the 'yellowing' stuff I think is dependant on a few things... I don't think I know of anybody who's turned yellow who wasn't heavy into drinking and rec drugs.
even after months of tren and high drol, my bilirubin was high (1.7 or so, I forget), but my eyes were white as can be, and nails clear/normal and skin, although 'darker' (androgen-darker) never had a yellow tint... I always tell my gf's to tell me in they notice me either turning "blue/purple" or yellow, nobody's ever noticed a difference.