I think your saying you have a 20 shot bottle @ 75mg per shot. That would be a small amount to use. I would sugest 75mg or one shot per day for 6-8wks. That would be about double what you have.
Or you could go every other day...or even mon,wed,fri....and you would still have enough for about 7 weeks. But i would get more if I could easily do so.