Is it ok to take a preworkout plus protein shakes plus amino acids plus multivitamins. distributed along the day and not at the same time. ?

Your nutrition plan: sounds fine but it would be best to see a nutritionist so that the plan can be tailor made to fit your needs. Many over the counter multivitamins are weak. A professional can tell you which brand is best in your local area. Look more for higher doses of each vitamin w/in the mulitvit rather than a longer list of ingredients. Peace and good health.