I previously tried taking a n-acetylcysteine (NAC) supplement and found that it modestly helped with my ADHD symptoms. I don't remember whether it helped with procrastination specifically, or just with attention.

However, I stopped taking it until now, because when I was prescribed ADHD medication and when I took it alongside my ADHD medication, it seemed to make me very irritable. I now hypothesise this was because the combination of the medication and the NAC may have reduced my HDL cholesterol to dangerously low levels - though I don't know this for sure.

I am now on a different ADHD medication, guanfacine, which also reduces serum cholesterol, and I was also taking Athletic Greens AG-1, which contains vitamin B3, which also reduces serum cholesterol. And indeed when I did measure out AG-1 roughly instead of precisely, so that I took too much, I did indeed experience the irritability side-effect. So I think there's a risk that if I take NAC again, I will experience the same problem.

If I am unable to take NAC due to side-effects, this market will resolve as No.