Pre-Workout Supplement (With Caffeine)
Pre-exercise supplements combining caffeine with multiple ergogenic ingredients. Caffeine alone has strong evidence; combination products aim for synergistic effects with ingredients like citrulline and beta-alanine.
An ingredient with growing research
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Effects reported in research
Caffeine component improves strength, endurance, and focus (strong evidence)
Citrulline component may enhance blood flow and muscle pump
Beta-alanine component may improve fatigue resistance during high-intensity intervals
Dosage & timing
- Take 30–60 minutes before exercise.
- Check caffeine content; keep total daily caffeine under 400 mg.
Cautions
- •High individual variability in caffeine tolerance.
- •Afternoon/evening use disrupts sleep.
- •Consult a doctor for cardiovascular conditions, hypertension, pregnancy, or breastfeeding.
- •Monitor for caffeine dependence and withdrawal.
Supporting research
Caffeine ingestion improves muscular strength and power (meta-analysis)
Journal of the International Society of Sports Nutrition, 2018
Pooling RCTs, caffeine produced small but significant improvements in maximal strength and power. Effect sizes were modest and influenced by individual variation and tolerance.
Citrulline malate enhances athletic anaerobic performance and relieves muscle soreness
Journal of Strength and Conditioning Research, 2010
An RCT examining a single 8 g dose of citrulline malate during bench press to exhaustion in trained males. Versus placebo, repetitions increased by an average of 52.92%, post-exercise muscle soreness (DOMS) fell by 40%, and perceived fatigue was significantly lower. It demonstrates a single-dose pre-workout effect, but the design is short-term with a relatively small sample.
Effects of β-alanine supplementation on exercise performance: a meta-analysis
Amino Acids, 2012
β-alanine supplementation significantly improved exercise performance during high-intensity efforts lasting 1–4 minutes. Effects were most pronounced for 60–240 second exercise bouts. Mechanism: elevated muscle carnosine levels buffer hydrogen ion accumulation during exercise.
Similar supplements
Alpha-GPC (L-Alpha-Glycerylphosphorylcholine)
Confidence: ModerateL-Alpha-Glycerylphosphorylcholine (Alpha-GPC)
Alpha-GPC is a precursor to acetylcholine, a key neurotransmitter involved in brain and neuromuscular activation. Research suggests that pre-exercise supplementation may promote growth hormone secretion and improve muscular strength and power output. Studies also indicate potential benefits for cognitive function and focus.
Caffeine
Confidence: ModerateAnhydrous caffeine
A pre-workout staple. Alongside alertness and focus, it gives a small boost to strength, power and endurance. Tolerance builds with habitual use, so timing matters.
L-Theanine
Confidence: ModerateL-Theanine (green tea-derived amino acid)
An amino acid found in green tea, research suggests it increases alpha-wave activity to promote calm focus without sedation. Combined with caffeine, it may attenuate jitteriness and anxiety while preserving alertness. Evidence for standalone strength or performance benefits is limited; it is most studied as part of a caffeine stack.