Both Arginine and Citrulline improve blood flow, but do not necessarily make blood thinner. Both are commonly used as erection aids; speaking from personal experience in using both for about 15 years now, they absolutely do improve erection quality and stiffness! It is beyond noticeable at this point. I also get much fatter cock when I use them versus not during pumping. I need more trials to know for sure, but I don’t think I could ever give up these supplements for pumping because of the benefit of blood flow.
These supplements, mostly arginine, are reported to strengthen veins and capillaries, even if slightly. So does this supplement prevent capillary rupture, or encourage it because the blood flow is increased? Tricky business.
I’m of the mind that spots are not as “bad” as edema, and both are not as bad as bruising or major discoloration. I may be wrong, though.
Starting length, Spring 2003: bpel 6 3/8", bpfsl ~6 1/2", flaccid ~3-4" (never measured flaccid stretched or hanging flaccid; starting girth was probably ~5"-5 1/4")
Summer 2004: bpel 7 7/8", bpfsl 8 1/8", flaccid ~4", erect girth 5.3"
Spring 2018: bpel 7 1/4", bpfsl 7 5/8", erect girth 5 1/8"; Spring 2020: bpel 7 3/4", bpfsl 8", erect girth 5 3/8". Current - August 2023: bpel 7 3/4", bpfsl 8", erect girth mid shaft 5 1/4" (5 1/2" at base)