plain igf-1 lasts about 20mins in your body. igf-1 r3 lasts 12hours I believe. r3 is better. Go to the igf section and read the sticky on it, it should tell you what you need to know. IGF-1 Information Here!
Only thing to know about the sticky is you can buy igf-1 r3 in constituted form now a days. They have ways to keep it good, so that part is old and not updated yet in the sticky. Good luck researching.