Does anyone know if ginseng, gingko or l arginine are good at improving erection quality and penis circulation? I had a blood test done and my test was higher than average but it was found that I had very low levels of vitamin d. I've been taking a vitamin d supplement for around 2 weeks now and at the start it felt like it was making a difference. Its sort of worn off now, and I'm back to my side effects of feeling bloated, having brain fog and feeling a lack of circulation to my penis. I need to know if any of these supplements could help me out potentially.