Pharma grade is doses exactly and is always legit, UGL stuff can be faked or underdosed or the whole batch may be bunk at a particular time. It's cheap too.
Don't know about TUDCA but always check stuff on pubmed and see how effective they are for the purposes you're using them.
TUDCA:
https://www.sciencedirect.com/scienc...11393X05806599
Seems good!