Endurance: Beetroot concentrate (nitrate 6–8 mmol, 2–3 hours pre-event) + L-citrulline 6 g pre-session + Electrolytes during long sessions.
• Hypertrophy training: L-citrulline 8 g + Beta-alanine 2–3 g + Creatine 5 g + Taurine 1–2 g, split morning/evening for beta-alanine if paresthesia occurs.
• Cognitive focus without stimulation: Alpha-GPC 300 mg + L-tyrosine 500–1,000 mg + low-dose rhodiola (if tolerated) alongside hydration.

All stacks require individual adjustment and medical clearance where appropriate.

The role of lifestyle and training environment

Supplements augment training; they do not replace fundamentals. Cardiorespiratory endurance, sleep hygiene, hydration, and progressive overload drive physiologic adaptation. For individuals sensitive to stimulants, improving sleep and managing caffeine timing reduces reliance on pre-workout stimulants. Environmental modifications—cooling strategies in heat, structured warm-ups, and pacing—reduce cardiovascular strain and help non-stim formulas deliver their benefit.

Practical monitoring tools and metrics

• Wearables: Heart rate, HRV, and sleep tracking provide continuous signals about systemic stress and recovery.
• Blood pressure monitors: Home cuffs verify post-dose responses in hypertensive individuals.
• Training logs: Objective performance and subjective readiness ratings document whether non-stim transitions maintain or improve outputs.
• Lab tests: Lipids, fasting glucose, and kidney function if you are using high doses of sodium or have comorbidities. Discuss supplement regimens with your clinician.

Objective data reduces guesswork and confirms whether a non-stim strategy supports your goals safely.

Closing guidance: balancing performance and cardiovascular safety

Non-stimulant pre-workouts provide a credible pathway to improved training without the adrenergic burdens of stimulants. They rely on vascular, metabolic, and cognitive support mechanisms that translate into real performance benefits across many athletic domains. Selecting transparent, evidence-based products and tailoring dosing to personal health status maximizes safety and efficacy.

Athletes and recreational exercisers who prioritize heart health, sleep, or regulatory certainty find non-stim formulas particularly valuable. Implement staged transitions, incorporate creatine and beta-alanine loading periods, and monitor objective markers. Consult healthcare providers when chronic conditions, medications, or pregnancy are factors.

Balanced use of non-stim pre-workouts allows consistent training, recovery, and progress without sacrificing cardiovascular stability.

FAQ

Q: Are non-stim pre-workouts completely safe for people with heart disease? A: Not automatically. Non-stim formulas reduce the risk associated with stimulant-induced heart rate and blood pressure increases. However, ingredient interactions, individual sensitivities, and dosage still matter. People with known heart disease, arrhythmias, or uncontrolled hypertension should consult a cardiologist or healthcare provider before using any supplement.

Q: Can non-stim ingredients like citrulline or nitrates lower blood pressure? A: Vasodilators such as L-citrulline and dietary nitrates can modestly reduce blood pressure and improve endothelial function. These effects are usually beneficial, but when combined with antihypertensive medications they can cause excessive drops in blood pressure. Monitor readings and discuss use with a clinician.

Q: How long does it take for beta-alanine and creatine to work? A: Creatine increases muscle phosphocreatine stores over days to weeks; consistent daily dosing of 3–5 g produces benefits in strength and power over weeks. Beta-alanine requires chronic supplementation (2–4 weeks or longer) to raise carnosine in muscle and yield performance benefits in high-intensity efforts.

Q: What are common side effects of non-stim pre-workouts? A: Beta-alanine can cause paresthesia (tingling). High nitrate intake can cause gastrointestinal discomfort. Some individuals may experience headaches or mild GI upset from concentrated amino acids. Monitor symptoms and adjust dosing.

Q: Are non-stim pre-workouts legal for competition? A: Most non-stim ingredients are permitted, but contamination or mislabeled stimulants can create problems. Choose third-party tested products (NSF Certified for Sport, Informed-Sport) to minimize the risk of banned substances.

Q: Is it safe to take non-stim pre-workouts daily? A: Many constituent ingredients are safe with daily use when dosed appropriately—creatine, beta-alanine, and citrulline among them. Long-term safety depends on doses, individual health status, and quality of the product. Periodic breaks and clinician consultation are prudent.

Q: Should I stop caffeine completely when switching to non-stim? A: Not required, but tapering caffeine gradually reduces withdrawal effects. Maintain caffeine moderation (generally under 3–6 mg/kg/day) and avoid consuming it close to bedtime to preserve sleep.

Q: How do I tell if a product labeled “non-stim” still contains stimulants? A: Check the full ingredient list for caffeine, guarana, yerba mate, kola nut, or other stimulant sources. Beware of terms like “thermogenic” or “fat-burner” that often imply stimulant inclusion. Prefer products that list ingredient amounts and display third-party testing logos.

Q: Can non-stim pre-workouts help me train harder? A: Yes. By improving blood flow, buffering capacity, cellular hydration, and cognitive clarity, non-stim blends support higher-quality training sessions. Gains accrue over weeks as intramuscular and vascular adaptations develop.

Q: What should I do if I experience palpitations after taking a non-stim product? A: Stop the supplement immediately and seek medical evaluation. Palpitations require assessment to rule out contamination with stimulants, underlying arrhythmias, or other causes. Provide your healthcare provider with the supplement label and batch number if possible.