Zix either works or it doesn't, just like the big 3. The KEY is NOT to mess with the formula. Do not add anything additional to it. This has been shown time and time again to reduce the effectiveness of the formula. Even Joe, the inventor of Zix, has said this countless times.
My advice: use the standard formula and give it 6 months. If it doesn't help, move on.
My opinion on the best standard formula after YEARS on these sites: 3, 220 mg zinc sulphate capsules (yes, it has to be zinc sulphate), 3, 50 mg B6 (yes it has to be p-5-p B6) capsules or crushed tablets, and 120 ml of distilled water. If you want to add a little ethanol to this like Worm does, then go for it. Keep the mix in an opaque container--apparently sunlight can affect the B6.