Other than the toxic piss smell I've noticed one side effect:
My fingernail cuticles have receded by about 2 mm. I know, this is a wussy side effect but it may be a sign of a biotin deficiency which isn't such a wussy matter. My cuticles have always been much healthier before I started the 2-3 grams of ALA a day. I've been taking 1000mcg biotin for the last 2 weeks and I think it may be helping, but too early to tell.