Pre-workout supplements are dietary formulas designed to boost energy, endurance, and focus before exercise. They typically contain ingredients like caffeine, beta-alanine, creatine, and amino acids, which work together to enhance workout performance. 

These supplements provide a temporary energy boost by stimulating the nervous system (primarily through caffeine) and improving blood flow to muscles. Ingredients like beta-alanine help buffer acid in muscles, delaying fatigue during high-intensity workouts.

It is generally recommended to take pre-workout supplements 20 to 30 minutes before exercising. This timing allows the ingredients to start working effectively as you begin your workout.

Increased Energy Levels: The stimulants in pre-workout supplements help elevate energy levels, making it easier to engage in intense workouts. 

Improved Focus and Motivation: Ingredients like caffeine not only boost physical performance but also enhance mental clarity and motivation, allowing for more productive training sessions. 

Enhanced Endurance: Many pre-workout formulas are designed to delay the onset of fatigue, enabling individuals to train harder and longer. 

Better Blood Flow: Some ingredients promote vasodilation (widening of blood vessels), improving blood flow to muscles during workouts, which can enhance performance and recovery.

While pre-workout supplements can provide significant benefits, they may not be necessary for everyone. Individuals should consider their fitness goals, tolerance to stimulants, and overall diet before incorporating these products into their routine. Additionally, maintaining good hydration and a balanced diet is crucial for optimal performance.