I do think your ‘low self esteem’ comment is off base and disappointing. I have very high self esteem, as do most of the vegans I know. I don’t consider myself worth less than a cow, but I do consider a cow worth more than a convenient diet for myself. There are ways to live a long and fully healthy life as a vegan, although I do believe there is an off chance it will shorten my life simply due to lack of clear evidence/knowledge on the subject… particularly if I am not careful with my diet. That is a sacrifice I am willing to make for the countless animals that will not suffer and die for my direct consumption though. Supplements are no different than other dietary elements… you just have to be conscious of what you are eating.