Pregnenolone Advice

Hi Everyone, first time posting so excuse the lack of acronyms etc.
looking for advice on reputable sources of pregnenolone in the UK(preferably)
to provide some basic background. 60+ yrs old, been training for 42 yrs, always trained natural with the exception of small doses Ephedrine which i have used for 30+ yrs, couple of yrs ago i had bi-lateral knee replacement due to arthritus & knee injury, since then saw a very noticable drop in energy levels, recovery etc etc, decided to go to GP, and get some blood tests done as i thought it might be a thyroid(runs in the family) or test issue, test results came back and GP said they were ok. i am no expert but the test seemed very low to me, anyways i decided to see if i can improve matters, i dont want to go down the TRT route just yet, so thought i might try pregnenolone & maybe DHEA. to hopefully improve my own levels. but i wanted advice on known good sources/companies in the UK, that have proven good quality products. can anybody advise me on this please?