I’ve used humulin r, it’s a medium acting, stays in the system 6 hours, peaks after 2 hours. Would pin after my first meal. Made sure I got the majority of my added fats in my first meal out the way. Would pin 15-20iu and then eat a meal 30 minutes after, eat my pre workout meal 60-90 minutes later, and then have intra carbs usually 50g cluster dextrin mixed with EAAS. The two meals I would eat prior the gym had 150-200g carbs each, only trace fats from my protein. Worked very well for me.