Trusting PCT sources

[autistAL]

I recently ordered an Aromotase inhibitor, isotretinoin and more to take as precautions alongside my cycle, however I can’t shake the thought in the back of my mind that is the validity of these substances. I completely understand and trust the sources I have for PED’s through collaboration of janoshik group testing and that whole system and the stack of evidence, if anyone can share and teach me how I trust these different sources I buy these pharmaceuticals from India and how to check their validity this would be much appreciated thanks to have more confidence behind my source?