Hey doc i have been taking adderial lately and i noticed the my penis got smaller and i don't know if it's because my blood flow or what can you help me out

It did not: get smaller. By the age of 16 your penis will neither get bigger nor smaller. Take care of your overall health and penis will take care of itself. Have a healthy diet, exercise 30 minutes/day, drink plenty of water, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Get HPV vaccine. Wish you good health!