I heard ghk-Cu was spicy so I mixed a 70mg vial w/ 7ml of BAC water, had to up-vial to a 10ml empty vial. 20 units translates to 2mg. tb and BPC are mixed to a ratio where a dialy dose is 10 units, mixture of GLOW is 40 units.
No burning, stinging, or ISR with this ratio for my RS, YMMV