l-carnitine cycling Should Cyclists Supplement with Carnitine? Carnitine: the claims and why

The studies that exist for berberine suggest that you will want to take it for at least 13 weeks, but I would recommend using it for even longer

The consequences of the At PFK5 regulation for the plastidial metabolism have been elegantly described by Okegawa [33], who demonstrated the role of TRX f and TRX-like 2/2-Cys for the regulation of both At PFK5 and fructose 1,6-bisphosphatase ( At FBPase)

Or how about argireline, matrixyl, dermaxyl, and what are known as copper peptides

None of that is disqualifying - it's just easier to ask during your consultation than to sort out afterward, and this article puts all of it in one place so you're not hunting for it