Hi, sorry for taking so long to respond. I never tried TA-65 but know about it. I did try Product B but like with al products you have to take it for quite some time to maybe notice a difference. I just tried one bottle of Product B and didn't notice much change but that doesn't mean it does not work. I do know it is much cheaper than TA-65. They work in different ways also. Hope that helps.
Have no idea! It's not marked on the bottle I have. I took it for about 7 months & the only thing I noticed is that my fingernails grew stronger & faster. I quit, then my fingernails became more brittle again. I guess it's doing something, but wish I could substantiate it with lab work vs company promises.