humulin R is OTC in USA, humalog is script (or get it from canada). humulin R has a much longer active life of about 6-7 hours or more, where humalog is active 2 hours or so . i like humulin R better, it stimulates my hunger which i need to happen. plus you got like 2-3 feedings to boatload in carbs and cals.`
peak on log: .5-1 hr.....duration: 3-4 hr...onset: 15 minutes
peak on R: 2-3 hrs.....duration: 5-7 hr...onset .5-1hr
both have half life eliminations of up to 13 hrs.