The stuff I've been taking daily includes NAC, Alcar, Lutein, Zeaxanthin, Astaxanthin, Zinc, Vitamin C. I'm taking smallish doses and have taken those before and not had any issues.
A couple days ago I started taking vitamin K and K2, which I've taken before, creatine which was a very small dose, like 1/5 of the normal dose, and a day or so ago I took 150mg of pycnogenol which I have taken before but not all at the same serving in response to someone saying they noticed mental benefits from it. This morning I'm checking a forum and my nose started bleeding. Later this evening it started bleeding quite a bit. I figure it probably wasn't the first stuff I described, vitamin K doesn't sound like it would cause nose bleeds, but i'm pretty sure pycnogenol is like aspirin so maybe it thins the blood? Creatine could I guess but I only took a small dose.