Caffeine is one of the most researched performance ingredients in sports nutrition. Studies consistently show it can improve energy, focus, and training output. Research commonly uses around 3 to 6mg per kg of bodyweight, and it pairs especially well with L-Theanine.
What the research shows
Caffeine is well established as an ergogenic aid. It supports alertness and perceived energy, can make hard efforts feel easier, and is used across strength and endurance sport. This deep research base is why it sits at the core of almost every effective pre-workout.
How much the studies use
Research commonly uses roughly 3 to 6mg per kg of bodyweight, taken before exercise. For an 80kg person that is around 240 to 480mg, though individual tolerance varies widely. Keep your total daily intake within the roughly 400mg that the EFSA considers safe for most adults. See how much caffeine is in pre-workout.
The downside, and the fix
On its own, especially at high doses, caffeine can cause jitters and a crash. The research-backed fix is pairing it with L-Theanine, which smooths the energy into calm focus. Read caffeine and L-Theanine.
Timing and tolerance
- Take it 20 to 30 minutes before training.
- Avoid a high dose within 6 hours of sleep. See pre-workout and sleep.
- Cycle it to manage tolerance. See how to cycle pre-workout.
How PUROX uses caffeine
PUROX is built around strong but sensible caffeine, balanced with L-Theanine for clean, focused energy rather than a jittery spike and crash. It applies the science instead of just chasing the biggest number.
This article is for general educational purposes and summarises commonly reported research on individual ingredients. It is not medical advice. Dose ranges mentioned reflect amounts commonly used in research, not a statement of any specific product formula. PUROX is a food supplement and is not intended to diagnose, treat, cure, or prevent any disease. These statements have not been evaluated by the EFSA or FDA. Always follow the recommended serving. Not suitable for those sensitive to caffeine, pregnant or breastfeeding women, or anyone under 18. Consult a doctor before use if you have a medical condition or take medication.
