Yes of course! Preliminary training supplements are formulated with a specific goal: to give you extra energy or stamina so that you can attack your workout with focus and purpose. Other additions are formulated to achieve other, equally specific goals.
For example, if you do not get enough protein in your diet, all the preliminary workouts in the world will not help you see solid results. Eat it, and if you can't eat enough, practice after a workout or even near your workout.
On the flip side, if your pre-workout for choosing a little lower in some ingredients, like many of them, it's ok to soup with a little added. Here are some tips:
- Beta Alanine: This ingredient needs to be taken almost daily in order to work effectively, so getting an extra 3 grams outside of your pre-workout does not require much effort.
- Creatine: Like beta alanine, creatine should be taken daily to provide muscle recovery and other benefits.
- Nitric oxide boosters: Some companies produce non-stimulating “pumping” blends that can be stacked using pre-treated caffeine or a caffeinated energy drink.
If you are taking a preliminary caffeinated workout, just be careful not to take other stimulants on top of it. The dose in most preliminary workouts is strong enough without additional caffeine!