I would like to share my experiences after taking an L-arginine+citrulline supplement for 5 days now:
The recommended daily dose is 3426 mg (3 x 2 pills). In order to slowly get my body used to L-arginine, I only took half the recommended daily dose, i.e. 1713mg (3 x 1 pill) for the first three days.
On the first evening of taking it, I noticed that my penis was plumper and my testicles were hanging lower. Overall, my package looked more voluminous. The testicles hang relaxed and lower. On the second day the veins of the penis became more visible (I took photos of every day and i noticed that in particular). I also had multiple semi-erections on the second day. On the morning of the third day i woke up and was very excited. I literally woke up from the erection. Later in the morning I was still very horny and had sex with my partner. The orgasm was great and a huge relief. The load was thick, creamy, white and a lot (5-6 pumps).
I couldn't really tell that the erection was harder than usual. I don't really have a problem with having an erections. I just want my penis to get harder and the erection to last longer. Since my penis is relatively large (above erect penis is 5.16 in, mine is around 7in), it seems to be difficult for me to be really hard for a long time. Most of the time, when I'm not extremely excited, my penis is erect, but a bit wobbly. This is the main reason I take L-arginine. I want my erections to get stronger, my penis to be really hard and that strong erection to last for a longer time.
In the night from the third to the fourth day i woke up several times due to an erection.
On the fourth day I increased the dose to 2/3 of the recommended daily dose (2280mg arginine + citrulline). After increasing the dose and taking two pills in the morning instead of one pill, I felt a little dizzy for a few hours. But then that went away again.
On the fifth day I was very horny in the morning. My penis was very plump, erect, and meaty. My testicles are very plump and large. I couldn't hold back and had sex with my partner. we both delayed each other's orgasm for a long time. I had a lot of precum and I could literally squeeze it out. When we finally let each have an orgasm I shot out a huge load, several pumps of thick, creamy, white cum. A very big load for ejaculating two days earlier. The orgasm was so intense and long. really extraordinary.
In general, when my penis is flaccid, it looks bigger, plumper, the veins protrude clearly and the testicles hang down plump and relaxed. I really notice a difference here. Without taking L-Arginine I already have relatively large, plump, present testicles, but after five days of taking L-Arginine I see a positive effect on the presence of my testicles and penis.