So the peptide hormone is formed in the rough endoplasm reticulum of our cell and then moves on to the Golgi apparatus. Inside the Golgi complex, the peptide hormone can basically be modified in some way or form. For example, we can add a sugar component onto the peptide hormone. Now, once we modify the peptide hormone, it travels into our bloodstream or into our lymph system. And because the bloodstream consists predominantly of water and because our peptide hormone is made from peptide, that means peptide hormones are water soluble. And that means they can easily dissolve inside the bloodstream and do not actually need to use any type of carrier protein.