Hi there! I’ll be traveling to Spain, France and Italy. Is there any customs problems with pheros on those countries? I can enter with them with no problems? Thanks!
Just put them in your checked in bags, and you will be fine. Have fun on your trip 
I spent 3 weeks in Italy, France, Germany and the Netherlands last month. I carried Ammo, a homebrew mix of TAA/Androstenol and a homebrew mix of Issey Miyake Summer/AE mone clone in 3 unmarked Sephora atomizers, placed in my checked bags. Nobody touched them or asked questions. My experience has been the same with USA flights. However if you wanta carry them on, you need to place them in a quart size clear plastic bag and remove it from your carry-on while going through security. If you get caught with unrevealed liquids, they’ll yell at you, might even take them away. My GF got nailed by TSA at Vegas for not using the clear plastic bag…