How does l'Éternité Plus herbal tea work? Unlike caffeine, which "borrows" energy from your reserves, adaptogenic plants like Ashwagandha and Holy Basil help your system regulate its own stress. They act like a thermostat: if you're too low, they lift you up; if you're too stressed, they calm you down. The result? Stable energy, without the "crash" effect at the end of the day.