The supplement industry is full of proprietary blends, underdosed ingredients, and marketing hype. This guide cuts through the noise to explain which pre workout ingredients are backed by real science, what doses actually work, and what to avoid.

Evidence-Based Ingredients

L-Citrulline

Citrulline is the king of pump ingredients. It converts to L-arginine in the kidneys, boosting nitric oxide production and increasing blood flow to working muscles. The clinical dose is 6-10g of L-citrulline per serving. Citrulline malate (2:1 ratio) requires roughly double the dose to deliver the same amount of pure citrulline. Any product with less than 4g is likely underdosed.

Beta-Alanine

Beta-alanine buffers hydrogen ions in muscle tissue, delaying the burning sensation during high-rep sets. The clinical dose is 3.2g per day. It causes a harmless tingling sensation (paraesthesia) in many users. Research shows consistent daily use over 4+ weeks provides the most benefit.

Caffeine Anhydrous

Caffeine is the most well-researched performance enhancer available. It improves strength, endurance, and focus at doses of 3-6mg per kg of body weight. For a 75kg person, that is 225-450mg. Most pre workouts contain 150-350mg. Read our detailed caffeine guide for more.

Creatine Monohydrate

Creatine is arguably the most proven supplement in sports nutrition. It increases phosphocreatine stores, improving short-duration, high-intensity performance. The maintenance dose is 3-5g per day. Getting it through your pre workout is convenient but not essential — timing does not matter for creatine.

Alpha-GPC

Alpha-GPC supports acetylcholine production, which is crucial for muscle contraction and mind-muscle connection. Clinical doses range from 300-600mg. It is the most effective nootropic ingredient for acute training performance.

Common but Ineffective Ingredients

Watch out for ingredients that sound impressive but lack evidence at typical pre workout doses: BCAA in a pre workout context (eat protein instead), arginine (poor bioavailability — citrulline is superior), taurine at under 1g, and any vitamin or mineral at less than 50% of RDA.

Clinical Doses vs Proprietary Blends

What Is a Proprietary Blend?

A proprietary blend lists ingredients without individual doses, showing only the total blend weight. This allows manufacturers to include token amounts of expensive ingredients while leading consumers to believe the product is fully dosed. Our recommendation: always choose products with full label transparency.

Red Flags on Labels

Be wary of products that hide behind proprietary blends, list more than 15-20 ingredients (likely underdosing many), claim revolutionary ingredients without citations, or use phrases like “concentrated formula” to justify smaller servings. See our best pre workout UK rankings for products we have verified.