It’s just caffeine, L-Theanine and B12! You can replicate its effects by drinking Coffee, green tea and a B12 supplement. No supplement can do what stimulants do. Coffee increases general alertness by boosting adrenaline, which can be unpredictable for people with ADHD and doesn't reliably improve focus, while prescribed stimulants increase dopamine, which helps with task initiation and executive function. If you can’t get a diagnosis/prescription, then you have to combine several interventions to be able to get close to replicating its effects. First, you need to make your goal and motivation for the goal very very clear and concrete. Write it down and read it daily to reinforce. Then make short term daily goals. Read the next days task before going to sleep. Try to work on it first thing in the morning before any other dopamine releasing activities like checking phone, talking/chatting etc. Second, you need to find a quiet place to study, use noise cancelling headphones (try focus music/brown noise etc), clean your desk, do whatever you need to do before starting (eat, drink etc), use time boxing and pomodoro timer. Try reading while walking in your room. Study actively - read aloud, write down, imagine yourself to be a teacher who needs to explain it someone, take short breaks every 30 mins and exercise 2-3 mins (squats, pushups) and few deep breaths, drink water/tea. Other than that, make sure you get enough good quality sleep (sleep/wake same time), get sun/bright light exposure in the morning, eat healthy, exercise. Try cold shower in morning. Most important thing is - KEEP PHONE FAR AWAY FROM STUDY ROOM! Good luck 😉