Ok never had this happen with igf-1lr3 before. Started into my cycle doin 100mcg pwo, 50 per side. After 4 days I was having heart palpitations and running a 100 to 120 pulse rate sitting down. Its been a week and I'm back to normal. Pulse at 80 resting I feel 10 times better no palpitations. Any one have any take on this?