The effect can varies among ppl imo, ash took a week for me to manifest the effect, 3 days for L-theanine. You can consider combining them with other supplement too for more result. I usually took 3 weeks off all supplement and retake it later. But i advice to not rely on pills too much, just go speak in front of public, embarrass yourself more, make yourself feel the fear and anxiety even if it make you want to cry your eyes out, eventually your brain will go numb and you no longer panic when speaking to ppl anymore. Just step out of your comfort zone and keep moving forward, i mean it with my heart.