Glossary

Pre-Training Dose Window

Updated February 28, 2026

The pre-training dose window is the specific timeframe prior to physical exercise during which acute performance-enhancing supplements should be consumed to reach peak blood concentration during the workout.

In Unfair, tracking timing within this window is critical for compounds intended to maximize power output, endurance, or focus during training sessions.

Typical timing guidelines

The ideal pre-training window varies entirely by the compound's absorption rate.

• Stimulants (e.g., Caffeine): Typically 30 to 60 minutes before training.
• Nitric Oxide Precursors (e.g., L-Citrulline): Often 45 to 60 minutes prior.
• Fast-acting Carbohydrates: 15 to 30 minutes before, depending on the source.

Missing the optimal pre-training window can result in the supplement reaching peak efficacy after the workout has concluded, offering no performance benefit and potentially interfering with post-training processes like sleep onset latency if stimulants are involved.

Clinical safety note

Stacking multiple stimulants or high-dose vasodilators within a single pre-training window significantly increases the risk of acute adverse events. Monitor blood pressure, heart rate, and jitteriness carefully.