NO YOU DON'T WANT TO USE FINA WHILE ON DECA.
If you are going to run fina to prevent hairloss, I'd suggest you not use nandrolone.
Nandroleone needs to interact with the 5-AR enzyme to reduce to DHN. Once nandrolone is reduced to DHN, it is a much less androgenic AAS and has a greatly reduced affect on the androgen receptors in the hair follicles. So by inhibiting nandrolone's reduction you are in affect, using a more androgenic compound and you will increase the likelihood of unwanted side effects.
So nandrolone + 5-AR enzyme = less androgenic AAS
test on the other hand interacts with the 5-AR enzyme to reduce to DHT - a more androgenic AAS with higher binding affinity to the hair follicles. This could accelerate MPB.
So, test + 5-AR enzyme = more androgenic AAS
Fina should be used only with this drugs that do not interact with the 5-AR enzyme at all or react with the 5-AR to reduce to a more androgenic AAS.
The simple solution is to get ride of the deca and replace it with EQ. EQ has almost not interactivity with the 5-AR and is much less androgenic than test to begin with.
I got this from my good man cashout.