Good Pre-Workout Supplements: What to Look For and What Actually Works

The Ingredients with the Strongest Evidence

Caffeine

Caffeine is the most studied ergogenic aid in sports nutrition. It works primarily by antagonizing adenosine receptors in the brain, reducing perceived effort and delaying the onset of fatigue. Research consistently shows that caffeine at doses of 3 to 6 mg per kilogram of body weight may support endurance performance, muscular power output, and reaction time across a range of exercise modalities. The effect on strength training is more modest but still present at adequate doses.

Caffeine's impact varies significantly by individual. People with genetic variants affecting CYP1A2 enzyme activity metabolize caffeine at different rates, which means effective timing and dose are not the same for everyone. Habitual high intake also blunts the acute response. Importantly, caffeine raises blood pressure transiently and may affect fasting glucose measurements — if you are testing these markers, timing matters. Reference ranges vary by laboratory and individual; results should be interpreted by a qualified provider.

Creatine monohydrate

Creatine is not strictly a pre-workout compound — it works through chronic saturation of muscle phosphocreatine stores rather than acute pre-session priming. But it appears in many pre-workout formulas, and it is one of the most consistently supported supplements in the literature. Research demonstrates that creatine supplementation may support muscular strength, high-intensity exercise capacity, and lean body mass over time. The mechanism involves replenishing ATP more rapidly during short, explosive efforts.

Creatine monohydrate is the form with the most evidence and the lowest cost. Doses of 3 to 5 grams daily produce equivalent results to loading protocols over several weeks. Note that creatine supplementation raises serum creatinine modestly, which can affect the interpretation of kidney function markers — a relevant consideration if you are tracking eGFR or creatinine levels alongside training.

Beta-alanine

Beta-alanine is the amino acid responsible for the characteristic tingling sensation (paresthesia) many people experience from pre-workout supplements. It functions by increasing intramuscular carnosine concentrations, which buffers the accumulation of hydrogen ions during sustained high-intensity efforts. Research supports its use in activities lasting 60 to 240 seconds — anaerobic intervals, rowing, sprint-based sports — rather than shorter efforts or long aerobic work.

The tingling side effect is harmless but can be uncomfortable for some users. It diminishes with divided dosing (e.g., two smaller doses per day rather than one large pre-workout dose). Effective daily doses in the research literature are typically 3.2 to 6.4 grams. Lower doses common in mixed pre-workout products may produce the tingling without sufficient carnosine accumulation to affect performance.

L-citrulline and citrulline malate

L-citrulline is a precursor to arginine, which in turn supports nitric oxide production in the endothelium. Higher nitric oxide availability promotes vasodilation (widening of blood vessels), which may support muscular blood flow and the clearance of metabolic byproducts during exercise. Research suggests that L-citrulline at doses of 6 to 8 grams may improve resistance exercise performance and reduce post-exercise muscle soreness. The evidence for citrulline malate (a combination with malic acid) is comparable, though the optimal malate ratio is debated.

The "pump" sensation associated with citrulline reflects genuine vasodilation rather than a purely cosmetic effect. Vasodilation also produces a modest reduction in blood pressure — relevant if you are monitoring hs-CRP and cardiovascular markers as part of a performance health program.

Sodium bicarbonate

Sodium bicarbonate (baking soda) functions as an extracellular buffer for lactic acid, reducing the metabolic acidosis that limits performance in sustained high-intensity efforts. The evidence for performance improvement in sprint and combat sports is reasonably robust at doses around 0.2 to 0.3 grams per kilogram of body weight. It is not found in most commercial pre-workout products due to its gastrointestinal side effects — nausea and bloating are common — but it is worth understanding for athletes pursuing evidence-based supplementation.

What the evidence does not support

Several ingredients appear frequently in pre-workout labels without convincing support for their claimed effects at the doses used. These include: proprietary "focus blends" containing underdosed nootropics, synephrine (a stimulant with cardiovascular effects and limited performance data), and branched-chain amino acids (BCAAs) as an acute pre-workout ergogenic (their value is better understood in the context of overall protein intake across the day, not as a standalone pre-session supplement).

Which Biomarkers Are Relevant to Pre-workout Performance?

A pre-workout supplement can only optimize what is already a functional physiological system. If underlying deficiencies are limiting training capacity, no formula will compensate for them. These are the markers most relevant to performance readiness and recovery.

• Ferritin — Iron storage; low ferritin reduces oxygen delivery and training capacity
• Hemoglobin — Oxygen-carrying capacity; direct measure of aerobic substrate delivery
• Vitamin D — Muscle function, recovery, and immune resilience
• Vitamin B12 — Energy metabolism; deficiency contributes to fatigue and reduced power output
• Glucose / HbA1c — Blood sugar regulation; affects energy availability during training
• hs-CRP — Systemic inflammation; elevated hs-CRP may indicate insufficient recovery
• Total Testosterone — Anabolic hormone status; affects strength adaptation and recovery
• eGFR / Creatinine — Kidney function; relevant if using creatine supplementation long term

Superpower's Baseline Blood Panel includes ferritin, vitamin D, B12, HbA1c, fasting glucose, hemoglobin, and a comprehensive metabolic profile — covering the primary physiological constraints on training performance in a single blood draw.

When a Pre-workout Formula May Be Masking a Real Problem

Persistent fatigue, poor recovery, and limited training capacity are not always solved by choosing a better pre-workout product. When these symptoms are chronic, they may reflect low ferritin, suboptimal thyroid function, poor blood sugar regulation, or low testosterone — none of which a stimulant-based supplement will address and some of which it may temporarily obscure.

If your training performance has declined or plateaued despite adequate nutrition, sleep, and programming, a comprehensive biomarker panel provides more diagnostic information than experimenting with new supplement formulas. Understanding your baseline physiology is the starting point for identifying whether supplementation is additive or simply compensatory.