I remember reading this thread some months ago. At the time, I had only recently started uisng Toppik and wanted to wait a while to see my progress with hair growth in conjuction with minoxidil. Well, today, after about 6 months of consistent toppik and minoxidil use, I can confidently say that Toppik has not stunted any growth or "clogged" any pores to prevent absorption by minoxidil.
Over the past few weeks, I have noticed some good growth in the vertex region--a region that I CONSTANTLY have poured toppik onto at least once a day. Now, I will admit that Toppik is by no means a perfect product: it leaves a mess in the bathroom, it gets all over linens, and if you're not careful with it when applying, it can "paint" your scalp, making it somewha noticeable.
That all aside, Toppik has been a wonderful product for me for all the positives that you guys have read about. My regime usally consists of the following: take one capsule of Dutas Dustasteride; morning shower; apply Dr. lee's quick dry minoxidil; wait 15 minutes; apply spironolactone to hairline; get dressed/ready for work/day; apply toppik (somtimes using the 10 dollar maximizer they sell to help get a better look); come back from work/gym/wherever; take shower to wash out toppik; apply Dr. lee's quick dry minoxidil and spironolactone; get up and do the same thing.
Now, obviously, there are plenty of days where I have to break my routine--sometimes significantly (the past several weeks for example). there are many times where I just apply minoxidil to my scalp with the toppik still fully on--I've even gone to bed this way.
Why am I saying all this? Because my results this past week have shown, to me at least, that toppik is NOT preventative in hair growth. Is it a crutch? ABSOLUTELY. Do I anticipate relying on this product or any other concealer forever? No Freaking way. I guess the bottom line for me is to build up a solid base of hair growth (which seems to be happening) and start decreasing the amount of Toppik I use over time. Then, hopefully, over the next few years, something comes along that will end my reliance on all these products forever. (the latest update at the intercytex web site is VERY promising.)