How long is MCs Igf-1 good for?

Heys guys, I have a question about the stability of MCs Igf-1. I plan on using another cycle of it next week. I bought 3 bottles in April and have 1 left. Does this last bottle have the same potency as the first, even though its 4+ months old? I have read on other forums that after 3 months, the igf-1 starts to breakdown some. I have kept it in the refrigerator the entire time. Thanks.

since it's been in the fridge it should be fine, I've heard studies that say it last for years

i would say a year if kept cold bro