Energy without a crash is the page's way of describing a non-stimulant approach to energy.
The formula contains no caffeine among its named ingredients, so there is no caffeine crash to speak of. Ginseng and maca are traditional botanicals associated with vitality, and research on both is limited and mixed.
The wording is about how the formula is designed, not about a measured result.
If you feel anything, it is likely to be gradual and subtle, as the testimonials suggest. Fatigue has many causes, including sleep, diet, stress, activity and medical conditions. If tiredness is persistent, see a doctor. Do not rely on a supplement to cover for a problem that needs attention.