this is my third time using it.
Using humulin-R
the two times before I've got about 2 weeks into using it and i put on too much fat, so I dropped it. Currently running it only on my leg days and it has been great so far.
Only two problems I've had using it were:
* staying awake after using it.
* trying to eat enough food/carbs: started to feel the symptoms of hypoglycemia twice
But I haven't had a problem with anything since i've been using it once a week.