I think supplements could add some benefit. I started bodybuilding about an year ago and currently take some supplements and vitamins that might help with my PE journey too. These include L-arginine and citrulline malate that both increase the flow of blood in veins. Gives a better pump at the gym so might as well work with PE exercises. Also taking zinc daily along with magnesium, this combination is known as “ZMA”. It should be taken before sleep and allegedly increases the growth hormone production in the body when you sleep thus helping build muscle cells.
I’m new to this too and just started with the newbie routine. Interested to see how things work out.