I have been using DualGen-15 (NO PG) 6oz which is roughly 6 months worth (180ml). I split this into bottles adding TB500 3 x 5mg into 90ml of minoxidil incase of any adverse reactions. It works out at 5mg a month.
Saw gains within a month but think the best came at 3 months. No shedding just...
I have been using topical tb500 mixed with minoxidil and experienced some new hair growth its honestly quite remarkable.
I have been mixing in 10mg into 3 month supply of minoxidil
Heres a study
https://pubmed.ncbi.nlm.nih.gov/17947589/