They are different things. Sermerolin is unmodified GRF having a half life of a few minutes which greatly reduces it's effectiveness. Mod GRF1-29 is a modified version which extends the half life to 30min making it far more effective.
They are different things. Sermerolin is unmodified GRF having a half life of a few minutes which greatly reduces it's effectiveness. Mod GRF1-29 is a modified version which extends the half life to 30min making it far more effective.